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e1d50974bfc2f3c220fd7cf219e6145b005f5ae4
[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 * Add channel(s) and event(s) to newly registered apps
1114 * from lttng global UST domain.
1115 */
1116 update_ust_app(ust_cmd.sock);
1117
1118 ret = ust_app_register_done(ust_cmd.sock);
1119 if (ret < 0) {
1120 /*
1121 * If the registration is not possible, we simply
1122 * unregister the apps and continue
1123 */
1124 ust_app_unregister(ust_cmd.sock);
1125 } else {
1126 /*
1127 * We just need here to monitor the close of the UST
1128 * socket and poll set monitor those by default.
1129 */
1130 ret = lttng_poll_add(&events, ust_cmd.sock, 0);
1131 if (ret < 0) {
1132 goto error;
1133 }
1134
1135 DBG("Apps with sock %d added to poll set",
1136 ust_cmd.sock);
1137 }
1138
1139 break;
1140 }
1141 } else {
1142 /*
1143 * At this point, we know that a registered application made
1144 * the event at poll_wait.
1145 */
1146 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1147 /* Removing from the poll set */
1148 ret = lttng_poll_del(&events, pollfd);
1149 if (ret < 0) {
1150 goto error;
1151 }
1152
1153 /* Socket closed on remote end. */
1154 ust_app_unregister(pollfd);
1155 break;
1156 }
1157 }
1158 }
1159 }
1160
1161 error:
1162 DBG("Application communication apps dying");
1163 close(apps_cmd_pipe[0]);
1164 close(apps_cmd_pipe[1]);
1165
1166 lttng_poll_clean(&events);
1167
1168 rcu_thread_offline();
1169 rcu_unregister_thread();
1170 return NULL;
1171 }
1172
1173 /*
1174 * Dispatch request from the registration threads to the application
1175 * communication thread.
1176 */
1177 static void *thread_dispatch_ust_registration(void *data)
1178 {
1179 int ret;
1180 struct cds_wfq_node *node;
1181 struct ust_command *ust_cmd = NULL;
1182
1183 DBG("[thread] Dispatch UST command started");
1184
1185 while (!dispatch_thread_exit) {
1186 /* Atomically prepare the queue futex */
1187 futex_nto1_prepare(&ust_cmd_queue.futex);
1188
1189 do {
1190 /* Dequeue command for registration */
1191 node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue);
1192 if (node == NULL) {
1193 DBG("Woken up but nothing in the UST command queue");
1194 /* Continue thread execution */
1195 break;
1196 }
1197
1198 ust_cmd = caa_container_of(node, struct ust_command, node);
1199
1200 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1201 " gid:%d sock:%d name:%s (version %d.%d)",
1202 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1203 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1204 ust_cmd->sock, ust_cmd->reg_msg.name,
1205 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
1206 /*
1207 * Inform apps thread of the new application registration. This
1208 * call is blocking so we can be assured that the data will be read
1209 * at some point in time or wait to the end of the world :)
1210 */
1211 ret = write(apps_cmd_pipe[1], ust_cmd,
1212 sizeof(struct ust_command));
1213 if (ret < 0) {
1214 perror("write apps cmd pipe");
1215 if (errno == EBADF) {
1216 /*
1217 * We can't inform the application thread to process
1218 * registration. We will exit or else application
1219 * registration will not occur and tracing will never
1220 * start.
1221 */
1222 goto error;
1223 }
1224 }
1225 free(ust_cmd);
1226 } while (node != NULL);
1227
1228 /* Futex wait on queue. Blocking call on futex() */
1229 futex_nto1_wait(&ust_cmd_queue.futex);
1230 }
1231
1232 error:
1233 DBG("Dispatch thread dying");
1234 return NULL;
1235 }
1236
1237 /*
1238 * This thread manage application registration.
1239 */
1240 static void *thread_registration_apps(void *data)
1241 {
1242 int sock = 0, i, ret, pollfd;
1243 uint32_t revents, nb_fd;
1244 struct lttng_poll_event events;
1245 /*
1246 * Get allocated in this thread, enqueued to a global queue, dequeued and
1247 * freed in the manage apps thread.
1248 */
1249 struct ust_command *ust_cmd = NULL;
1250
1251 DBG("[thread] Manage application registration started");
1252
1253 ret = lttcomm_listen_unix_sock(apps_sock);
1254 if (ret < 0) {
1255 goto error;
1256 }
1257
1258 /*
1259 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1260 * more will be added to this poll set.
1261 */
1262 ret = create_thread_poll_set(&events, 2);
1263 if (ret < 0) {
1264 goto error;
1265 }
1266
1267 /* Add the application registration socket */
1268 ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP);
1269 if (ret < 0) {
1270 goto error;
1271 }
1272
1273 /* Notify all applications to register */
1274 ret = notify_ust_apps(1);
1275 if (ret < 0) {
1276 ERR("Failed to notify applications or create the wait shared memory.\n"
1277 "Execution continues but there might be problem for already\n"
1278 "running applications that wishes to register.");
1279 }
1280
1281 while (1) {
1282 DBG("Accepting application registration");
1283
1284 nb_fd = LTTNG_POLL_GETNB(&events);
1285
1286 /* Inifinite blocking call, waiting for transmission */
1287 ret = lttng_poll_wait(&events, -1);
1288 if (ret < 0) {
1289 goto error;
1290 }
1291
1292 for (i = 0; i < nb_fd; i++) {
1293 /* Fetch once the poll data */
1294 revents = LTTNG_POLL_GETEV(&events, i);
1295 pollfd = LTTNG_POLL_GETFD(&events, i);
1296
1297 /* Thread quit pipe has been closed. Killing thread. */
1298 ret = check_thread_quit_pipe(pollfd, revents);
1299 if (ret) {
1300 goto error;
1301 }
1302
1303 /* Event on the registration socket */
1304 if (pollfd == apps_sock) {
1305 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1306 ERR("Register apps socket poll error");
1307 goto error;
1308 } else if (revents & LPOLLIN) {
1309 sock = lttcomm_accept_unix_sock(apps_sock);
1310 if (sock < 0) {
1311 goto error;
1312 }
1313
1314 /* Create UST registration command for enqueuing */
1315 ust_cmd = zmalloc(sizeof(struct ust_command));
1316 if (ust_cmd == NULL) {
1317 perror("ust command zmalloc");
1318 goto error;
1319 }
1320
1321 /*
1322 * Using message-based transmissions to ensure we don't
1323 * have to deal with partially received messages.
1324 */
1325 ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg,
1326 sizeof(struct ust_register_msg));
1327 if (ret < 0 || ret < sizeof(struct ust_register_msg)) {
1328 if (ret < 0) {
1329 perror("lttcomm_recv_unix_sock register apps");
1330 } else {
1331 ERR("Wrong size received on apps register");
1332 }
1333 free(ust_cmd);
1334 close(sock);
1335 continue;
1336 }
1337
1338 ust_cmd->sock = sock;
1339
1340 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1341 " gid:%d sock:%d name:%s (version %d.%d)",
1342 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1343 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1344 ust_cmd->sock, ust_cmd->reg_msg.name,
1345 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
1346
1347 /*
1348 * Lock free enqueue the registration request. The red pill
1349 * has been taken! This apps will be part of the *system*.
1350 */
1351 cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node);
1352
1353 /*
1354 * Wake the registration queue futex. Implicit memory
1355 * barrier with the exchange in cds_wfq_enqueue.
1356 */
1357 futex_nto1_wake(&ust_cmd_queue.futex);
1358 }
1359 }
1360 }
1361 }
1362
1363 error:
1364 DBG("UST Registration thread dying");
1365
1366 /* Notify that the registration thread is gone */
1367 notify_ust_apps(0);
1368
1369 close(apps_sock);
1370 close(sock);
1371 unlink(apps_unix_sock_path);
1372
1373 lttng_poll_clean(&events);
1374
1375 return NULL;
1376 }
1377
1378 /*
1379 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
1380 * exec or it will fails.
1381 */
1382 static int spawn_consumer_thread(struct consumer_data *consumer_data)
1383 {
1384 int ret;
1385 struct timespec timeout;
1386
1387 timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT;
1388 timeout.tv_nsec = 0;
1389
1390 /* Setup semaphore */
1391 ret = sem_init(&consumer_data->sem, 0, 0);
1392 if (ret < 0) {
1393 PERROR("sem_init consumer semaphore");
1394 goto error;
1395 }
1396
1397 ret = pthread_create(&consumer_data->thread, NULL,
1398 thread_manage_consumer, consumer_data);
1399 if (ret != 0) {
1400 PERROR("pthread_create consumer");
1401 ret = -1;
1402 goto error;
1403 }
1404
1405 /* Get time for sem_timedwait absolute timeout */
1406 ret = clock_gettime(CLOCK_REALTIME, &timeout);
1407 if (ret < 0) {
1408 PERROR("clock_gettime spawn consumer");
1409 /* Infinite wait for the kconsumerd thread to be ready */
1410 ret = sem_wait(&consumer_data->sem);
1411 } else {
1412 /* Normal timeout if the gettime was successful */
1413 timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT;
1414 ret = sem_timedwait(&consumer_data->sem, &timeout);
1415 }
1416
1417 if (ret < 0) {
1418 if (errno == ETIMEDOUT) {
1419 /*
1420 * Call has timed out so we kill the kconsumerd_thread and return
1421 * an error.
1422 */
1423 ERR("The consumer thread was never ready. Killing it");
1424 ret = pthread_cancel(consumer_data->thread);
1425 if (ret < 0) {
1426 PERROR("pthread_cancel consumer thread");
1427 }
1428 } else {
1429 PERROR("semaphore wait failed consumer thread");
1430 }
1431 goto error;
1432 }
1433
1434 pthread_mutex_lock(&consumer_data->pid_mutex);
1435 if (consumer_data->pid == 0) {
1436 ERR("Kconsumerd did not start");
1437 pthread_mutex_unlock(&consumer_data->pid_mutex);
1438 goto error;
1439 }
1440 pthread_mutex_unlock(&consumer_data->pid_mutex);
1441
1442 return 0;
1443
1444 error:
1445 return ret;
1446 }
1447
1448 /*
1449 * Join consumer thread
1450 */
1451 static int join_consumer_thread(struct consumer_data *consumer_data)
1452 {
1453 void *status;
1454 int ret;
1455
1456 if (consumer_data->pid != 0) {
1457 ret = kill(consumer_data->pid, SIGTERM);
1458 if (ret) {
1459 ERR("Error killing consumer daemon");
1460 return ret;
1461 }
1462 return pthread_join(consumer_data->thread, &status);
1463 } else {
1464 return 0;
1465 }
1466 }
1467
1468 /*
1469 * Fork and exec a consumer daemon (consumerd).
1470 *
1471 * Return pid if successful else -1.
1472 */
1473 static pid_t spawn_consumerd(struct consumer_data *consumer_data)
1474 {
1475 int ret;
1476 pid_t pid;
1477 const char *consumer_to_use;
1478 const char *verbosity;
1479 struct stat st;
1480
1481 DBG("Spawning consumerd");
1482
1483 pid = fork();
1484 if (pid == 0) {
1485 /*
1486 * Exec consumerd.
1487 */
1488 if (opt_verbose_consumer) {
1489 verbosity = "--verbose";
1490 } else {
1491 verbosity = "--quiet";
1492 }
1493 switch (consumer_data->type) {
1494 case LTTNG_CONSUMER_KERNEL:
1495 /*
1496 * Find out which consumerd to execute. We will first try the
1497 * 64-bit path, then the sessiond's installation directory, and
1498 * fallback on the 32-bit one,
1499 */
1500 DBG3("Looking for a kernel consumer at these locations:");
1501 DBG3(" 1) %s", consumerd64_bin);
1502 DBG3(" 2) %s/%s", INSTALL_BIN_PATH, CONSUMERD_FILE);
1503 DBG3(" 3) %s", consumerd32_bin);
1504 if (stat(consumerd64_bin, &st) == 0) {
1505 DBG3("Found location #1");
1506 consumer_to_use = consumerd64_bin;
1507 } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) {
1508 DBG3("Found location #2");
1509 consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
1510 } else if (stat(consumerd32_bin, &st) == 0) {
1511 DBG3("Found location #3");
1512 consumer_to_use = consumerd32_bin;
1513 } else {
1514 DBG("Could not find any valid consumerd executable");
1515 break;
1516 }
1517 DBG("Using kernel consumer at: %s", consumer_to_use);
1518 execl(consumer_to_use,
1519 "lttng-consumerd", verbosity, "-k",
1520 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1521 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1522 NULL);
1523 break;
1524 case LTTNG_CONSUMER64_UST:
1525 {
1526 char *tmpnew = NULL;
1527
1528 if (consumerd64_libdir[0] != '\0') {
1529 char *tmp;
1530 size_t tmplen;
1531
1532 tmp = getenv("LD_LIBRARY_PATH");
1533 if (!tmp) {
1534 tmp = "";
1535 }
1536 tmplen = strlen("LD_LIBRARY_PATH=")
1537 + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp);
1538 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1539 if (!tmpnew) {
1540 ret = -ENOMEM;
1541 goto error;
1542 }
1543 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1544 strcat(tmpnew, consumerd64_libdir);
1545 if (tmp[0] != '\0') {
1546 strcat(tmpnew, ":");
1547 strcat(tmpnew, tmp);
1548 }
1549 ret = putenv(tmpnew);
1550 if (ret) {
1551 ret = -errno;
1552 goto error;
1553 }
1554 }
1555 DBG("Using 64-bit UST consumer at: %s", consumerd64_bin);
1556 ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u",
1557 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1558 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1559 NULL);
1560 if (consumerd64_libdir[0] != '\0') {
1561 free(tmpnew);
1562 }
1563 if (ret) {
1564 goto error;
1565 }
1566 break;
1567 }
1568 case LTTNG_CONSUMER32_UST:
1569 {
1570 char *tmpnew = NULL;
1571
1572 if (consumerd32_libdir[0] != '\0') {
1573 char *tmp;
1574 size_t tmplen;
1575
1576 tmp = getenv("LD_LIBRARY_PATH");
1577 if (!tmp) {
1578 tmp = "";
1579 }
1580 tmplen = strlen("LD_LIBRARY_PATH=")
1581 + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp);
1582 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1583 if (!tmpnew) {
1584 ret = -ENOMEM;
1585 goto error;
1586 }
1587 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1588 strcat(tmpnew, consumerd32_libdir);
1589 if (tmp[0] != '\0') {
1590 strcat(tmpnew, ":");
1591 strcat(tmpnew, tmp);
1592 }
1593 ret = putenv(tmpnew);
1594 if (ret) {
1595 ret = -errno;
1596 goto error;
1597 }
1598 }
1599 DBG("Using 32-bit UST consumer at: %s", consumerd32_bin);
1600 ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u",
1601 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1602 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1603 NULL);
1604 if (consumerd32_libdir[0] != '\0') {
1605 free(tmpnew);
1606 }
1607 if (ret) {
1608 goto error;
1609 }
1610 break;
1611 }
1612 default:
1613 perror("unknown consumer type");
1614 exit(EXIT_FAILURE);
1615 }
1616 if (errno != 0) {
1617 perror("kernel start consumer exec");
1618 }
1619 exit(EXIT_FAILURE);
1620 } else if (pid > 0) {
1621 ret = pid;
1622 } else {
1623 perror("start consumer fork");
1624 ret = -errno;
1625 }
1626 error:
1627 return ret;
1628 }
1629
1630 /*
1631 * Spawn the consumerd daemon and session daemon thread.
1632 */
1633 static int start_consumerd(struct consumer_data *consumer_data)
1634 {
1635 int ret;
1636
1637 pthread_mutex_lock(&consumer_data->pid_mutex);
1638 if (consumer_data->pid != 0) {
1639 pthread_mutex_unlock(&consumer_data->pid_mutex);
1640 goto end;
1641 }
1642
1643 ret = spawn_consumerd(consumer_data);
1644 if (ret < 0) {
1645 ERR("Spawning consumerd failed");
1646 pthread_mutex_unlock(&consumer_data->pid_mutex);
1647 goto error;
1648 }
1649
1650 /* Setting up the consumer_data pid */
1651 consumer_data->pid = ret;
1652 DBG2("Consumer pid %d", consumer_data->pid);
1653 pthread_mutex_unlock(&consumer_data->pid_mutex);
1654
1655 DBG2("Spawning consumer control thread");
1656 ret = spawn_consumer_thread(consumer_data);
1657 if (ret < 0) {
1658 ERR("Fatal error spawning consumer control thread");
1659 goto error;
1660 }
1661
1662 end:
1663 return 0;
1664
1665 error:
1666 return ret;
1667 }
1668
1669 /*
1670 * Check version of the lttng-modules.
1671 */
1672 static int validate_lttng_modules_version(void)
1673 {
1674 return kernel_validate_version(kernel_tracer_fd);
1675 }
1676
1677 /*
1678 * Setup necessary data for kernel tracer action.
1679 */
1680 static int init_kernel_tracer(void)
1681 {
1682 int ret;
1683
1684 /* Modprobe lttng kernel modules */
1685 ret = modprobe_lttng_control();
1686 if (ret < 0) {
1687 goto error;
1688 }
1689
1690 /* Open debugfs lttng */
1691 kernel_tracer_fd = open(module_proc_lttng, O_RDWR);
1692 if (kernel_tracer_fd < 0) {
1693 DBG("Failed to open %s", module_proc_lttng);
1694 ret = -1;
1695 goto error_open;
1696 }
1697
1698 /* Validate kernel version */
1699 ret = validate_lttng_modules_version();
1700 if (ret < 0) {
1701 goto error_version;
1702 }
1703
1704 ret = modprobe_lttng_data();
1705 if (ret < 0) {
1706 goto error_modules;
1707 }
1708
1709 DBG("Kernel tracer fd %d", kernel_tracer_fd);
1710 return 0;
1711
1712 error_version:
1713 modprobe_remove_lttng_control();
1714 close(kernel_tracer_fd);
1715 kernel_tracer_fd = 0;
1716 return LTTCOMM_KERN_VERSION;
1717
1718 error_modules:
1719 close(kernel_tracer_fd);
1720
1721 error_open:
1722 modprobe_remove_lttng_control();
1723
1724 error:
1725 WARN("No kernel tracer available");
1726 kernel_tracer_fd = 0;
1727 return LTTCOMM_KERN_NA;
1728 }
1729
1730 /*
1731 * Init tracing by creating trace directory and sending fds kernel consumer.
1732 */
1733 static int init_kernel_tracing(struct ltt_kernel_session *session)
1734 {
1735 int ret = 0;
1736
1737 if (session->consumer_fds_sent == 0) {
1738 /*
1739 * Assign default kernel consumer socket if no consumer assigned to the
1740 * kernel session. At this point, it's NOT suppose to be 0 but this is
1741 * an extra security check.
1742 */
1743 if (session->consumer_fd == 0) {
1744 session->consumer_fd = kconsumer_data.cmd_sock;
1745 }
1746
1747 ret = send_kconsumer_session_streams(&kconsumer_data, session);
1748 if (ret < 0) {
1749 ret = LTTCOMM_KERN_CONSUMER_FAIL;
1750 goto error;
1751 }
1752
1753 session->consumer_fds_sent = 1;
1754 }
1755
1756 error:
1757 return ret;
1758 }
1759
1760 /*
1761 * Create an UST session and add it to the session ust list.
1762 */
1763 static int create_ust_session(struct ltt_session *session,
1764 struct lttng_domain *domain)
1765 {
1766 struct ltt_ust_session *lus = NULL;
1767 int ret;
1768
1769 switch (domain->type) {
1770 case LTTNG_DOMAIN_UST:
1771 break;
1772 default:
1773 ret = LTTCOMM_UNKNOWN_DOMAIN;
1774 goto error;
1775 }
1776
1777 DBG("Creating UST session");
1778
1779 lus = trace_ust_create_session(session->path, session->id, domain);
1780 if (lus == NULL) {
1781 ret = LTTCOMM_UST_SESS_FAIL;
1782 goto error;
1783 }
1784
1785 ret = run_as_mkdir_recursive(lus->pathname, S_IRWXU | S_IRWXG,
1786 session->uid, session->gid);
1787 if (ret < 0) {
1788 if (ret != -EEXIST) {
1789 ERR("Trace directory creation error");
1790 ret = LTTCOMM_UST_SESS_FAIL;
1791 goto error;
1792 }
1793 }
1794
1795 /* The domain type dictate different actions on session creation */
1796 switch (domain->type) {
1797 case LTTNG_DOMAIN_UST:
1798 /* No ustctl for the global UST domain */
1799 break;
1800 default:
1801 ERR("Unknown UST domain on create session %d", domain->type);
1802 goto error;
1803 }
1804 lus->uid = session->uid;
1805 lus->gid = session->gid;
1806 session->ust_session = lus;
1807
1808 return LTTCOMM_OK;
1809
1810 error:
1811 free(lus);
1812 return ret;
1813 }
1814
1815 /*
1816 * Create a kernel tracer session then create the default channel.
1817 */
1818 static int create_kernel_session(struct ltt_session *session)
1819 {
1820 int ret;
1821
1822 DBG("Creating kernel session");
1823
1824 ret = kernel_create_session(session, kernel_tracer_fd);
1825 if (ret < 0) {
1826 ret = LTTCOMM_KERN_SESS_FAIL;
1827 goto error;
1828 }
1829
1830 /* Set kernel consumer socket fd */
1831 if (kconsumer_data.cmd_sock) {
1832 session->kernel_session->consumer_fd = kconsumer_data.cmd_sock;
1833 }
1834
1835 ret = run_as_mkdir_recursive(session->kernel_session->trace_path,
1836 S_IRWXU | S_IRWXG, session->uid, session->gid);
1837 if (ret < 0) {
1838 if (ret != -EEXIST) {
1839 ERR("Trace directory creation error");
1840 goto error;
1841 }
1842 }
1843 session->kernel_session->uid = session->uid;
1844 session->kernel_session->gid = session->gid;
1845
1846 error:
1847 return ret;
1848 }
1849
1850 /*
1851 * Check if the UID or GID match the session. Root user has access to all
1852 * sessions.
1853 */
1854 static int session_access_ok(struct ltt_session *session, uid_t uid, gid_t gid)
1855 {
1856 if (uid != session->uid && gid != session->gid && uid != 0) {
1857 return 0;
1858 } else {
1859 return 1;
1860 }
1861 }
1862
1863 static unsigned int lttng_sessions_count(uid_t uid, gid_t gid)
1864 {
1865 unsigned int i = 0;
1866 struct ltt_session *session;
1867
1868 DBG("Counting number of available session for UID %d GID %d",
1869 uid, gid);
1870 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
1871 /*
1872 * Only list the sessions the user can control.
1873 */
1874 if (!session_access_ok(session, uid, gid)) {
1875 continue;
1876 }
1877 i++;
1878 }
1879 return i;
1880 }
1881
1882 /*
1883 * Using the session list, filled a lttng_session array to send back to the
1884 * client for session listing.
1885 *
1886 * The session list lock MUST be acquired before calling this function. Use
1887 * session_lock_list() and session_unlock_list().
1888 */
1889 static void list_lttng_sessions(struct lttng_session *sessions, uid_t uid,
1890 gid_t gid)
1891 {
1892 unsigned int i = 0;
1893 struct ltt_session *session;
1894
1895 DBG("Getting all available session for UID %d GID %d",
1896 uid, gid);
1897 /*
1898 * Iterate over session list and append data after the control struct in
1899 * the buffer.
1900 */
1901 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
1902 /*
1903 * Only list the sessions the user can control.
1904 */
1905 if (!session_access_ok(session, uid, gid)) {
1906 continue;
1907 }
1908 strncpy(sessions[i].path, session->path, PATH_MAX);
1909 sessions[i].path[PATH_MAX - 1] = '\0';
1910 strncpy(sessions[i].name, session->name, NAME_MAX);
1911 sessions[i].name[NAME_MAX - 1] = '\0';
1912 sessions[i].enabled = session->enabled;
1913 i++;
1914 }
1915 }
1916
1917 /*
1918 * Fill lttng_channel array of all channels.
1919 */
1920 static void list_lttng_channels(int domain, struct ltt_session *session,
1921 struct lttng_channel *channels)
1922 {
1923 int i = 0;
1924 struct ltt_kernel_channel *kchan;
1925
1926 DBG("Listing channels for session %s", session->name);
1927
1928 switch (domain) {
1929 case LTTNG_DOMAIN_KERNEL:
1930 /* Kernel channels */
1931 if (session->kernel_session != NULL) {
1932 cds_list_for_each_entry(kchan,
1933 &session->kernel_session->channel_list.head, list) {
1934 /* Copy lttng_channel struct to array */
1935 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
1936 channels[i].enabled = kchan->enabled;
1937 i++;
1938 }
1939 }
1940 break;
1941 case LTTNG_DOMAIN_UST:
1942 {
1943 struct lttng_ht_iter iter;
1944 struct ltt_ust_channel *uchan;
1945
1946 cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht,
1947 &iter.iter, uchan, node.node) {
1948 strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN);
1949 channels[i].attr.overwrite = uchan->attr.overwrite;
1950 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
1951 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
1952 channels[i].attr.switch_timer_interval =
1953 uchan->attr.switch_timer_interval;
1954 channels[i].attr.read_timer_interval =
1955 uchan->attr.read_timer_interval;
1956 channels[i].enabled = uchan->enabled;
1957 switch (uchan->attr.output) {
1958 case LTTNG_UST_MMAP:
1959 default:
1960 channels[i].attr.output = LTTNG_EVENT_MMAP;
1961 break;
1962 }
1963 i++;
1964 }
1965 break;
1966 }
1967 default:
1968 break;
1969 }
1970 }
1971
1972 /*
1973 * Create a list of ust global domain events.
1974 */
1975 static int list_lttng_ust_global_events(char *channel_name,
1976 struct ltt_ust_domain_global *ust_global, struct lttng_event **events)
1977 {
1978 int i = 0, ret = 0;
1979 unsigned int nb_event = 0;
1980 struct lttng_ht_iter iter;
1981 struct lttng_ht_node_str *node;
1982 struct ltt_ust_channel *uchan;
1983 struct ltt_ust_event *uevent;
1984 struct lttng_event *tmp;
1985
1986 DBG("Listing UST global events for channel %s", channel_name);
1987
1988 rcu_read_lock();
1989
1990 lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter);
1991 node = lttng_ht_iter_get_node_str(&iter);
1992 if (node == NULL) {
1993 ret = -LTTCOMM_UST_CHAN_NOT_FOUND;
1994 goto error;
1995 }
1996
1997 uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node);
1998
1999 nb_event += lttng_ht_get_count(uchan->events);
2000
2001 if (nb_event == 0) {
2002 ret = nb_event;
2003 goto error;
2004 }
2005
2006 DBG3("Listing UST global %d events", nb_event);
2007
2008 tmp = zmalloc(nb_event * sizeof(struct lttng_event));
2009 if (tmp == NULL) {
2010 ret = -LTTCOMM_FATAL;
2011 goto error;
2012 }
2013
2014 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
2015 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
2016 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2017 tmp[i].enabled = uevent->enabled;
2018 switch (uevent->attr.instrumentation) {
2019 case LTTNG_UST_TRACEPOINT:
2020 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
2021 break;
2022 case LTTNG_UST_PROBE:
2023 tmp[i].type = LTTNG_EVENT_PROBE;
2024 break;
2025 case LTTNG_UST_FUNCTION:
2026 tmp[i].type = LTTNG_EVENT_FUNCTION;
2027 break;
2028 case LTTNG_UST_TRACEPOINT_LOGLEVEL:
2029 tmp[i].type = LTTNG_EVENT_TRACEPOINT_LOGLEVEL;
2030 break;
2031 }
2032 i++;
2033 }
2034
2035 ret = nb_event;
2036 *events = tmp;
2037
2038 error:
2039 rcu_read_unlock();
2040 return ret;
2041 }
2042
2043 /*
2044 * Fill lttng_event array of all kernel events in the channel.
2045 */
2046 static int list_lttng_kernel_events(char *channel_name,
2047 struct ltt_kernel_session *kernel_session, struct lttng_event **events)
2048 {
2049 int i = 0, ret;
2050 unsigned int nb_event;
2051 struct ltt_kernel_event *event;
2052 struct ltt_kernel_channel *kchan;
2053
2054 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
2055 if (kchan == NULL) {
2056 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2057 goto error;
2058 }
2059
2060 nb_event = kchan->event_count;
2061
2062 DBG("Listing events for channel %s", kchan->channel->name);
2063
2064 if (nb_event == 0) {
2065 ret = nb_event;
2066 goto error;
2067 }
2068
2069 *events = zmalloc(nb_event * sizeof(struct lttng_event));
2070 if (*events == NULL) {
2071 ret = LTTCOMM_FATAL;
2072 goto error;
2073 }
2074
2075 /* Kernel channels */
2076 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
2077 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
2078 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2079 (*events)[i].enabled = event->enabled;
2080 switch (event->event->instrumentation) {
2081 case LTTNG_KERNEL_TRACEPOINT:
2082 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
2083 break;
2084 case LTTNG_KERNEL_KPROBE:
2085 case LTTNG_KERNEL_KRETPROBE:
2086 (*events)[i].type = LTTNG_EVENT_PROBE;
2087 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
2088 sizeof(struct lttng_kernel_kprobe));
2089 break;
2090 case LTTNG_KERNEL_FUNCTION:
2091 (*events)[i].type = LTTNG_EVENT_FUNCTION;
2092 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
2093 sizeof(struct lttng_kernel_function));
2094 break;
2095 case LTTNG_KERNEL_NOOP:
2096 (*events)[i].type = LTTNG_EVENT_NOOP;
2097 break;
2098 case LTTNG_KERNEL_SYSCALL:
2099 (*events)[i].type = LTTNG_EVENT_SYSCALL;
2100 break;
2101 case LTTNG_KERNEL_ALL:
2102 assert(0);
2103 break;
2104 }
2105 i++;
2106 }
2107
2108 return nb_event;
2109
2110 error:
2111 return ret;
2112 }
2113
2114 /*
2115 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
2116 */
2117 static int cmd_disable_channel(struct ltt_session *session,
2118 int domain, char *channel_name)
2119 {
2120 int ret;
2121 struct ltt_ust_session *usess;
2122
2123 usess = session->ust_session;
2124
2125 switch (domain) {
2126 case LTTNG_DOMAIN_KERNEL:
2127 {
2128 ret = channel_kernel_disable(session->kernel_session,
2129 channel_name);
2130 if (ret != LTTCOMM_OK) {
2131 goto error;
2132 }
2133
2134 kernel_wait_quiescent(kernel_tracer_fd);
2135 break;
2136 }
2137 case LTTNG_DOMAIN_UST:
2138 {
2139 struct ltt_ust_channel *uchan;
2140 struct lttng_ht *chan_ht;
2141
2142 chan_ht = usess->domain_global.channels;
2143
2144 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
2145 if (uchan == NULL) {
2146 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2147 goto error;
2148 }
2149
2150 ret = channel_ust_disable(usess, domain, uchan);
2151 if (ret != LTTCOMM_OK) {
2152 goto error;
2153 }
2154 break;
2155 }
2156 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2157 case LTTNG_DOMAIN_UST_EXEC_NAME:
2158 case LTTNG_DOMAIN_UST_PID:
2159 ret = LTTCOMM_NOT_IMPLEMENTED;
2160 goto error;
2161 default:
2162 ret = LTTCOMM_UNKNOWN_DOMAIN;
2163 goto error;
2164 }
2165
2166 ret = LTTCOMM_OK;
2167
2168 error:
2169 return ret;
2170 }
2171
2172 /*
2173 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
2174 */
2175 static int cmd_enable_channel(struct ltt_session *session,
2176 int domain, struct lttng_channel *attr)
2177 {
2178 int ret;
2179 struct ltt_ust_session *usess = session->ust_session;
2180 struct lttng_ht *chan_ht;
2181
2182 DBG("Enabling channel %s for session %s", attr->name, session->name);
2183
2184 switch (domain) {
2185 case LTTNG_DOMAIN_KERNEL:
2186 {
2187 struct ltt_kernel_channel *kchan;
2188
2189 kchan = trace_kernel_get_channel_by_name(attr->name,
2190 session->kernel_session);
2191 if (kchan == NULL) {
2192 ret = channel_kernel_create(session->kernel_session,
2193 attr, kernel_poll_pipe[1]);
2194 } else {
2195 ret = channel_kernel_enable(session->kernel_session, kchan);
2196 }
2197
2198 if (ret != LTTCOMM_OK) {
2199 goto error;
2200 }
2201
2202 kernel_wait_quiescent(kernel_tracer_fd);
2203 break;
2204 }
2205 case LTTNG_DOMAIN_UST:
2206 {
2207 struct ltt_ust_channel *uchan;
2208
2209 chan_ht = usess->domain_global.channels;
2210
2211 uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
2212 if (uchan == NULL) {
2213 ret = channel_ust_create(usess, domain, attr);
2214 } else {
2215 ret = channel_ust_enable(usess, domain, uchan);
2216 }
2217 break;
2218 }
2219 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2220 case LTTNG_DOMAIN_UST_EXEC_NAME:
2221 case LTTNG_DOMAIN_UST_PID:
2222 ret = LTTCOMM_NOT_IMPLEMENTED;
2223 goto error;
2224 default:
2225 ret = LTTCOMM_UNKNOWN_DOMAIN;
2226 goto error;
2227 }
2228
2229 error:
2230 return ret;
2231 }
2232
2233 /*
2234 * Command LTTNG_DISABLE_EVENT processed by the client thread.
2235 */
2236 static int cmd_disable_event(struct ltt_session *session, int domain,
2237 char *channel_name, char *event_name)
2238 {
2239 int ret;
2240
2241 switch (domain) {
2242 case LTTNG_DOMAIN_KERNEL:
2243 {
2244 struct ltt_kernel_channel *kchan;
2245 struct ltt_kernel_session *ksess;
2246
2247 ksess = session->kernel_session;
2248
2249 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
2250 if (kchan == NULL) {
2251 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2252 goto error;
2253 }
2254
2255 ret = event_kernel_disable_tracepoint(ksess, kchan, event_name);
2256 if (ret != LTTCOMM_OK) {
2257 goto error;
2258 }
2259
2260 kernel_wait_quiescent(kernel_tracer_fd);
2261 break;
2262 }
2263 case LTTNG_DOMAIN_UST:
2264 {
2265 struct ltt_ust_channel *uchan;
2266 struct ltt_ust_session *usess;
2267
2268 usess = session->ust_session;
2269
2270 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2271 channel_name);
2272 if (uchan == NULL) {
2273 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2274 goto error;
2275 }
2276
2277 ret = event_ust_disable_tracepoint(usess, domain, uchan, event_name);
2278 if (ret != LTTCOMM_OK) {
2279 goto error;
2280 }
2281
2282 DBG3("Disable UST event %s in channel %s completed", event_name,
2283 channel_name);
2284 break;
2285 }
2286 case LTTNG_DOMAIN_UST_EXEC_NAME:
2287 case LTTNG_DOMAIN_UST_PID:
2288 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2289 default:
2290 ret = LTTCOMM_NOT_IMPLEMENTED;
2291 goto error;
2292 }
2293
2294 ret = LTTCOMM_OK;
2295
2296 error:
2297 return ret;
2298 }
2299
2300 /*
2301 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
2302 */
2303 static int cmd_disable_event_all(struct ltt_session *session, int domain,
2304 char *channel_name)
2305 {
2306 int ret;
2307
2308 switch (domain) {
2309 case LTTNG_DOMAIN_KERNEL:
2310 {
2311 struct ltt_kernel_session *ksess;
2312 struct ltt_kernel_channel *kchan;
2313
2314 ksess = session->kernel_session;
2315
2316 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
2317 if (kchan == NULL) {
2318 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2319 goto error;
2320 }
2321
2322 ret = event_kernel_disable_all(ksess, kchan);
2323 if (ret != LTTCOMM_OK) {
2324 goto error;
2325 }
2326
2327 kernel_wait_quiescent(kernel_tracer_fd);
2328 break;
2329 }
2330 case LTTNG_DOMAIN_UST:
2331 {
2332 struct ltt_ust_session *usess;
2333 struct ltt_ust_channel *uchan;
2334
2335 usess = session->ust_session;
2336
2337 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2338 channel_name);
2339 if (uchan == NULL) {
2340 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2341 goto error;
2342 }
2343
2344 ret = event_ust_disable_all_tracepoints(usess, domain, uchan);
2345 if (ret != 0) {
2346 goto error;
2347 }
2348
2349 DBG3("Disable all UST events in channel %s completed", channel_name);
2350
2351 break;
2352 }
2353 case LTTNG_DOMAIN_UST_EXEC_NAME:
2354 case LTTNG_DOMAIN_UST_PID:
2355 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2356 default:
2357 ret = LTTCOMM_NOT_IMPLEMENTED;
2358 goto error;
2359 }
2360
2361 ret = LTTCOMM_OK;
2362
2363 error:
2364 return ret;
2365 }
2366
2367 /*
2368 * Command LTTNG_ADD_CONTEXT processed by the client thread.
2369 */
2370 static int cmd_add_context(struct ltt_session *session, int domain,
2371 char *channel_name, char *event_name, struct lttng_event_context *ctx)
2372 {
2373 int ret;
2374
2375 switch (domain) {
2376 case LTTNG_DOMAIN_KERNEL:
2377 /* Add kernel context to kernel tracer */
2378 ret = context_kernel_add(session->kernel_session, ctx,
2379 event_name, channel_name);
2380 if (ret != LTTCOMM_OK) {
2381 goto error;
2382 }
2383 break;
2384 case LTTNG_DOMAIN_UST:
2385 {
2386 struct ltt_ust_session *usess = session->ust_session;
2387
2388 ret = context_ust_add(usess, domain, ctx, event_name, channel_name);
2389 if (ret != LTTCOMM_OK) {
2390 goto error;
2391 }
2392 break;
2393 }
2394 case LTTNG_DOMAIN_UST_EXEC_NAME:
2395 case LTTNG_DOMAIN_UST_PID:
2396 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2397 default:
2398 ret = LTTCOMM_NOT_IMPLEMENTED;
2399 goto error;
2400 }
2401
2402 ret = LTTCOMM_OK;
2403
2404 error:
2405 return ret;
2406 }
2407
2408 /*
2409 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2410 *
2411 * TODO: currently, both events and loglevels are kept within the same
2412 * namespace for UST global registry/app registery, so if an event
2413 * happen to have the same name as the loglevel (very unlikely though),
2414 * and an attempt is made to enable/disable both in the same session,
2415 * the first to be created will be the only one allowed to exist.
2416 */
2417 static int cmd_enable_event(struct ltt_session *session, int domain,
2418 char *channel_name, struct lttng_event *event)
2419 {
2420 int ret;
2421 struct lttng_channel *attr;
2422 struct ltt_ust_session *usess = session->ust_session;
2423
2424 switch (domain) {
2425 case LTTNG_DOMAIN_KERNEL:
2426 {
2427 struct ltt_kernel_channel *kchan;
2428
2429 kchan = trace_kernel_get_channel_by_name(channel_name,
2430 session->kernel_session);
2431 if (kchan == NULL) {
2432 attr = channel_new_default_attr(domain);
2433 if (attr == NULL) {
2434 ret = LTTCOMM_FATAL;
2435 goto error;
2436 }
2437 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2438
2439 /* This call will notify the kernel thread */
2440 ret = channel_kernel_create(session->kernel_session,
2441 attr, kernel_poll_pipe[1]);
2442 if (ret != LTTCOMM_OK) {
2443 free(attr);
2444 goto error;
2445 }
2446 free(attr);
2447 }
2448
2449 /* Get the newly created kernel channel pointer */
2450 kchan = trace_kernel_get_channel_by_name(channel_name,
2451 session->kernel_session);
2452 if (kchan == NULL) {
2453 /* This sould not happen... */
2454 ret = LTTCOMM_FATAL;
2455 goto error;
2456 }
2457
2458 ret = event_kernel_enable_tracepoint(session->kernel_session, kchan,
2459 event);
2460 if (ret != LTTCOMM_OK) {
2461 goto error;
2462 }
2463
2464 kernel_wait_quiescent(kernel_tracer_fd);
2465 break;
2466 }
2467 case LTTNG_DOMAIN_UST:
2468 {
2469 struct lttng_channel *attr;
2470 struct ltt_ust_channel *uchan;
2471
2472 /* Get channel from global UST domain */
2473 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2474 channel_name);
2475 if (uchan == NULL) {
2476 /* Create default channel */
2477 attr = channel_new_default_attr(domain);
2478 if (attr == NULL) {
2479 ret = LTTCOMM_FATAL;
2480 goto error;
2481 }
2482 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2483 attr->name[NAME_MAX - 1] = '\0';
2484
2485 ret = channel_ust_create(usess, domain, attr);
2486 if (ret != LTTCOMM_OK) {
2487 free(attr);
2488 goto error;
2489 }
2490 free(attr);
2491
2492 /* Get the newly created channel reference back */
2493 uchan = trace_ust_find_channel_by_name(
2494 usess->domain_global.channels, channel_name);
2495 if (uchan == NULL) {
2496 /* Something is really wrong */
2497 ret = LTTCOMM_FATAL;
2498 goto error;
2499 }
2500 }
2501
2502 /* At this point, the session and channel exist on the tracer */
2503 ret = event_ust_enable_tracepoint(usess, domain, uchan, event);
2504 if (ret != LTTCOMM_OK) {
2505 goto error;
2506 }
2507 break;
2508 }
2509 case LTTNG_DOMAIN_UST_EXEC_NAME:
2510 case LTTNG_DOMAIN_UST_PID:
2511 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2512 default:
2513 ret = LTTCOMM_NOT_IMPLEMENTED;
2514 goto error;
2515 }
2516
2517 ret = LTTCOMM_OK;
2518
2519 error:
2520 return ret;
2521 }
2522
2523 /*
2524 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
2525 */
2526 static int cmd_enable_event_all(struct ltt_session *session, int domain,
2527 char *channel_name, int event_type)
2528 {
2529 int ret;
2530 struct ltt_kernel_channel *kchan;
2531
2532 switch (domain) {
2533 case LTTNG_DOMAIN_KERNEL:
2534 kchan = trace_kernel_get_channel_by_name(channel_name,
2535 session->kernel_session);
2536 if (kchan == NULL) {
2537 /* This call will notify the kernel thread */
2538 ret = channel_kernel_create(session->kernel_session, NULL,
2539 kernel_poll_pipe[1]);
2540 if (ret != LTTCOMM_OK) {
2541 goto error;
2542 }
2543
2544 /* Get the newly created kernel channel pointer */
2545 kchan = trace_kernel_get_channel_by_name(channel_name,
2546 session->kernel_session);
2547 if (kchan == NULL) {
2548 /* This sould not happen... */
2549 ret = LTTCOMM_FATAL;
2550 goto error;
2551 }
2552
2553 }
2554
2555 switch (event_type) {
2556 case LTTNG_EVENT_SYSCALL:
2557 ret = event_kernel_enable_all_syscalls(session->kernel_session,
2558 kchan, kernel_tracer_fd);
2559 break;
2560 case LTTNG_EVENT_TRACEPOINT:
2561 /*
2562 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
2563 * events already registered to the channel.
2564 */
2565 ret = event_kernel_enable_all_tracepoints(session->kernel_session,
2566 kchan, kernel_tracer_fd);
2567 break;
2568 case LTTNG_EVENT_ALL:
2569 /* Enable syscalls and tracepoints */
2570 ret = event_kernel_enable_all(session->kernel_session,
2571 kchan, kernel_tracer_fd);
2572 break;
2573 default:
2574 ret = LTTCOMM_KERN_ENABLE_FAIL;
2575 goto error;
2576 }
2577
2578 /* Manage return value */
2579 if (ret != LTTCOMM_OK) {
2580 goto error;
2581 }
2582
2583 kernel_wait_quiescent(kernel_tracer_fd);
2584 break;
2585 case LTTNG_DOMAIN_UST:
2586 {
2587 struct lttng_channel *attr;
2588 struct ltt_ust_channel *uchan;
2589 struct ltt_ust_session *usess = session->ust_session;
2590
2591 /* Get channel from global UST domain */
2592 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2593 channel_name);
2594 if (uchan == NULL) {
2595 /* Create default channel */
2596 attr = channel_new_default_attr(domain);
2597 if (attr == NULL) {
2598 ret = LTTCOMM_FATAL;
2599 goto error;
2600 }
2601 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2602 attr->name[NAME_MAX - 1] = '\0';
2603
2604 /* Use the internal command enable channel */
2605 ret = channel_ust_create(usess, domain, attr);
2606 if (ret != LTTCOMM_OK) {
2607 free(attr);
2608 goto error;
2609 }
2610 free(attr);
2611
2612 /* Get the newly created channel reference back */
2613 uchan = trace_ust_find_channel_by_name(
2614 usess->domain_global.channels, channel_name);
2615 if (uchan == NULL) {
2616 /* Something is really wrong */
2617 ret = LTTCOMM_FATAL;
2618 goto error;
2619 }
2620 }
2621
2622 /* At this point, the session and channel exist on the tracer */
2623
2624 switch (event_type) {
2625 case LTTNG_EVENT_ALL:
2626 case LTTNG_EVENT_TRACEPOINT:
2627 ret = event_ust_enable_all_tracepoints(usess, domain, uchan);
2628 if (ret != LTTCOMM_OK) {
2629 goto error;
2630 }
2631 break;
2632 default:
2633 ret = LTTCOMM_UST_ENABLE_FAIL;
2634 goto error;
2635 }
2636
2637 /* Manage return value */
2638 if (ret != LTTCOMM_OK) {
2639 goto error;
2640 }
2641
2642 break;
2643 }
2644 case LTTNG_DOMAIN_UST_EXEC_NAME:
2645 case LTTNG_DOMAIN_UST_PID:
2646 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2647 default:
2648 ret = LTTCOMM_NOT_IMPLEMENTED;
2649 goto error;
2650 }
2651
2652 ret = LTTCOMM_OK;
2653
2654 error:
2655 return ret;
2656 }
2657
2658 /*
2659 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2660 */
2661 static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
2662 {
2663 int ret;
2664 ssize_t nb_events = 0;
2665
2666 switch (domain) {
2667 case LTTNG_DOMAIN_KERNEL:
2668 nb_events = kernel_list_events(kernel_tracer_fd, events);
2669 if (nb_events < 0) {
2670 ret = LTTCOMM_KERN_LIST_FAIL;
2671 goto error;
2672 }
2673 break;
2674 case LTTNG_DOMAIN_UST:
2675 nb_events = ust_app_list_events(events);
2676 if (nb_events < 0) {
2677 ret = LTTCOMM_UST_LIST_FAIL;
2678 goto error;
2679 }
2680 break;
2681 default:
2682 ret = LTTCOMM_NOT_IMPLEMENTED;
2683 goto error;
2684 }
2685
2686 return nb_events;
2687
2688 error:
2689 /* Return negative value to differentiate return code */
2690 return -ret;
2691 }
2692
2693 /*
2694 * Command LTTNG_START_TRACE processed by the client thread.
2695 */
2696 static int cmd_start_trace(struct ltt_session *session)
2697 {
2698 int ret;
2699 struct ltt_kernel_session *ksession;
2700 struct ltt_ust_session *usess;
2701
2702 /* Short cut */
2703 ksession = session->kernel_session;
2704 usess = session->ust_session;
2705
2706 if (session->enabled) {
2707 ret = LTTCOMM_UST_START_FAIL;
2708 goto error;
2709 }
2710
2711 session->enabled = 1;
2712
2713 /* Kernel tracing */
2714 if (ksession != NULL) {
2715 struct ltt_kernel_channel *kchan;
2716
2717 /* Open kernel metadata */
2718 if (ksession->metadata == NULL) {
2719 ret = kernel_open_metadata(ksession, ksession->trace_path);
2720 if (ret < 0) {
2721 ret = LTTCOMM_KERN_META_FAIL;
2722 goto error;
2723 }
2724 }
2725
2726 /* Open kernel metadata stream */
2727 if (ksession->metadata_stream_fd == 0) {
2728 ret = kernel_open_metadata_stream(ksession);
2729 if (ret < 0) {
2730 ERR("Kernel create metadata stream failed");
2731 ret = LTTCOMM_KERN_STREAM_FAIL;
2732 goto error;
2733 }
2734 }
2735
2736 /* For each channel */
2737 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2738 if (kchan->stream_count == 0) {
2739 ret = kernel_open_channel_stream(kchan);
2740 if (ret < 0) {
2741 ret = LTTCOMM_KERN_STREAM_FAIL;
2742 goto error;
2743 }
2744 /* Update the stream global counter */
2745 ksession->stream_count_global += ret;
2746 }
2747 }
2748
2749 /* Setup kernel consumer socket and send fds to it */
2750 ret = init_kernel_tracing(ksession);
2751 if (ret < 0) {
2752 ret = LTTCOMM_KERN_START_FAIL;
2753 goto error;
2754 }
2755
2756 /* This start the kernel tracing */
2757 ret = kernel_start_session(ksession);
2758 if (ret < 0) {
2759 ret = LTTCOMM_KERN_START_FAIL;
2760 goto error;
2761 }
2762
2763 /* Quiescent wait after starting trace */
2764 kernel_wait_quiescent(kernel_tracer_fd);
2765 }
2766
2767 /* Flag session that trace should start automatically */
2768 if (usess) {
2769 usess->start_trace = 1;
2770
2771 ret = ust_app_start_trace_all(usess);
2772 if (ret < 0) {
2773 ret = LTTCOMM_UST_START_FAIL;
2774 goto error;
2775 }
2776 }
2777
2778 ret = LTTCOMM_OK;
2779
2780 error:
2781 return ret;
2782 }
2783
2784 /*
2785 * Command LTTNG_STOP_TRACE processed by the client thread.
2786 */
2787 static int cmd_stop_trace(struct ltt_session *session)
2788 {
2789 int ret;
2790 struct ltt_kernel_channel *kchan;
2791 struct ltt_kernel_session *ksession;
2792 struct ltt_ust_session *usess;
2793
2794 /* Short cut */
2795 ksession = session->kernel_session;
2796 usess = session->ust_session;
2797
2798 if (!session->enabled) {
2799 ret = LTTCOMM_UST_STOP_FAIL;
2800 goto error;
2801 }
2802
2803 session->enabled = 0;
2804
2805 /* Kernel tracer */
2806 if (ksession != NULL) {
2807 DBG("Stop kernel tracing");
2808
2809 /* Flush all buffers before stopping */
2810 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
2811 if (ret < 0) {
2812 ERR("Kernel metadata flush failed");
2813 }
2814
2815 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2816 ret = kernel_flush_buffer(kchan);
2817 if (ret < 0) {
2818 ERR("Kernel flush buffer error");
2819 }
2820 }
2821
2822 ret = kernel_stop_session(ksession);
2823 if (ret < 0) {
2824 ret = LTTCOMM_KERN_STOP_FAIL;
2825 goto error;
2826 }
2827
2828 kernel_wait_quiescent(kernel_tracer_fd);
2829 }
2830
2831 if (usess) {
2832 usess->start_trace = 0;
2833
2834 ret = ust_app_stop_trace_all(usess);
2835 if (ret < 0) {
2836 ret = LTTCOMM_UST_STOP_FAIL;
2837 goto error;
2838 }
2839 }
2840
2841 ret = LTTCOMM_OK;
2842
2843 error:
2844 return ret;
2845 }
2846
2847 /*
2848 * Command LTTNG_CREATE_SESSION processed by the client thread.
2849 */
2850 static int cmd_create_session(char *name, char *path, struct ucred *creds)
2851 {
2852 int ret;
2853
2854 ret = session_create(name, path, creds->uid, creds->gid);
2855 if (ret != LTTCOMM_OK) {
2856 goto error;
2857 }
2858
2859 ret = LTTCOMM_OK;
2860
2861 error:
2862 return ret;
2863 }
2864
2865 /*
2866 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2867 */
2868 static int cmd_destroy_session(struct ltt_session *session, char *name)
2869 {
2870 int ret;
2871
2872 /* Clean kernel session teardown */
2873 teardown_kernel_session(session);
2874 /* UST session teardown */
2875 teardown_ust_session(session);
2876
2877 /*
2878 * Must notify the kernel thread here to update it's poll setin order
2879 * to remove the channel(s)' fd just destroyed.
2880 */
2881 ret = notify_thread_pipe(kernel_poll_pipe[1]);
2882 if (ret < 0) {
2883 perror("write kernel poll pipe");
2884 }
2885
2886 ret = session_destroy(session);
2887
2888 return ret;
2889 }
2890
2891 /*
2892 * Command LTTNG_CALIBRATE processed by the client thread.
2893 */
2894 static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
2895 {
2896 int ret;
2897
2898 switch (domain) {
2899 case LTTNG_DOMAIN_KERNEL:
2900 {
2901 struct lttng_kernel_calibrate kcalibrate;
2902
2903 kcalibrate.type = calibrate->type;
2904 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
2905 if (ret < 0) {
2906 ret = LTTCOMM_KERN_ENABLE_FAIL;
2907 goto error;
2908 }
2909 break;
2910 }
2911 default:
2912 /* TODO: Userspace tracing */
2913 ret = LTTCOMM_NOT_IMPLEMENTED;
2914 goto error;
2915 }
2916
2917 ret = LTTCOMM_OK;
2918
2919 error:
2920 return ret;
2921 }
2922
2923 /*
2924 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2925 */
2926 static int cmd_register_consumer(struct ltt_session *session, int domain,
2927 char *sock_path)
2928 {
2929 int ret, sock;
2930
2931 switch (domain) {
2932 case LTTNG_DOMAIN_KERNEL:
2933 /* Can't register a consumer if there is already one */
2934 if (session->kernel_session->consumer_fds_sent != 0) {
2935 ret = LTTCOMM_KERN_CONSUMER_FAIL;
2936 goto error;
2937 }
2938
2939 sock = lttcomm_connect_unix_sock(sock_path);
2940 if (sock < 0) {
2941 ret = LTTCOMM_CONNECT_FAIL;
2942 goto error;
2943 }
2944
2945 session->kernel_session->consumer_fd = sock;
2946 break;
2947 default:
2948 /* TODO: Userspace tracing */
2949 ret = LTTCOMM_NOT_IMPLEMENTED;
2950 goto error;
2951 }
2952
2953 ret = LTTCOMM_OK;
2954
2955 error:
2956 return ret;
2957 }
2958
2959 /*
2960 * Command LTTNG_LIST_DOMAINS processed by the client thread.
2961 */
2962 static ssize_t cmd_list_domains(struct ltt_session *session,
2963 struct lttng_domain **domains)
2964 {
2965 int ret, index = 0;
2966 ssize_t nb_dom = 0;
2967
2968 if (session->kernel_session != NULL) {
2969 DBG3("Listing domains found kernel domain");
2970 nb_dom++;
2971 }
2972
2973 if (session->ust_session != NULL) {
2974 DBG3("Listing domains found UST global domain");
2975 nb_dom++;
2976 }
2977
2978 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
2979 if (*domains == NULL) {
2980 ret = -LTTCOMM_FATAL;
2981 goto error;
2982 }
2983
2984 if (session->kernel_session != NULL) {
2985 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
2986 index++;
2987 }
2988
2989 if (session->ust_session != NULL) {
2990 (*domains)[index].type = LTTNG_DOMAIN_UST;
2991 index++;
2992 }
2993
2994 return nb_dom;
2995
2996 error:
2997 return ret;
2998 }
2999
3000 /*
3001 * Command LTTNG_LIST_CHANNELS processed by the client thread.
3002 */
3003 static ssize_t cmd_list_channels(int domain, struct ltt_session *session,
3004 struct lttng_channel **channels)
3005 {
3006 int ret;
3007 ssize_t nb_chan = 0;
3008
3009 switch (domain) {
3010 case LTTNG_DOMAIN_KERNEL:
3011 if (session->kernel_session != NULL) {
3012 nb_chan = session->kernel_session->channel_count;
3013 }
3014 DBG3("Number of kernel channels %zd", nb_chan);
3015 break;
3016 case LTTNG_DOMAIN_UST:
3017 if (session->ust_session != NULL) {
3018 nb_chan = lttng_ht_get_count(
3019 session->ust_session->domain_global.channels);
3020 }
3021 DBG3("Number of UST global channels %zd", nb_chan);
3022 break;
3023 default:
3024 *channels = NULL;
3025 ret = -LTTCOMM_NOT_IMPLEMENTED;
3026 goto error;
3027 }
3028
3029 if (nb_chan > 0) {
3030 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
3031 if (*channels == NULL) {
3032 ret = -LTTCOMM_FATAL;
3033 goto error;
3034 }
3035
3036 list_lttng_channels(domain, session, *channels);
3037 } else {
3038 *channels = NULL;
3039 }
3040
3041 return nb_chan;
3042
3043 error:
3044 return ret;
3045 }
3046
3047 /*
3048 * Command LTTNG_LIST_EVENTS processed by the client thread.
3049 */
3050 static ssize_t cmd_list_events(int domain, struct ltt_session *session,
3051 char *channel_name, struct lttng_event **events)
3052 {
3053 int ret = 0;
3054 ssize_t nb_event = 0;
3055
3056 switch (domain) {
3057 case LTTNG_DOMAIN_KERNEL:
3058 if (session->kernel_session != NULL) {
3059 nb_event = list_lttng_kernel_events(channel_name,
3060 session->kernel_session, events);
3061 }
3062 break;
3063 case LTTNG_DOMAIN_UST:
3064 {
3065 if (session->ust_session != NULL) {
3066 nb_event = list_lttng_ust_global_events(channel_name,
3067 &session->ust_session->domain_global, events);
3068 }
3069 break;
3070 }
3071 default:
3072 ret = -LTTCOMM_NOT_IMPLEMENTED;
3073 goto error;
3074 }
3075
3076 ret = nb_event;
3077
3078 error:
3079 return ret;
3080 }
3081
3082 /*
3083 * Process the command requested by the lttng client within the command
3084 * context structure. This function make sure that the return structure (llm)
3085 * is set and ready for transmission before returning.
3086 *
3087 * Return any error encountered or 0 for success.
3088 */
3089 static int process_client_msg(struct command_ctx *cmd_ctx)
3090 {
3091 int ret = LTTCOMM_OK;
3092 int need_tracing_session = 1;
3093
3094 DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
3095
3096 if (opt_no_kernel && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) {
3097 ret = LTTCOMM_KERN_NA;
3098 goto error;
3099 }
3100
3101 /*
3102 * Check for command that don't needs to allocate a returned payload. We do
3103 * this here so we don't have to make the call for no payload at each
3104 * command.
3105 */
3106 switch(cmd_ctx->lsm->cmd_type) {
3107 case LTTNG_LIST_SESSIONS:
3108 case LTTNG_LIST_TRACEPOINTS:
3109 case LTTNG_LIST_DOMAINS:
3110 case LTTNG_LIST_CHANNELS:
3111 case LTTNG_LIST_EVENTS:
3112 break;
3113 default:
3114 /* Setup lttng message with no payload */
3115 ret = setup_lttng_msg(cmd_ctx, 0);
3116 if (ret < 0) {
3117 /* This label does not try to unlock the session */
3118 goto init_setup_error;
3119 }
3120 }
3121
3122 /* Commands that DO NOT need a session. */
3123 switch (cmd_ctx->lsm->cmd_type) {
3124 case LTTNG_CALIBRATE:
3125 case LTTNG_CREATE_SESSION:
3126 case LTTNG_LIST_SESSIONS:
3127 case LTTNG_LIST_TRACEPOINTS:
3128 need_tracing_session = 0;
3129 break;
3130 default:
3131 DBG("Getting session %s by name", cmd_ctx->lsm->session.name);
3132 session_lock_list();
3133 cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name);
3134 session_unlock_list();
3135 if (cmd_ctx->session == NULL) {
3136 if (cmd_ctx->lsm->session.name != NULL) {
3137 ret = LTTCOMM_SESS_NOT_FOUND;
3138 } else {
3139 /* If no session name specified */
3140 ret = LTTCOMM_SELECT_SESS;
3141 }
3142 goto error;
3143 } else {
3144 /* Acquire lock for the session */
3145 session_lock(cmd_ctx->session);
3146 }
3147 break;
3148 }
3149
3150 /*
3151 * Check domain type for specific "pre-action".
3152 */
3153 switch (cmd_ctx->lsm->domain.type) {
3154 case LTTNG_DOMAIN_KERNEL:
3155 if (!is_root) {
3156 ret = LTTCOMM_KERN_NA;
3157 goto error;
3158 }
3159
3160 /* Kernel tracer check */
3161 if (kernel_tracer_fd == 0) {
3162 /* Basically, load kernel tracer modules */
3163 ret = init_kernel_tracer();
3164 if (ret != 0) {
3165 goto error;
3166 }
3167 }
3168
3169 /* Need a session for kernel command */
3170 if (need_tracing_session) {
3171 if (cmd_ctx->session->kernel_session == NULL) {
3172 ret = create_kernel_session(cmd_ctx->session);
3173 if (ret < 0) {
3174 ret = LTTCOMM_KERN_SESS_FAIL;
3175 goto error;
3176 }
3177 }
3178
3179 /* Start the kernel consumer daemon */
3180 pthread_mutex_lock(&kconsumer_data.pid_mutex);
3181 if (kconsumer_data.pid == 0 &&
3182 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3183 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
3184 ret = start_consumerd(&kconsumer_data);
3185 if (ret < 0) {
3186 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3187 goto error;
3188 }
3189 } else {
3190 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
3191 }
3192 }
3193 break;
3194 case LTTNG_DOMAIN_UST:
3195 {
3196 if (need_tracing_session) {
3197 if (cmd_ctx->session->ust_session == NULL) {
3198 ret = create_ust_session(cmd_ctx->session,
3199 &cmd_ctx->lsm->domain);
3200 if (ret != LTTCOMM_OK) {
3201 goto error;
3202 }
3203 }
3204 /* Start the UST consumer daemons */
3205 /* 64-bit */
3206 pthread_mutex_lock(&ustconsumer64_data.pid_mutex);
3207 if (consumerd64_bin[0] != '\0' &&
3208 ustconsumer64_data.pid == 0 &&
3209 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3210 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3211 ret = start_consumerd(&ustconsumer64_data);
3212 if (ret < 0) {
3213 ret = LTTCOMM_UST_CONSUMER64_FAIL;
3214 ust_consumerd64_fd = -EINVAL;
3215 goto error;
3216 }
3217
3218 ust_consumerd64_fd = ustconsumer64_data.cmd_sock;
3219 } else {
3220 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3221 }
3222 /* 32-bit */
3223 if (consumerd32_bin[0] != '\0' &&
3224 ustconsumer32_data.pid == 0 &&
3225 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3226 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
3227 ret = start_consumerd(&ustconsumer32_data);
3228 if (ret < 0) {
3229 ret = LTTCOMM_UST_CONSUMER32_FAIL;
3230 ust_consumerd32_fd = -EINVAL;
3231 goto error;
3232 }
3233 ust_consumerd32_fd = ustconsumer32_data.cmd_sock;
3234 } else {
3235 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
3236 }
3237 }
3238 break;
3239 }
3240 default:
3241 break;
3242 }
3243
3244 /*
3245 * Check that the UID or GID match that of the tracing session.
3246 * The root user can interact with all sessions.
3247 */
3248 if (need_tracing_session) {
3249 if (!session_access_ok(cmd_ctx->session,
3250 cmd_ctx->creds.uid, cmd_ctx->creds.gid)) {
3251 ret = LTTCOMM_EPERM;
3252 goto error;
3253 }
3254 }
3255
3256 /* Process by command type */
3257 switch (cmd_ctx->lsm->cmd_type) {
3258 case LTTNG_ADD_CONTEXT:
3259 {
3260 ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3261 cmd_ctx->lsm->u.context.channel_name,
3262 cmd_ctx->lsm->u.context.event_name,
3263 &cmd_ctx->lsm->u.context.ctx);
3264 break;
3265 }
3266 case LTTNG_DISABLE_CHANNEL:
3267 {
3268 ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3269 cmd_ctx->lsm->u.disable.channel_name);
3270 break;
3271 }
3272 case LTTNG_DISABLE_EVENT:
3273 {
3274 ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3275 cmd_ctx->lsm->u.disable.channel_name,
3276 cmd_ctx->lsm->u.disable.name);
3277 ret = LTTCOMM_OK;
3278 break;
3279 }
3280 case LTTNG_DISABLE_ALL_EVENT:
3281 {
3282 DBG("Disabling all events");
3283
3284 ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3285 cmd_ctx->lsm->u.disable.channel_name);
3286 break;
3287 }
3288 case LTTNG_ENABLE_CHANNEL:
3289 {
3290 ret = cmd_enable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3291 &cmd_ctx->lsm->u.channel.chan);
3292 break;
3293 }
3294 case LTTNG_ENABLE_EVENT:
3295 {
3296 ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3297 cmd_ctx->lsm->u.enable.channel_name,
3298 &cmd_ctx->lsm->u.enable.event);
3299 break;
3300 }
3301 case LTTNG_ENABLE_ALL_EVENT:
3302 {
3303 DBG("Enabling all events");
3304
3305 ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3306 cmd_ctx->lsm->u.enable.channel_name,
3307 cmd_ctx->lsm->u.enable.event.type);
3308 break;
3309 }
3310 case LTTNG_LIST_TRACEPOINTS:
3311 {
3312 struct lttng_event *events;
3313 ssize_t nb_events;
3314
3315 nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events);
3316 if (nb_events < 0) {
3317 ret = -nb_events;
3318 goto error;
3319 }
3320
3321 /*
3322 * Setup lttng message with payload size set to the event list size in
3323 * bytes and then copy list into the llm payload.
3324 */
3325 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events);
3326 if (ret < 0) {
3327 free(events);
3328 goto setup_error;
3329 }
3330
3331 /* Copy event list into message payload */
3332 memcpy(cmd_ctx->llm->payload, events,
3333 sizeof(struct lttng_event) * nb_events);
3334
3335 free(events);
3336
3337 ret = LTTCOMM_OK;
3338 break;
3339 }
3340 case LTTNG_START_TRACE:
3341 {
3342 ret = cmd_start_trace(cmd_ctx->session);
3343 break;
3344 }
3345 case LTTNG_STOP_TRACE:
3346 {
3347 ret = cmd_stop_trace(cmd_ctx->session);
3348 break;
3349 }
3350 case LTTNG_CREATE_SESSION:
3351 {
3352 ret = cmd_create_session(cmd_ctx->lsm->session.name,
3353 cmd_ctx->lsm->session.path, &cmd_ctx->creds);
3354 break;
3355 }
3356 case LTTNG_DESTROY_SESSION:
3357 {
3358 ret = cmd_destroy_session(cmd_ctx->session,
3359 cmd_ctx->lsm->session.name);
3360 break;
3361 }
3362 case LTTNG_LIST_DOMAINS:
3363 {
3364 ssize_t nb_dom;
3365 struct lttng_domain *domains;
3366
3367 nb_dom = cmd_list_domains(cmd_ctx->session, &domains);
3368 if (nb_dom < 0) {
3369 ret = -nb_dom;
3370 goto error;
3371 }
3372
3373 ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain));
3374 if (ret < 0) {
3375 goto setup_error;
3376 }
3377
3378 /* Copy event list into message payload */
3379 memcpy(cmd_ctx->llm->payload, domains,
3380 nb_dom * sizeof(struct lttng_domain));
3381
3382 free(domains);
3383
3384 ret = LTTCOMM_OK;
3385 break;
3386 }
3387 case LTTNG_LIST_CHANNELS:
3388 {
3389 size_t nb_chan;
3390 struct lttng_channel *channels;
3391
3392 nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type,
3393 cmd_ctx->session, &channels);
3394 if (nb_chan < 0) {
3395 ret = -nb_chan;
3396 goto error;
3397 }
3398
3399 ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel));
3400 if (ret < 0) {
3401 goto setup_error;
3402 }
3403
3404 /* Copy event list into message payload */
3405 memcpy(cmd_ctx->llm->payload, channels,
3406 nb_chan * sizeof(struct lttng_channel));
3407
3408 free(channels);
3409
3410 ret = LTTCOMM_OK;
3411 break;
3412 }
3413 case LTTNG_LIST_EVENTS:
3414 {
3415 ssize_t nb_event;
3416 struct lttng_event *events = NULL;
3417
3418 nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session,
3419 cmd_ctx->lsm->u.list.channel_name, &events);
3420 if (nb_event < 0) {
3421 ret = -nb_event;
3422 goto error;
3423 }
3424
3425 ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event));
3426 if (ret < 0) {
3427 goto setup_error;
3428 }
3429
3430 /* Copy event list into message payload */
3431 memcpy(cmd_ctx->llm->payload, events,
3432 nb_event * sizeof(struct lttng_event));
3433
3434 free(events);
3435
3436 ret = LTTCOMM_OK;
3437 break;
3438 }
3439 case LTTNG_LIST_SESSIONS:
3440 {
3441 unsigned int nr_sessions;
3442
3443 session_lock_list();
3444 nr_sessions = lttng_sessions_count(cmd_ctx->creds.uid, cmd_ctx->creds.gid);
3445 if (nr_sessions == 0) {
3446 ret = LTTCOMM_NO_SESSION;
3447 session_unlock_list();
3448 goto error;
3449 }
3450 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * nr_sessions);
3451 if (ret < 0) {
3452 session_unlock_list();
3453 goto setup_error;
3454 }
3455
3456 /* Filled the session array */
3457 list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload),
3458 cmd_ctx->creds.uid, cmd_ctx->creds.gid);
3459
3460 session_unlock_list();
3461
3462 ret = LTTCOMM_OK;
3463 break;
3464 }
3465 case LTTNG_CALIBRATE:
3466 {
3467 ret = cmd_calibrate(cmd_ctx->lsm->domain.type,
3468 &cmd_ctx->lsm->u.calibrate);
3469 break;
3470 }
3471 case LTTNG_REGISTER_CONSUMER:
3472 {
3473 ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3474 cmd_ctx->lsm->u.reg.path);
3475 break;
3476 }
3477 default:
3478 ret = LTTCOMM_UND;
3479 break;
3480 }
3481
3482 error:
3483 if (cmd_ctx->llm == NULL) {
3484 DBG("Missing llm structure. Allocating one.");
3485 if (setup_lttng_msg(cmd_ctx, 0) < 0) {
3486 goto setup_error;
3487 }
3488 }
3489 /* Set return code */
3490 cmd_ctx->llm->ret_code = ret;
3491 setup_error:
3492 if (cmd_ctx->session) {
3493 session_unlock(cmd_ctx->session);
3494 }
3495 init_setup_error:
3496 return ret;
3497 }
3498
3499 /*
3500 * This thread manage all clients request using the unix client socket for
3501 * communication.
3502 */
3503 static void *thread_manage_clients(void *data)
3504 {
3505 int sock = 0, ret, i, pollfd;
3506 uint32_t revents, nb_fd;
3507 struct command_ctx *cmd_ctx = NULL;
3508 struct lttng_poll_event events;
3509
3510 DBG("[thread] Manage client started");
3511
3512 rcu_register_thread();
3513
3514 ret = lttcomm_listen_unix_sock(client_sock);
3515 if (ret < 0) {
3516 goto error;
3517 }
3518
3519 /*
3520 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3521 * more will be added to this poll set.
3522 */
3523 ret = create_thread_poll_set(&events, 2);
3524 if (ret < 0) {
3525 goto error;
3526 }
3527
3528 /* Add the application registration socket */
3529 ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI);
3530 if (ret < 0) {
3531 goto error;
3532 }
3533
3534 /*
3535 * Notify parent pid that we are ready to accept command for client side.
3536 */
3537 if (opt_sig_parent) {
3538 kill(ppid, SIGCHLD);
3539 }
3540
3541 while (1) {
3542 DBG("Accepting client command ...");
3543
3544 nb_fd = LTTNG_POLL_GETNB(&events);
3545
3546 /* Inifinite blocking call, waiting for transmission */
3547 ret = lttng_poll_wait(&events, -1);
3548 if (ret < 0) {
3549 goto error;
3550 }
3551
3552 for (i = 0; i < nb_fd; i++) {
3553 /* Fetch once the poll data */
3554 revents = LTTNG_POLL_GETEV(&events, i);
3555 pollfd = LTTNG_POLL_GETFD(&events, i);
3556
3557 /* Thread quit pipe has been closed. Killing thread. */
3558 ret = check_thread_quit_pipe(pollfd, revents);
3559 if (ret) {
3560 goto error;
3561 }
3562
3563 /* Event on the registration socket */
3564 if (pollfd == client_sock) {
3565 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3566 ERR("Client socket poll error");
3567 goto error;
3568 }
3569 }
3570 }
3571
3572 DBG("Wait for client response");
3573
3574 sock = lttcomm_accept_unix_sock(client_sock);
3575 if (sock < 0) {
3576 goto error;
3577 }
3578
3579 /* Set socket option for credentials retrieval */
3580 ret = lttcomm_setsockopt_creds_unix_sock(sock);
3581 if (ret < 0) {
3582 goto error;
3583 }
3584
3585 /* Allocate context command to process the client request */
3586 cmd_ctx = zmalloc(sizeof(struct command_ctx));
3587 if (cmd_ctx == NULL) {
3588 perror("zmalloc cmd_ctx");
3589 goto error;
3590 }
3591
3592 /* Allocate data buffer for reception */
3593 cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg));
3594 if (cmd_ctx->lsm == NULL) {
3595 perror("zmalloc cmd_ctx->lsm");
3596 goto error;
3597 }
3598
3599 cmd_ctx->llm = NULL;
3600 cmd_ctx->session = NULL;
3601
3602 /*
3603 * Data is received from the lttng client. The struct
3604 * lttcomm_session_msg (lsm) contains the command and data request of
3605 * the client.
3606 */
3607 DBG("Receiving data from client ...");
3608 ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm,
3609 sizeof(struct lttcomm_session_msg), &cmd_ctx->creds);
3610 if (ret <= 0) {
3611 DBG("Nothing recv() from client... continuing");
3612 close(sock);
3613 free(cmd_ctx);
3614 continue;
3615 }
3616
3617 // TODO: Validate cmd_ctx including sanity check for
3618 // security purpose.
3619
3620 rcu_thread_online();
3621 /*
3622 * This function dispatch the work to the kernel or userspace tracer
3623 * libs and fill the lttcomm_lttng_msg data structure of all the needed
3624 * informations for the client. The command context struct contains
3625 * everything this function may needs.
3626 */
3627 ret = process_client_msg(cmd_ctx);
3628 rcu_thread_offline();
3629 if (ret < 0) {
3630 /*
3631 * TODO: Inform client somehow of the fatal error. At
3632 * this point, ret < 0 means that a zmalloc failed
3633 * (ENOMEM). Error detected but still accept command.
3634 */
3635 clean_command_ctx(&cmd_ctx);
3636 continue;
3637 }
3638
3639 DBG("Sending response (size: %d, retcode: %s)",
3640 cmd_ctx->lttng_msg_size,
3641 lttng_strerror(-cmd_ctx->llm->ret_code));
3642 ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size);
3643 if (ret < 0) {
3644 ERR("Failed to send data back to client");
3645 }
3646
3647 /* End of transmission */
3648 close(sock);
3649
3650 clean_command_ctx(&cmd_ctx);
3651 }
3652
3653 error:
3654 DBG("Client thread dying");
3655 unlink(client_unix_sock_path);
3656 close(client_sock);
3657 close(sock);
3658
3659 lttng_poll_clean(&events);
3660 clean_command_ctx(&cmd_ctx);
3661
3662 rcu_unregister_thread();
3663 return NULL;
3664 }
3665
3666
3667 /*
3668 * usage function on stderr
3669 */
3670 static void usage(void)
3671 {
3672 fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname);
3673 fprintf(stderr, " -h, --help Display this usage.\n");
3674 fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n");
3675 fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n");
3676 fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
3677 fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
3678 fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n");
3679 fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n");
3680 fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n");
3681 fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n");
3682 fprintf(stderr, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n");
3683 fprintf(stderr, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n");
3684 fprintf(stderr, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n");
3685 fprintf(stderr, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n");
3686 fprintf(stderr, " -d, --daemonize Start as a daemon.\n");
3687 fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
3688 fprintf(stderr, " -V, --version Show version number.\n");
3689 fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
3690 fprintf(stderr, " -q, --quiet No output at all.\n");
3691 fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
3692 fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n");
3693 fprintf(stderr, " --no-kernel Disable kernel tracer\n");
3694 }
3695
3696 /*
3697 * daemon argument parsing
3698 */
3699 static int parse_args(int argc, char **argv)
3700 {
3701 int c;
3702
3703 static struct option long_options[] = {
3704 { "client-sock", 1, 0, 'c' },
3705 { "apps-sock", 1, 0, 'a' },
3706 { "kconsumerd-cmd-sock", 1, 0, 'C' },
3707 { "kconsumerd-err-sock", 1, 0, 'E' },
3708 { "ustconsumerd32-cmd-sock", 1, 0, 'G' },
3709 { "ustconsumerd32-err-sock", 1, 0, 'H' },
3710 { "ustconsumerd64-cmd-sock", 1, 0, 'D' },
3711 { "ustconsumerd64-err-sock", 1, 0, 'F' },
3712 { "consumerd32-path", 1, 0, 'u' },
3713 { "consumerd32-libdir", 1, 0, 'U' },
3714 { "consumerd64-path", 1, 0, 't' },
3715 { "consumerd64-libdir", 1, 0, 'T' },
3716 { "daemonize", 0, 0, 'd' },
3717 { "sig-parent", 0, 0, 'S' },
3718 { "help", 0, 0, 'h' },
3719 { "group", 1, 0, 'g' },
3720 { "version", 0, 0, 'V' },
3721 { "quiet", 0, 0, 'q' },
3722 { "verbose", 0, 0, 'v' },
3723 { "verbose-consumer", 0, 0, 'Z' },
3724 { "no-kernel", 0, 0, 'N' },
3725 { NULL, 0, 0, 0 }
3726 };
3727
3728 while (1) {
3729 int option_index = 0;
3730 c = getopt_long(argc, argv, "dhqvVSN" "a:c:g:s:C:E:D:F:Z:u:t",
3731 long_options, &option_index);
3732 if (c == -1) {
3733 break;
3734 }
3735
3736 switch (c) {
3737 case 0:
3738 fprintf(stderr, "option %s", long_options[option_index].name);
3739 if (optarg) {
3740 fprintf(stderr, " with arg %s\n", optarg);
3741 }
3742 break;
3743 case 'c':
3744 snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg);
3745 break;
3746 case 'a':
3747 snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg);
3748 break;
3749 case 'd':
3750 opt_daemon = 1;
3751 break;
3752 case 'g':
3753 opt_tracing_group = optarg;
3754 break;
3755 case 'h':
3756 usage();
3757 exit(EXIT_FAILURE);
3758 case 'V':
3759 fprintf(stdout, "%s\n", VERSION);
3760 exit(EXIT_SUCCESS);
3761 case 'S':
3762 opt_sig_parent = 1;
3763 break;
3764 case 'E':
3765 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3766 break;
3767 case 'C':
3768 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3769 break;
3770 case 'F':
3771 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3772 break;
3773 case 'D':
3774 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3775 break;
3776 case 'H':
3777 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3778 break;
3779 case 'G':
3780 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3781 break;
3782 case 'N':
3783 opt_no_kernel = 1;
3784 break;
3785 case 'q':
3786 opt_quiet = 1;
3787 break;
3788 case 'v':
3789 /* Verbose level can increase using multiple -v */
3790 opt_verbose += 1;
3791 break;
3792 case 'Z':
3793 opt_verbose_consumer += 1;
3794 break;
3795 case 'u':
3796 consumerd32_bin= optarg;
3797 break;
3798 case 'U':
3799 consumerd32_libdir = optarg;
3800 break;
3801 case 't':
3802 consumerd64_bin = optarg;
3803 break;
3804 case 'T':
3805 consumerd64_libdir = optarg;
3806 break;
3807 default:
3808 /* Unknown option or other error.
3809 * Error is printed by getopt, just return */
3810 return -1;
3811 }
3812 }
3813
3814 return 0;
3815 }
3816
3817 /*
3818 * Creates the two needed socket by the daemon.
3819 * apps_sock - The communication socket for all UST apps.
3820 * client_sock - The communication of the cli tool (lttng).
3821 */
3822 static int init_daemon_socket(void)
3823 {
3824 int ret = 0;
3825 mode_t old_umask;
3826
3827 old_umask = umask(0);
3828
3829 /* Create client tool unix socket */
3830 client_sock = lttcomm_create_unix_sock(client_unix_sock_path);
3831 if (client_sock < 0) {
3832 ERR("Create unix sock failed: %s", client_unix_sock_path);
3833 ret = -1;
3834 goto end;
3835 }
3836
3837 /* File permission MUST be 660 */
3838 ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
3839 if (ret < 0) {
3840 ERR("Set file permissions failed: %s", client_unix_sock_path);
3841 perror("chmod");
3842 goto end;
3843 }
3844
3845 /* Create the application unix socket */
3846 apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path);
3847 if (apps_sock < 0) {
3848 ERR("Create unix sock failed: %s", apps_unix_sock_path);
3849 ret = -1;
3850 goto end;
3851 }
3852
3853 /* File permission MUST be 666 */
3854 ret = chmod(apps_unix_sock_path,
3855 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
3856 if (ret < 0) {
3857 ERR("Set file permissions failed: %s", apps_unix_sock_path);
3858 perror("chmod");
3859 goto end;
3860 }
3861
3862 end:
3863 umask(old_umask);
3864 return ret;
3865 }
3866
3867 /*
3868 * Check if the global socket is available, and if a daemon is answering at the
3869 * other side. If yes, error is returned.
3870 */
3871 static int check_existing_daemon(void)
3872 {
3873 if (access(client_unix_sock_path, F_OK) < 0 &&
3874 access(apps_unix_sock_path, F_OK) < 0) {
3875 return 0;
3876 }
3877
3878 /* Is there anybody out there ? */
3879 if (lttng_session_daemon_alive()) {
3880 return -EEXIST;
3881 } else {
3882 return 0;
3883 }
3884 }
3885
3886 /*
3887 * Set the tracing group gid onto the client socket.
3888 *
3889 * Race window between mkdir and chown is OK because we are going from more
3890 * permissive (root.root) to les permissive (root.tracing).
3891 */
3892 static int set_permissions(char *rundir)
3893 {
3894 int ret;
3895 gid_t gid;
3896
3897 gid = allowed_group();
3898 if (gid < 0) {
3899 WARN("No tracing group detected");
3900 ret = 0;
3901 goto end;
3902 }
3903
3904 /* Set lttng run dir */
3905 ret = chown(rundir, 0, gid);
3906 if (ret < 0) {
3907 ERR("Unable to set group on %s", rundir);
3908 perror("chown");
3909 }
3910
3911 /* lttng client socket path */
3912 ret = chown(client_unix_sock_path, 0, gid);
3913 if (ret < 0) {
3914 ERR("Unable to set group on %s", client_unix_sock_path);
3915 perror("chown");
3916 }
3917
3918 /* kconsumer error socket path */
3919 ret = chown(kconsumer_data.err_unix_sock_path, 0, gid);
3920 if (ret < 0) {
3921 ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path);
3922 perror("chown");
3923 }
3924
3925 /* 64-bit ustconsumer error socket path */
3926 ret = chown(ustconsumer64_data.err_unix_sock_path, 0, gid);
3927 if (ret < 0) {
3928 ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path);
3929 perror("chown");
3930 }
3931
3932 /* 32-bit ustconsumer compat32 error socket path */
3933 ret = chown(ustconsumer32_data.err_unix_sock_path, 0, gid);
3934 if (ret < 0) {
3935 ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path);
3936 perror("chown");
3937 }
3938
3939 DBG("All permissions are set");
3940
3941 end:
3942 return ret;
3943 }
3944
3945 /*
3946 * Create the pipe used to wake up the kernel thread.
3947 */
3948 static int create_kernel_poll_pipe(void)
3949 {
3950 return pipe2(kernel_poll_pipe, O_CLOEXEC);
3951 }
3952
3953 /*
3954 * Create the application command pipe to wake thread_manage_apps.
3955 */
3956 static int create_apps_cmd_pipe(void)
3957 {
3958 return pipe2(apps_cmd_pipe, O_CLOEXEC);
3959 }
3960
3961 /*
3962 * Create the lttng run directory needed for all global sockets and pipe.
3963 */
3964 static int create_lttng_rundir(const char *rundir)
3965 {
3966 int ret;
3967
3968 DBG3("Creating LTTng run directory: %s", rundir);
3969
3970 ret = mkdir(rundir, S_IRWXU | S_IRWXG );
3971 if (ret < 0) {
3972 if (errno != EEXIST) {
3973 ERR("Unable to create %s", rundir);
3974 goto error;
3975 } else {
3976 ret = 0;
3977 }
3978 }
3979
3980 error:
3981 return ret;
3982 }
3983
3984 /*
3985 * Setup sockets and directory needed by the kconsumerd communication with the
3986 * session daemon.
3987 */
3988 static int set_consumer_sockets(struct consumer_data *consumer_data,
3989 const char *rundir)
3990 {
3991 int ret;
3992 char path[PATH_MAX];
3993
3994 switch (consumer_data->type) {
3995 case LTTNG_CONSUMER_KERNEL:
3996 snprintf(path, PATH_MAX, DEFAULT_KCONSUMERD_PATH, rundir);
3997 break;
3998 case LTTNG_CONSUMER64_UST:
3999 snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD64_PATH, rundir);
4000 break;
4001 case LTTNG_CONSUMER32_UST:
4002 snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD32_PATH, rundir);
4003 break;
4004 default:
4005 ERR("Consumer type unknown");
4006 ret = -EINVAL;
4007 goto error;
4008 }
4009
4010 DBG2("Creating consumer directory: %s", path);
4011
4012 ret = mkdir(path, S_IRWXU | S_IRWXG);
4013 if (ret < 0) {
4014 if (errno != EEXIST) {
4015 ERR("Failed to create %s", path);
4016 goto error;
4017 }
4018 ret = 0;
4019 }
4020
4021 /* Create the kconsumerd error unix socket */
4022 consumer_data->err_sock =
4023 lttcomm_create_unix_sock(consumer_data->err_unix_sock_path);
4024 if (consumer_data->err_sock < 0) {
4025 ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path);
4026 ret = -1;
4027 goto error;
4028 }
4029
4030 /* File permission MUST be 660 */
4031 ret = chmod(consumer_data->err_unix_sock_path,
4032 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
4033 if (ret < 0) {
4034 ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path);
4035 PERROR("chmod");
4036 goto error;
4037 }
4038
4039 error:
4040 return ret;
4041 }
4042
4043 /*
4044 * Signal handler for the daemon
4045 *
4046 * Simply stop all worker threads, leaving main() return gracefully after
4047 * joining all threads and calling cleanup().
4048 */
4049 static void sighandler(int sig)
4050 {
4051 switch (sig) {
4052 case SIGPIPE:
4053 DBG("SIGPIPE caugth");
4054 return;
4055 case SIGINT:
4056 DBG("SIGINT caugth");
4057 stop_threads();
4058 break;
4059 case SIGTERM:
4060 DBG("SIGTERM caugth");
4061 stop_threads();
4062 break;
4063 default:
4064 break;
4065 }
4066 }
4067
4068 /*
4069 * Setup signal handler for :
4070 * SIGINT, SIGTERM, SIGPIPE
4071 */
4072 static int set_signal_handler(void)
4073 {
4074 int ret = 0;
4075 struct sigaction sa;
4076 sigset_t sigset;
4077
4078 if ((ret = sigemptyset(&sigset)) < 0) {
4079 perror("sigemptyset");
4080 return ret;
4081 }
4082
4083 sa.sa_handler = sighandler;
4084 sa.sa_mask = sigset;
4085 sa.sa_flags = 0;
4086 if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
4087 perror("sigaction");
4088 return ret;
4089 }
4090
4091 if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
4092 perror("sigaction");
4093 return ret;
4094 }
4095
4096 if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
4097 perror("sigaction");
4098 return ret;
4099 }
4100
4101 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
4102
4103 return ret;
4104 }
4105
4106 /*
4107 * Set open files limit to unlimited. This daemon can open a large number of
4108 * file descriptors in order to consumer multiple kernel traces.
4109 */
4110 static void set_ulimit(void)
4111 {
4112 int ret;
4113 struct rlimit lim;
4114
4115 /* The kernel does not allowed an infinite limit for open files */
4116 lim.rlim_cur = 65535;
4117 lim.rlim_max = 65535;
4118
4119 ret = setrlimit(RLIMIT_NOFILE, &lim);
4120 if (ret < 0) {
4121 perror("failed to set open files limit");
4122 }
4123 }
4124
4125 /*
4126 * main
4127 */
4128 int main(int argc, char **argv)
4129 {
4130 int ret = 0;
4131 void *status;
4132 const char *home_path;
4133
4134 rcu_register_thread();
4135
4136 /* Create thread quit pipe */
4137 if ((ret = init_thread_quit_pipe()) < 0) {
4138 goto error;
4139 }
4140
4141 setup_consumerd_path();
4142
4143 /* Parse arguments */
4144 progname = argv[0];
4145 if ((ret = parse_args(argc, argv) < 0)) {
4146 goto error;
4147 }
4148
4149 /* Daemonize */
4150 if (opt_daemon) {
4151 ret = daemon(0, 0);
4152 if (ret < 0) {
4153 perror("daemon");
4154 goto error;
4155 }
4156 }
4157
4158 /* Check if daemon is UID = 0 */
4159 is_root = !getuid();
4160
4161 if (is_root) {
4162 rundir = strdup(DEFAULT_LTTNG_RUNDIR);
4163
4164 /* Create global run dir with root access */
4165 ret = create_lttng_rundir(rundir);
4166 if (ret < 0) {
4167 goto error;
4168 }
4169
4170 if (strlen(apps_unix_sock_path) == 0) {
4171 snprintf(apps_unix_sock_path, PATH_MAX,
4172 DEFAULT_GLOBAL_APPS_UNIX_SOCK);
4173 }
4174
4175 if (strlen(client_unix_sock_path) == 0) {
4176 snprintf(client_unix_sock_path, PATH_MAX,
4177 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK);
4178 }
4179
4180 /* Set global SHM for ust */
4181 if (strlen(wait_shm_path) == 0) {
4182 snprintf(wait_shm_path, PATH_MAX,
4183 DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH);
4184 }
4185
4186 /* Setup kernel consumerd path */
4187 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX,
4188 DEFAULT_KCONSUMERD_ERR_SOCK_PATH, rundir);
4189 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX,
4190 DEFAULT_KCONSUMERD_CMD_SOCK_PATH, rundir);
4191
4192 DBG2("Kernel consumer err path: %s",
4193 kconsumer_data.err_unix_sock_path);
4194 DBG2("Kernel consumer cmd path: %s",
4195 kconsumer_data.cmd_unix_sock_path);
4196 } else {
4197 home_path = get_home_dir();
4198 if (home_path == NULL) {
4199 /* TODO: Add --socket PATH option */
4200 ERR("Can't get HOME directory for sockets creation.");
4201 ret = -EPERM;
4202 goto error;
4203 }
4204
4205 /*
4206 * Create rundir from home path. This will create something like
4207 * $HOME/.lttng
4208 */
4209 ret = asprintf(&rundir, DEFAULT_LTTNG_HOME_RUNDIR, home_path);
4210 if (ret < 0) {
4211 ret = -ENOMEM;
4212 goto error;
4213 }
4214
4215 ret = create_lttng_rundir(rundir);
4216 if (ret < 0) {
4217 goto error;
4218 }
4219
4220 if (strlen(apps_unix_sock_path) == 0) {
4221 snprintf(apps_unix_sock_path, PATH_MAX,
4222 DEFAULT_HOME_APPS_UNIX_SOCK, home_path);
4223 }
4224
4225 /* Set the cli tool unix socket path */
4226 if (strlen(client_unix_sock_path) == 0) {
4227 snprintf(client_unix_sock_path, PATH_MAX,
4228 DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path);
4229 }
4230
4231 /* Set global SHM for ust */
4232 if (strlen(wait_shm_path) == 0) {
4233 snprintf(wait_shm_path, PATH_MAX,
4234 DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid());
4235 }
4236 }
4237
4238 DBG("Client socket path %s", client_unix_sock_path);
4239 DBG("Application socket path %s", apps_unix_sock_path);
4240 DBG("LTTng run directory path: %s", rundir);
4241
4242 /* 32 bits consumerd path setup */
4243 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX,
4244 DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, rundir);
4245 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX,
4246 DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, rundir);
4247
4248 DBG2("UST consumer 32 bits err path: %s",
4249 ustconsumer32_data.err_unix_sock_path);
4250 DBG2("UST consumer 32 bits cmd path: %s",
4251 ustconsumer32_data.cmd_unix_sock_path);
4252
4253 /* 64 bits consumerd path setup */
4254 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX,
4255 DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, rundir);
4256 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX,
4257 DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, rundir);
4258
4259 DBG2("UST consumer 64 bits err path: %s",
4260 ustconsumer64_data.err_unix_sock_path);
4261 DBG2("UST consumer 64 bits cmd path: %s",
4262 ustconsumer64_data.cmd_unix_sock_path);
4263
4264 /*
4265 * See if daemon already exist.
4266 */
4267 if ((ret = check_existing_daemon()) < 0) {
4268 ERR("Already running daemon.\n");
4269 /*
4270 * We do not goto exit because we must not cleanup()
4271 * because a daemon is already running.
4272 */
4273 goto error;
4274 }
4275
4276 /* After this point, we can safely call cleanup() with "goto exit" */
4277
4278 /*
4279 * These actions must be executed as root. We do that *after* setting up
4280 * the sockets path because we MUST make the check for another daemon using
4281 * those paths *before* trying to set the kernel consumer sockets and init
4282 * kernel tracer.
4283 */
4284 if (is_root) {
4285 ret = set_consumer_sockets(&kconsumer_data, rundir);
4286 if (ret < 0) {
4287 goto exit;
4288 }
4289
4290 /* Setup kernel tracer */
4291 if (!opt_no_kernel) {
4292 init_kernel_tracer();
4293 }
4294
4295 /* Set ulimit for open files */
4296 set_ulimit();
4297 }
4298
4299 ret = set_consumer_sockets(&ustconsumer64_data, rundir);
4300 if (ret < 0) {
4301 goto exit;
4302 }
4303
4304 ret = set_consumer_sockets(&ustconsumer32_data, rundir);
4305 if (ret < 0) {
4306 goto exit;
4307 }
4308
4309 if ((ret = set_signal_handler()) < 0) {
4310 goto exit;
4311 }
4312
4313 /* Setup the needed unix socket */
4314 if ((ret = init_daemon_socket()) < 0) {
4315 goto exit;
4316 }
4317
4318 /* Set credentials to socket */
4319 if (is_root && ((ret = set_permissions(rundir)) < 0)) {
4320 goto exit;
4321 }
4322
4323 /* Get parent pid if -S, --sig-parent is specified. */
4324 if (opt_sig_parent) {
4325 ppid = getppid();
4326 }
4327
4328 /* Setup the kernel pipe for waking up the kernel thread */
4329 if ((ret = create_kernel_poll_pipe()) < 0) {
4330 goto exit;
4331 }
4332
4333 /* Setup the thread apps communication pipe. */
4334 if ((ret = create_apps_cmd_pipe()) < 0) {
4335 goto exit;
4336 }
4337
4338 /* Init UST command queue. */
4339 cds_wfq_init(&ust_cmd_queue.queue);
4340
4341 /* Init UST app hash table */
4342 ust_app_ht_alloc();
4343
4344 /*
4345 * Get session list pointer. This pointer MUST NOT be free(). This list is
4346 * statically declared in session.c
4347 */
4348 session_list_ptr = session_get_list();
4349
4350 /* Set up max poll set size */
4351 lttng_poll_set_max_size();
4352
4353 /* Create thread to manage the client socket */
4354 ret = pthread_create(&client_thread, NULL,
4355 thread_manage_clients, (void *) NULL);
4356 if (ret != 0) {
4357 perror("pthread_create clients");
4358 goto exit_client;
4359 }
4360
4361 /* Create thread to dispatch registration */
4362 ret = pthread_create(&dispatch_thread, NULL,
4363 thread_dispatch_ust_registration, (void *) NULL);
4364 if (ret != 0) {
4365 perror("pthread_create dispatch");
4366 goto exit_dispatch;
4367 }
4368
4369 /* Create thread to manage application registration. */
4370 ret = pthread_create(&reg_apps_thread, NULL,
4371 thread_registration_apps, (void *) NULL);
4372 if (ret != 0) {
4373 perror("pthread_create registration");
4374 goto exit_reg_apps;
4375 }
4376
4377 /* Create thread to manage application socket */
4378 ret = pthread_create(&apps_thread, NULL,
4379 thread_manage_apps, (void *) NULL);
4380 if (ret != 0) {
4381 perror("pthread_create apps");
4382 goto exit_apps;
4383 }
4384
4385 /* Create kernel thread to manage kernel event */
4386 ret = pthread_create(&kernel_thread, NULL,
4387 thread_manage_kernel, (void *) NULL);
4388 if (ret != 0) {
4389 perror("pthread_create kernel");
4390 goto exit_kernel;
4391 }
4392
4393 ret = pthread_join(kernel_thread, &status);
4394 if (ret != 0) {
4395 perror("pthread_join");
4396 goto error; /* join error, exit without cleanup */
4397 }
4398
4399 exit_kernel:
4400 ret = pthread_join(apps_thread, &status);
4401 if (ret != 0) {
4402 perror("pthread_join");
4403 goto error; /* join error, exit without cleanup */
4404 }
4405
4406 exit_apps:
4407 ret = pthread_join(reg_apps_thread, &status);
4408 if (ret != 0) {
4409 perror("pthread_join");
4410 goto error; /* join error, exit without cleanup */
4411 }
4412
4413 exit_reg_apps:
4414 ret = pthread_join(dispatch_thread, &status);
4415 if (ret != 0) {
4416 perror("pthread_join");
4417 goto error; /* join error, exit without cleanup */
4418 }
4419
4420 exit_dispatch:
4421 ret = pthread_join(client_thread, &status);
4422 if (ret != 0) {
4423 perror("pthread_join");
4424 goto error; /* join error, exit without cleanup */
4425 }
4426
4427 ret = join_consumer_thread(&kconsumer_data);
4428 if (ret != 0) {
4429 perror("join_consumer");
4430 goto error; /* join error, exit without cleanup */
4431 }
4432
4433 exit_client:
4434 exit:
4435 /*
4436 * cleanup() is called when no other thread is running.
4437 */
4438 rcu_thread_online();
4439 cleanup();
4440 rcu_thread_offline();
4441 rcu_unregister_thread();
4442 if (!ret) {
4443 exit(EXIT_SUCCESS);
4444 }
4445 error:
4446 exit(EXIT_FAILURE);
4447 }
LTTng 2.0 tools and control repository
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