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Rename sessiond internal "uid" fields to "id"
[lttng-tools.git] / lttng-sessiond / main.c
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1/*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the Free
7 * Software Foundation; only version 2 of the License.
8 *
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
13 *
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
16 * Place - Suite 330, Boston, MA 02111-1307, USA.
17 */
18
19#define _GNU_SOURCE
20#include <fcntl.h>
21#include <getopt.h>
22#include <grp.h>
23#include <limits.h>
24#include <pthread.h>
25#include <semaphore.h>
26#include <signal.h>
27#include <stdio.h>
28#include <stdlib.h>
29#include <string.h>
30#include <sys/mman.h>
31#include <sys/mount.h>
32#include <sys/resource.h>
33#include <sys/socket.h>
34#include <sys/stat.h>
35#include <sys/types.h>
36#include <sys/wait.h>
37#include <urcu/futex.h>
38#include <unistd.h>
39#include <config.h>
40
41#include <lttng-consumerd.h>
42#include <lttng-sessiond-comm.h>
43#include <lttng/lttng-consumer.h>
44
45#include <lttngerr.h>
46
47#include "channel.h"
48#include "compat/poll.h"
49#include "context.h"
50#include "event.h"
51#include "futex.h"
52#include "hashtable.h"
53#include "kernel.h"
54#include "lttng-sessiond.h"
55#include "shm.h"
56#include "ust-app.h"
57#include "ust-ctl.h"
58#include "utils.h"
59
60#define CONSUMERD_FILE "lttng-consumerd"
61
62struct consumer_data {
63 enum lttng_consumer_type type;
64
65 pthread_t thread; /* Worker thread interacting with the consumer */
66 sem_t sem;
67
68 /* Mutex to control consumerd pid assignation */
69 pthread_mutex_t pid_mutex;
70 pid_t pid;
71
72 int err_sock;
73 int cmd_sock;
74
75 /* consumer error and command Unix socket path */
76 char err_unix_sock_path[PATH_MAX];
77 char cmd_unix_sock_path[PATH_MAX];
78};
79
80/* Const values */
81const char default_home_dir[] = DEFAULT_HOME_DIR;
82const char default_tracing_group[] = LTTNG_DEFAULT_TRACING_GROUP;
83const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR;
84const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE;
85
86/* Variables */
87int opt_verbose; /* Not static for lttngerr.h */
88int opt_verbose_consumer; /* Not static for lttngerr.h */
89int opt_quiet; /* Not static for lttngerr.h */
90
91const char *progname;
92const char *opt_tracing_group;
93static int opt_sig_parent;
94static int opt_daemon;
95static int opt_no_kernel;
96static int is_root; /* Set to 1 if the daemon is running as root */
97static pid_t ppid; /* Parent PID for --sig-parent option */
98static char *rundir;
99
100/* Consumer daemon specific control data */
101static struct consumer_data kconsumer_data = {
102 .type = LTTNG_CONSUMER_KERNEL,
103 .err_unix_sock_path = KCONSUMERD_ERR_SOCK_PATH,
104 .cmd_unix_sock_path = KCONSUMERD_CMD_SOCK_PATH,
105};
106static struct consumer_data ustconsumer64_data = {
107 .type = LTTNG_CONSUMER64_UST,
108 .err_unix_sock_path = USTCONSUMERD64_ERR_SOCK_PATH,
109 .cmd_unix_sock_path = USTCONSUMERD64_CMD_SOCK_PATH,
110};
111static struct consumer_data ustconsumer32_data = {
112 .type = LTTNG_CONSUMER32_UST,
113 .err_unix_sock_path = USTCONSUMERD32_ERR_SOCK_PATH,
114 .cmd_unix_sock_path = USTCONSUMERD32_CMD_SOCK_PATH,
115};
116
117static int dispatch_thread_exit;
118
119/* Global application Unix socket path */
120static char apps_unix_sock_path[PATH_MAX];
121/* Global client Unix socket path */
122static char client_unix_sock_path[PATH_MAX];
123/* global wait shm path for UST */
124static char wait_shm_path[PATH_MAX];
125
126/* Sockets and FDs */
127static int client_sock;
128static int apps_sock;
129static int kernel_tracer_fd;
130static int kernel_poll_pipe[2];
131
132/*
133 * Quit pipe for all threads. This permits a single cancellation point
134 * for all threads when receiving an event on the pipe.
135 */
136static int thread_quit_pipe[2];
137
138/*
139 * This pipe is used to inform the thread managing application communication
140 * that a command is queued and ready to be processed.
141 */
142static int apps_cmd_pipe[2];
143
144/* Pthread, Mutexes and Semaphores */
145static pthread_t apps_thread;
146static pthread_t reg_apps_thread;
147static pthread_t client_thread;
148static pthread_t kernel_thread;
149static pthread_t dispatch_thread;
150
151
152/*
153 * UST registration command queue. This queue is tied with a futex and uses a N
154 * wakers / 1 waiter implemented and detailed in futex.c/.h
155 *
156 * The thread_manage_apps and thread_dispatch_ust_registration interact with
157 * this queue and the wait/wake scheme.
158 */
159static struct ust_cmd_queue ust_cmd_queue;
160
161/*
162 * Pointer initialized before thread creation.
163 *
164 * This points to the tracing session list containing the session count and a
165 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
166 * MUST NOT be taken if you call a public function in session.c.
167 *
168 * The lock is nested inside the structure: session_list_ptr->lock. Please use
169 * session_lock_list and session_unlock_list for lock acquisition.
170 */
171static struct ltt_session_list *session_list_ptr;
172
173int ust_consumerd64_fd = -1;
174int ust_consumerd32_fd = -1;
175
176static const char *consumerd32_bin =
177 __stringify(CONFIG_CONSUMERD32_BIN);
178static const char *consumerd64_bin =
179 __stringify(CONFIG_CONSUMERD64_BIN);
180static const char *consumerd32_libdir =
181 __stringify(CONFIG_CONSUMERD32_LIBDIR);
182static const char *consumerd64_libdir =
183 __stringify(CONFIG_CONSUMERD64_LIBDIR);
184
185static
186void setup_consumerd_path(void)
187{
188 const char *bin, *libdir;
189
190 /*
191 * Allow INSTALL_BIN_PATH to be used as a target path for the
192 * native architecture size consumer if CONFIG_CONSUMER*_PATH
193 * has not been defined.
194 */
195#if (CAA_BITS_PER_LONG == 32)
196 if (!consumerd32_bin[0]) {
197 consumerd32_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
198 }
199 if (!consumerd32_libdir[0]) {
200 consumerd32_libdir = INSTALL_LIB_PATH;
201 }
202#elif (CAA_BITS_PER_LONG == 64)
203 if (!consumerd64_bin[0]) {
204 consumerd64_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
205 }
206 if (!consumerd64_libdir[0]) {
207 consumerd64_libdir = INSTALL_LIB_PATH;
208 }
209#else
210#error "Unknown bitness"
211#endif
212
213 /*
214 * runtime env. var. overrides the build default.
215 */
216 bin = getenv("LTTNG_CONSUMERD32_BIN");
217 if (bin) {
218 consumerd32_bin = bin;
219 }
220 bin = getenv("LTTNG_CONSUMERD64_BIN");
221 if (bin) {
222 consumerd64_bin = bin;
223 }
224 libdir = getenv("LTTNG_TOOLS_CONSUMERD32_LIBDIR");
225 if (libdir) {
226 consumerd32_libdir = libdir;
227 }
228 libdir = getenv("LTTNG_TOOLS_CONSUMERD64_LIBDIR");
229 if (libdir) {
230 consumerd64_libdir = libdir;
231 }
232}
233
234/*
235 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
236 */
237static int create_thread_poll_set(struct lttng_poll_event *events,
238 unsigned int size)
239{
240 int ret;
241
242 if (events == NULL || size == 0) {
243 ret = -1;
244 goto error;
245 }
246
247 ret = lttng_poll_create(events, size, LTTNG_CLOEXEC);
248 if (ret < 0) {
249 goto error;
250 }
251
252 /* Add quit pipe */
253 ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN);
254 if (ret < 0) {
255 goto error;
256 }
257
258 return 0;
259
260error:
261 return ret;
262}
263
264/*
265 * Check if the thread quit pipe was triggered.
266 *
267 * Return 1 if it was triggered else 0;
268 */
269static int check_thread_quit_pipe(int fd, uint32_t events)
270{
271 if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) {
272 return 1;
273 }
274
275 return 0;
276}
277
278/*
279 * Remove modules in reverse load order.
280 */
281static int modprobe_remove_kernel_modules(void)
282{
283 int ret = 0, i;
284 char modprobe[256];
285
286 for (i = ARRAY_SIZE(kernel_modules_list) - 1; i >= 0; i--) {
287 ret = snprintf(modprobe, sizeof(modprobe),
288 "/sbin/modprobe -r -q %s",
289 kernel_modules_list[i].name);
290 if (ret < 0) {
291 perror("snprintf modprobe -r");
292 goto error;
293 }
294 modprobe[sizeof(modprobe) - 1] = '\0';
295 ret = system(modprobe);
296 if (ret == -1) {
297 ERR("Unable to launch modprobe -r for module %s",
298 kernel_modules_list[i].name);
299 } else if (kernel_modules_list[i].required
300 && WEXITSTATUS(ret) != 0) {
301 ERR("Unable to remove module %s",
302 kernel_modules_list[i].name);
303 } else {
304 DBG("Modprobe removal successful %s",
305 kernel_modules_list[i].name);
306 }
307 }
308
309error:
310 return ret;
311}
312
313/*
314 * Return group ID of the tracing group or -1 if not found.
315 */
316static gid_t allowed_group(void)
317{
318 struct group *grp;
319
320 if (opt_tracing_group) {
321 grp = getgrnam(opt_tracing_group);
322 } else {
323 grp = getgrnam(default_tracing_group);
324 }
325 if (!grp) {
326 return -1;
327 } else {
328 return grp->gr_gid;
329 }
330}
331
332/*
333 * Init thread quit pipe.
334 *
335 * Return -1 on error or 0 if all pipes are created.
336 */
337static int init_thread_quit_pipe(void)
338{
339 int ret;
340
341 ret = pipe2(thread_quit_pipe, O_CLOEXEC);
342 if (ret < 0) {
343 perror("thread quit pipe");
344 goto error;
345 }
346
347error:
348 return ret;
349}
350
351/*
352 * Complete teardown of a kernel session. This free all data structure related
353 * to a kernel session and update counter.
354 */
355static void teardown_kernel_session(struct ltt_session *session)
356{
357 if (!session->kernel_session) {
358 DBG3("No kernel session when tearingdown session");
359 return;
360 }
361
362 DBG("Tearing down kernel session");
363
364 /*
365 * If a custom kernel consumer was registered, close the socket before
366 * tearing down the complete kernel session structure
367 */
368 if (session->kernel_session->consumer_fd != kconsumer_data.cmd_sock) {
369 lttcomm_close_unix_sock(session->kernel_session->consumer_fd);
370 }
371
372 trace_kernel_destroy_session(session->kernel_session);
373}
374
375/*
376 * Complete teardown of all UST sessions. This will free everything on his path
377 * and destroy the core essence of all ust sessions :)
378 */
379static void teardown_ust_session(struct ltt_session *session)
380{
381 int ret;
382
383 if (!session->ust_session) {
384 DBG3("No UST session when tearingdown session");
385 return;
386 }
387
388 DBG("Tearing down UST session(s)");
389
390 ret = ust_app_destroy_trace_all(session->ust_session);
391 if (ret) {
392 ERR("Error in ust_app_destroy_trace_all");
393 }
394
395 trace_ust_destroy_session(session->ust_session);
396}
397
398/*
399 * Stop all threads by closing the thread quit pipe.
400 */
401static void stop_threads(void)
402{
403 int ret;
404
405 /* Stopping all threads */
406 DBG("Terminating all threads");
407 ret = notify_thread_pipe(thread_quit_pipe[1]);
408 if (ret < 0) {
409 ERR("write error on thread quit pipe");
410 }
411
412 /* Dispatch thread */
413 dispatch_thread_exit = 1;
414 futex_nto1_wake(&ust_cmd_queue.futex);
415}
416
417/*
418 * Cleanup the daemon
419 */
420static void cleanup(void)
421{
422 int ret;
423 char *cmd;
424 struct ltt_session *sess, *stmp;
425
426 DBG("Cleaning up");
427
428 DBG("Removing %s directory", rundir);
429 ret = asprintf(&cmd, "rm -rf %s", rundir);
430 if (ret < 0) {
431 ERR("asprintf failed. Something is really wrong!");
432 }
433
434 /* Remove lttng run directory */
435 ret = system(cmd);
436 if (ret < 0) {
437 ERR("Unable to clean %s", rundir);
438 }
439 free(cmd);
440
441 DBG("Cleaning up all session");
442
443 /* Destroy session list mutex */
444 if (session_list_ptr != NULL) {
445 pthread_mutex_destroy(&session_list_ptr->lock);
446
447 /* Cleanup ALL session */
448 cds_list_for_each_entry_safe(sess, stmp,
449 &session_list_ptr->head, list) {
450 teardown_kernel_session(sess);
451 teardown_ust_session(sess);
452 free(sess);
453 }
454 }
455
456 DBG("Closing all UST sockets");
457 ust_app_clean_list();
458
459 pthread_mutex_destroy(&kconsumer_data.pid_mutex);
460
461 if (is_root && !opt_no_kernel) {
462 DBG2("Closing kernel fd");
463 close(kernel_tracer_fd);
464 DBG("Unloading kernel modules");
465 modprobe_remove_kernel_modules();
466 }
467
468 close(thread_quit_pipe[0]);
469 close(thread_quit_pipe[1]);
470
471 /* <fun> */
472 DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm"
473 "Matthew, BEET driven development works!%c[%dm",
474 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
475 /* </fun> */
476}
477
478/*
479 * Send data on a unix socket using the liblttsessiondcomm API.
480 *
481 * Return lttcomm error code.
482 */
483static int send_unix_sock(int sock, void *buf, size_t len)
484{
485 /* Check valid length */
486 if (len <= 0) {
487 return -1;
488 }
489
490 return lttcomm_send_unix_sock(sock, buf, len);
491}
492
493/*
494 * Free memory of a command context structure.
495 */
496static void clean_command_ctx(struct command_ctx **cmd_ctx)
497{
498 DBG("Clean command context structure");
499 if (*cmd_ctx) {
500 if ((*cmd_ctx)->llm) {
501 free((*cmd_ctx)->llm);
502 }
503 if ((*cmd_ctx)->lsm) {
504 free((*cmd_ctx)->lsm);
505 }
506 free(*cmd_ctx);
507 *cmd_ctx = NULL;
508 }
509}
510
511/*
512 * Send all stream fds of kernel channel to the consumer.
513 */
514static int send_kconsumer_channel_streams(struct consumer_data *consumer_data,
515 int sock, struct ltt_kernel_channel *channel)
516{
517 int ret;
518 struct ltt_kernel_stream *stream;
519 struct lttcomm_consumer_msg lkm;
520
521 DBG("Sending streams of channel %s to kernel consumer",
522 channel->channel->name);
523
524 /* Send channel */
525 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
526 lkm.u.channel.channel_key = channel->fd;
527 lkm.u.channel.max_sb_size = channel->channel->attr.subbuf_size;
528 lkm.u.channel.mmap_len = 0; /* for kernel */
529 DBG("Sending channel %d to consumer", lkm.u.channel.channel_key);
530 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
531 if (ret < 0) {
532 perror("send consumer channel");
533 goto error;
534 }
535
536 /* Send streams */
537 cds_list_for_each_entry(stream, &channel->stream_list.head, list) {
538 if (!stream->fd) {
539 continue;
540 }
541 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
542 lkm.u.stream.channel_key = channel->fd;
543 lkm.u.stream.stream_key = stream->fd;
544 lkm.u.stream.state = stream->state;
545 lkm.u.stream.output = channel->channel->attr.output;
546 lkm.u.stream.mmap_len = 0; /* for kernel */
547 strncpy(lkm.u.stream.path_name, stream->pathname, PATH_MAX - 1);
548 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
549 DBG("Sending stream %d to consumer", lkm.u.stream.stream_key);
550 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
551 if (ret < 0) {
552 perror("send consumer stream");
553 goto error;
554 }
555 ret = lttcomm_send_fds_unix_sock(sock, &stream->fd, 1);
556 if (ret < 0) {
557 perror("send consumer stream ancillary data");
558 goto error;
559 }
560 }
561
562 DBG("consumer channel streams sent");
563
564 return 0;
565
566error:
567 return ret;
568}
569
570/*
571 * Send all stream fds of the kernel session to the consumer.
572 */
573static int send_kconsumer_session_streams(struct consumer_data *consumer_data,
574 struct ltt_kernel_session *session)
575{
576 int ret;
577 struct ltt_kernel_channel *chan;
578 struct lttcomm_consumer_msg lkm;
579 int sock = session->consumer_fd;
580
581 DBG("Sending metadata stream fd");
582
583 /* Extra protection. It's NOT supposed to be set to 0 at this point */
584 if (session->consumer_fd == 0) {
585 session->consumer_fd = consumer_data->cmd_sock;
586 }
587
588 if (session->metadata_stream_fd != 0) {
589 /* Send metadata channel fd */
590 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
591 lkm.u.channel.channel_key = session->metadata->fd;
592 lkm.u.channel.max_sb_size = session->metadata->conf->attr.subbuf_size;
593 lkm.u.channel.mmap_len = 0; /* for kernel */
594 DBG("Sending metadata channel %d to consumer", lkm.u.stream.stream_key);
595 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
596 if (ret < 0) {
597 perror("send consumer channel");
598 goto error;
599 }
600
601 /* Send metadata stream fd */
602 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
603 lkm.u.stream.channel_key = session->metadata->fd;
604 lkm.u.stream.stream_key = session->metadata_stream_fd;
605 lkm.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM;
606 lkm.u.stream.output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
607 lkm.u.stream.mmap_len = 0; /* for kernel */
608 strncpy(lkm.u.stream.path_name, session->metadata->pathname, PATH_MAX - 1);
609 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
610 DBG("Sending metadata stream %d to consumer", lkm.u.stream.stream_key);
611 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
612 if (ret < 0) {
613 perror("send consumer stream");
614 goto error;
615 }
616 ret = lttcomm_send_fds_unix_sock(sock, &session->metadata_stream_fd, 1);
617 if (ret < 0) {
618 perror("send consumer stream");
619 goto error;
620 }
621 }
622
623 cds_list_for_each_entry(chan, &session->channel_list.head, list) {
624 ret = send_kconsumer_channel_streams(consumer_data, sock, chan);
625 if (ret < 0) {
626 goto error;
627 }
628 }
629
630 DBG("consumer fds (metadata and channel streams) sent");
631
632 return 0;
633
634error:
635 return ret;
636}
637
638/*
639 * Notify UST applications using the shm mmap futex.
640 */
641static int notify_ust_apps(int active)
642{
643 char *wait_shm_mmap;
644
645 DBG("Notifying applications of session daemon state: %d", active);
646
647 /* See shm.c for this call implying mmap, shm and futex calls */
648 wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root);
649 if (wait_shm_mmap == NULL) {
650 goto error;
651 }
652
653 /* Wake waiting process */
654 futex_wait_update((int32_t *) wait_shm_mmap, active);
655
656 /* Apps notified successfully */
657 return 0;
658
659error:
660 return -1;
661}
662
663/*
664 * Setup the outgoing data buffer for the response (llm) by allocating the
665 * right amount of memory and copying the original information from the lsm
666 * structure.
667 *
668 * Return total size of the buffer pointed by buf.
669 */
670static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size)
671{
672 int ret, buf_size;
673
674 buf_size = size;
675
676 cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size);
677 if (cmd_ctx->llm == NULL) {
678 perror("zmalloc");
679 ret = -ENOMEM;
680 goto error;
681 }
682
683 /* Copy common data */
684 cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type;
685 cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid;
686
687 cmd_ctx->llm->data_size = size;
688 cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size;
689
690 return buf_size;
691
692error:
693 return ret;
694}
695
696/*
697 * Update the kernel poll set of all channel fd available over all tracing
698 * session. Add the wakeup pipe at the end of the set.
699 */
700static int update_kernel_poll(struct lttng_poll_event *events)
701{
702 int ret;
703 struct ltt_session *session;
704 struct ltt_kernel_channel *channel;
705
706 DBG("Updating kernel poll set");
707
708 session_lock_list();
709 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
710 session_lock(session);
711 if (session->kernel_session == NULL) {
712 session_unlock(session);
713 continue;
714 }
715
716 cds_list_for_each_entry(channel,
717 &session->kernel_session->channel_list.head, list) {
718 /* Add channel fd to the kernel poll set */
719 ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM);
720 if (ret < 0) {
721 session_unlock(session);
722 goto error;
723 }
724 DBG("Channel fd %d added to kernel set", channel->fd);
725 }
726 session_unlock(session);
727 }
728 session_unlock_list();
729
730 return 0;
731
732error:
733 session_unlock_list();
734 return -1;
735}
736
737/*
738 * Find the channel fd from 'fd' over all tracing session. When found, check
739 * for new channel stream and send those stream fds to the kernel consumer.
740 *
741 * Useful for CPU hotplug feature.
742 */
743static int update_kernel_stream(struct consumer_data *consumer_data, int fd)
744{
745 int ret = 0;
746 struct ltt_session *session;
747 struct ltt_kernel_channel *channel;
748
749 DBG("Updating kernel streams for channel fd %d", fd);
750
751 session_lock_list();
752 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
753 session_lock(session);
754 if (session->kernel_session == NULL) {
755 session_unlock(session);
756 continue;
757 }
758
759 /* This is not suppose to be 0 but this is an extra security check */
760 if (session->kernel_session->consumer_fd == 0) {
761 session->kernel_session->consumer_fd = consumer_data->cmd_sock;
762 }
763
764 cds_list_for_each_entry(channel,
765 &session->kernel_session->channel_list.head, list) {
766 if (channel->fd == fd) {
767 DBG("Channel found, updating kernel streams");
768 ret = kernel_open_channel_stream(channel);
769 if (ret < 0) {
770 goto error;
771 }
772
773 /*
774 * Have we already sent fds to the consumer? If yes, it means
775 * that tracing is started so it is safe to send our updated
776 * stream fds.
777 */
778 if (session->kernel_session->consumer_fds_sent == 1) {
779 ret = send_kconsumer_channel_streams(consumer_data,
780 session->kernel_session->consumer_fd, channel);
781 if (ret < 0) {
782 goto error;
783 }
784 }
785 goto error;
786 }
787 }
788 session_unlock(session);
789 }
790 session_unlock_list();
791 return ret;
792
793error:
794 session_unlock(session);
795 session_unlock_list();
796 return ret;
797}
798
799/*
800 * For each tracing session, update newly registered apps.
801 */
802static void update_ust_app(int app_sock)
803{
804 struct ltt_session *sess, *stmp;
805
806 /* For all tracing session(s) */
807 cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) {
808 if (sess->ust_session) {
809 ust_app_global_update(sess->ust_session, app_sock);
810 }
811 }
812}
813
814/*
815 * This thread manage event coming from the kernel.
816 *
817 * Features supported in this thread:
818 * -) CPU Hotplug
819 */
820static void *thread_manage_kernel(void *data)
821{
822 int ret, i, pollfd, update_poll_flag = 1;
823 uint32_t revents, nb_fd;
824 char tmp;
825 struct lttng_poll_event events;
826
827 DBG("Thread manage kernel started");
828
829 ret = create_thread_poll_set(&events, 2);
830 if (ret < 0) {
831 goto error;
832 }
833
834 ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN);
835 if (ret < 0) {
836 goto error;
837 }
838
839 while (1) {
840 if (update_poll_flag == 1) {
841 /*
842 * Reset number of fd in the poll set. Always 2 since there is the thread
843 * quit pipe and the kernel pipe.
844 */
845 events.nb_fd = 2;
846
847 ret = update_kernel_poll(&events);
848 if (ret < 0) {
849 goto error;
850 }
851 update_poll_flag = 0;
852 }
853
854 nb_fd = LTTNG_POLL_GETNB(&events);
855
856 DBG("Thread kernel polling on %d fds", nb_fd);
857
858 /* Zeroed the poll events */
859 lttng_poll_reset(&events);
860
861 /* Poll infinite value of time */
862 ret = lttng_poll_wait(&events, -1);
863 if (ret < 0) {
864 goto error;
865 } else if (ret == 0) {
866 /* Should not happen since timeout is infinite */
867 ERR("Return value of poll is 0 with an infinite timeout.\n"
868 "This should not have happened! Continuing...");
869 continue;
870 }
871
872 for (i = 0; i < nb_fd; i++) {
873 /* Fetch once the poll data */
874 revents = LTTNG_POLL_GETEV(&events, i);
875 pollfd = LTTNG_POLL_GETFD(&events, i);
876
877 /* Thread quit pipe has been closed. Killing thread. */
878 ret = check_thread_quit_pipe(pollfd, revents);
879 if (ret) {
880 goto error;
881 }
882
883 /* Check for data on kernel pipe */
884 if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) {
885 ret = read(kernel_poll_pipe[0], &tmp, 1);
886 update_poll_flag = 1;
887 continue;
888 } else {
889 /*
890 * New CPU detected by the kernel. Adding kernel stream to
891 * kernel session and updating the kernel consumer
892 */
893 if (revents & LPOLLIN) {
894 ret = update_kernel_stream(&kconsumer_data, pollfd);
895 if (ret < 0) {
896 continue;
897 }
898 break;
899 /*
900 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
901 * and unregister kernel stream at this point.
902 */
903 }
904 }
905 }
906 }
907
908error:
909 DBG("Kernel thread dying");
910 close(kernel_poll_pipe[0]);
911 close(kernel_poll_pipe[1]);
912
913 lttng_poll_clean(&events);
914
915 return NULL;
916}
917
918/*
919 * This thread manage the consumer error sent back to the session daemon.
920 */
921static void *thread_manage_consumer(void *data)
922{
923 int sock = 0, i, ret, pollfd;
924 uint32_t revents, nb_fd;
925 enum lttcomm_return_code code;
926 struct lttng_poll_event events;
927 struct consumer_data *consumer_data = data;
928
929 DBG("[thread] Manage consumer started");
930
931 ret = lttcomm_listen_unix_sock(consumer_data->err_sock);
932 if (ret < 0) {
933 goto error;
934 }
935
936 /*
937 * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock.
938 * Nothing more will be added to this poll set.
939 */
940 ret = create_thread_poll_set(&events, 2);
941 if (ret < 0) {
942 goto error;
943 }
944
945 ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP);
946 if (ret < 0) {
947 goto error;
948 }
949
950 nb_fd = LTTNG_POLL_GETNB(&events);
951
952 /* Inifinite blocking call, waiting for transmission */
953 ret = lttng_poll_wait(&events, -1);
954 if (ret < 0) {
955 goto error;
956 }
957
958 for (i = 0; i < nb_fd; i++) {
959 /* Fetch once the poll data */
960 revents = LTTNG_POLL_GETEV(&events, i);
961 pollfd = LTTNG_POLL_GETFD(&events, i);
962
963 /* Thread quit pipe has been closed. Killing thread. */
964 ret = check_thread_quit_pipe(pollfd, revents);
965 if (ret) {
966 goto error;
967 }
968
969 /* Event on the registration socket */
970 if (pollfd == consumer_data->err_sock) {
971 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
972 ERR("consumer err socket poll error");
973 goto error;
974 }
975 }
976 }
977
978 sock = lttcomm_accept_unix_sock(consumer_data->err_sock);
979 if (sock < 0) {
980 goto error;
981 }
982
983 DBG2("Receiving code from consumer err_sock");
984
985 /* Getting status code from kconsumerd */
986 ret = lttcomm_recv_unix_sock(sock, &code,
987 sizeof(enum lttcomm_return_code));
988 if (ret <= 0) {
989 goto error;
990 }
991
992 if (code == CONSUMERD_COMMAND_SOCK_READY) {
993 consumer_data->cmd_sock =
994 lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path);
995 if (consumer_data->cmd_sock < 0) {
996 sem_post(&consumer_data->sem);
997 PERROR("consumer connect");
998 goto error;
999 }
1000 /* Signal condition to tell that the kconsumerd is ready */
1001 sem_post(&consumer_data->sem);
1002 DBG("consumer command socket ready");
1003 } else {
1004 ERR("consumer error when waiting for SOCK_READY : %s",
1005 lttcomm_get_readable_code(-code));
1006 goto error;
1007 }
1008
1009 /* Remove the kconsumerd error sock since we've established a connexion */
1010 ret = lttng_poll_del(&events, consumer_data->err_sock);
1011 if (ret < 0) {
1012 goto error;
1013 }
1014
1015 ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP);
1016 if (ret < 0) {
1017 goto error;
1018 }
1019
1020 /* Update number of fd */
1021 nb_fd = LTTNG_POLL_GETNB(&events);
1022
1023 /* Inifinite blocking call, waiting for transmission */
1024 ret = lttng_poll_wait(&events, -1);
1025 if (ret < 0) {
1026 goto error;
1027 }
1028
1029 for (i = 0; i < nb_fd; i++) {
1030 /* Fetch once the poll data */
1031 revents = LTTNG_POLL_GETEV(&events, i);
1032 pollfd = LTTNG_POLL_GETFD(&events, i);
1033
1034 /* Thread quit pipe has been closed. Killing thread. */
1035 ret = check_thread_quit_pipe(pollfd, revents);
1036 if (ret) {
1037 goto error;
1038 }
1039
1040 /* Event on the kconsumerd socket */
1041 if (pollfd == sock) {
1042 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1043 ERR("consumer err socket second poll error");
1044 goto error;
1045 }
1046 }
1047 }
1048
1049 /* Wait for any kconsumerd error */
1050 ret = lttcomm_recv_unix_sock(sock, &code,
1051 sizeof(enum lttcomm_return_code));
1052 if (ret <= 0) {
1053 ERR("consumer closed the command socket");
1054 goto error;
1055 }
1056
1057 ERR("consumer return code : %s", lttcomm_get_readable_code(-code));
1058
1059error:
1060 DBG("consumer thread dying");
1061 close(consumer_data->err_sock);
1062 close(consumer_data->cmd_sock);
1063 close(sock);
1064
1065 unlink(consumer_data->err_unix_sock_path);
1066 unlink(consumer_data->cmd_unix_sock_path);
1067 consumer_data->pid = 0;
1068
1069 lttng_poll_clean(&events);
1070
1071 return NULL;
1072}
1073
1074/*
1075 * This thread manage application communication.
1076 */
1077static void *thread_manage_apps(void *data)
1078{
1079 int i, ret, pollfd;
1080 uint32_t revents, nb_fd;
1081 struct ust_command ust_cmd;
1082 struct lttng_poll_event events;
1083
1084 DBG("[thread] Manage application started");
1085
1086 rcu_register_thread();
1087 rcu_thread_online();
1088
1089 ret = create_thread_poll_set(&events, 2);
1090 if (ret < 0) {
1091 goto error;
1092 }
1093
1094 ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP);
1095 if (ret < 0) {
1096 goto error;
1097 }
1098
1099 while (1) {
1100 /* Zeroed the events structure */
1101 lttng_poll_reset(&events);
1102
1103 nb_fd = LTTNG_POLL_GETNB(&events);
1104
1105 DBG("Apps thread polling on %d fds", nb_fd);
1106
1107 /* Inifinite blocking call, waiting for transmission */
1108 ret = lttng_poll_wait(&events, -1);
1109 if (ret < 0) {
1110 goto error;
1111 }
1112
1113 for (i = 0; i < nb_fd; i++) {
1114 /* Fetch once the poll data */
1115 revents = LTTNG_POLL_GETEV(&events, i);
1116 pollfd = LTTNG_POLL_GETFD(&events, i);
1117
1118 /* Thread quit pipe has been closed. Killing thread. */
1119 ret = check_thread_quit_pipe(pollfd, revents);
1120 if (ret) {
1121 goto error;
1122 }
1123
1124 /* Inspect the apps cmd pipe */
1125 if (pollfd == apps_cmd_pipe[0]) {
1126 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1127 ERR("Apps command pipe error");
1128 goto error;
1129 } else if (revents & LPOLLIN) {
1130 /* Empty pipe */
1131 ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd));
1132 if (ret < 0 || ret < sizeof(ust_cmd)) {
1133 perror("read apps cmd pipe");
1134 goto error;
1135 }
1136
1137 /* Register applicaton to the session daemon */
1138 ret = ust_app_register(&ust_cmd.reg_msg,
1139 ust_cmd.sock);
1140 if (ret == -ENOMEM) {
1141 goto error;
1142 } else if (ret < 0) {
1143 break;
1144 }
1145
1146 /*
1147 * Add channel(s) and event(s) to newly registered apps
1148 * from lttng global UST domain.
1149 */
1150 update_ust_app(ust_cmd.sock);
1151
1152 ret = ustctl_register_done(ust_cmd.sock);
1153 if (ret < 0) {
1154 /*
1155 * If the registration is not possible, we simply
1156 * unregister the apps and continue
1157 */
1158 ust_app_unregister(ust_cmd.sock);
1159 } else {
1160 /*
1161 * We just need here to monitor the close of the UST
1162 * socket and poll set monitor those by default.
1163 */
1164 ret = lttng_poll_add(&events, ust_cmd.sock, 0);
1165 if (ret < 0) {
1166 goto error;
1167 }
1168
1169 DBG("Apps with sock %d added to poll set",
1170 ust_cmd.sock);
1171 }
1172
1173 break;
1174 }
1175 } else {
1176 /*
1177 * At this point, we know that a registered application made
1178 * the event at poll_wait.
1179 */
1180 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1181 /* Removing from the poll set */
1182 ret = lttng_poll_del(&events, pollfd);
1183 if (ret < 0) {
1184 goto error;
1185 }
1186
1187 /* Socket closed on remote end. */
1188 ust_app_unregister(pollfd);
1189 break;
1190 }
1191 }
1192 }
1193 }
1194
1195error:
1196 DBG("Application communication apps dying");
1197 close(apps_cmd_pipe[0]);
1198 close(apps_cmd_pipe[1]);
1199
1200 lttng_poll_clean(&events);
1201
1202 rcu_thread_offline();
1203 rcu_unregister_thread();
1204 return NULL;
1205}
1206
1207/*
1208 * Dispatch request from the registration threads to the application
1209 * communication thread.
1210 */
1211static void *thread_dispatch_ust_registration(void *data)
1212{
1213 int ret;
1214 struct cds_wfq_node *node;
1215 struct ust_command *ust_cmd = NULL;
1216
1217 DBG("[thread] Dispatch UST command started");
1218
1219 while (!dispatch_thread_exit) {
1220 /* Atomically prepare the queue futex */
1221 futex_nto1_prepare(&ust_cmd_queue.futex);
1222
1223 do {
1224 /* Dequeue command for registration */
1225 node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue);
1226 if (node == NULL) {
1227 DBG("Woken up but nothing in the UST command queue");
1228 /* Continue thread execution */
1229 break;
1230 }
1231
1232 ust_cmd = caa_container_of(node, struct ust_command, node);
1233
1234 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1235 " gid:%d sock:%d name:%s (version %d.%d)",
1236 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1237 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1238 ust_cmd->sock, ust_cmd->reg_msg.name,
1239 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
1240 /*
1241 * Inform apps thread of the new application registration. This
1242 * call is blocking so we can be assured that the data will be read
1243 * at some point in time or wait to the end of the world :)
1244 */
1245 ret = write(apps_cmd_pipe[1], ust_cmd,
1246 sizeof(struct ust_command));
1247 if (ret < 0) {
1248 perror("write apps cmd pipe");
1249 if (errno == EBADF) {
1250 /*
1251 * We can't inform the application thread to process
1252 * registration. We will exit or else application
1253 * registration will not occur and tracing will never
1254 * start.
1255 */
1256 goto error;
1257 }
1258 }
1259 free(ust_cmd);
1260 } while (node != NULL);
1261
1262 /* Futex wait on queue. Blocking call on futex() */
1263 futex_nto1_wait(&ust_cmd_queue.futex);
1264 }
1265
1266error:
1267 DBG("Dispatch thread dying");
1268 return NULL;
1269}
1270
1271/*
1272 * This thread manage application registration.
1273 */
1274static void *thread_registration_apps(void *data)
1275{
1276 int sock = 0, i, ret, pollfd;
1277 uint32_t revents, nb_fd;
1278 struct lttng_poll_event events;
1279 /*
1280 * Get allocated in this thread, enqueued to a global queue, dequeued and
1281 * freed in the manage apps thread.
1282 */
1283 struct ust_command *ust_cmd = NULL;
1284
1285 DBG("[thread] Manage application registration started");
1286
1287 ret = lttcomm_listen_unix_sock(apps_sock);
1288 if (ret < 0) {
1289 goto error;
1290 }
1291
1292 /*
1293 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1294 * more will be added to this poll set.
1295 */
1296 ret = create_thread_poll_set(&events, 2);
1297 if (ret < 0) {
1298 goto error;
1299 }
1300
1301 /* Add the application registration socket */
1302 ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP);
1303 if (ret < 0) {
1304 goto error;
1305 }
1306
1307 /* Notify all applications to register */
1308 ret = notify_ust_apps(1);
1309 if (ret < 0) {
1310 ERR("Failed to notify applications or create the wait shared memory.\n"
1311 "Execution continues but there might be problem for already\n"
1312 "running applications that wishes to register.");
1313 }
1314
1315 while (1) {
1316 DBG("Accepting application registration");
1317
1318 nb_fd = LTTNG_POLL_GETNB(&events);
1319
1320 /* Inifinite blocking call, waiting for transmission */
1321 ret = lttng_poll_wait(&events, -1);
1322 if (ret < 0) {
1323 goto error;
1324 }
1325
1326 for (i = 0; i < nb_fd; i++) {
1327 /* Fetch once the poll data */
1328 revents = LTTNG_POLL_GETEV(&events, i);
1329 pollfd = LTTNG_POLL_GETFD(&events, i);
1330
1331 /* Thread quit pipe has been closed. Killing thread. */
1332 ret = check_thread_quit_pipe(pollfd, revents);
1333 if (ret) {
1334 goto error;
1335 }
1336
1337 /* Event on the registration socket */
1338 if (pollfd == apps_sock) {
1339 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1340 ERR("Register apps socket poll error");
1341 goto error;
1342 } else if (revents & LPOLLIN) {
1343 sock = lttcomm_accept_unix_sock(apps_sock);
1344 if (sock < 0) {
1345 goto error;
1346 }
1347
1348 /* Create UST registration command for enqueuing */
1349 ust_cmd = zmalloc(sizeof(struct ust_command));
1350 if (ust_cmd == NULL) {
1351 perror("ust command zmalloc");
1352 goto error;
1353 }
1354
1355 /*
1356 * Using message-based transmissions to ensure we don't
1357 * have to deal with partially received messages.
1358 */
1359 ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg,
1360 sizeof(struct ust_register_msg));
1361 if (ret < 0 || ret < sizeof(struct ust_register_msg)) {
1362 if (ret < 0) {
1363 perror("lttcomm_recv_unix_sock register apps");
1364 } else {
1365 ERR("Wrong size received on apps register");
1366 }
1367 free(ust_cmd);
1368 close(sock);
1369 continue;
1370 }
1371
1372 ust_cmd->sock = sock;
1373
1374 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1375 " gid:%d sock:%d name:%s (version %d.%d)",
1376 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1377 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1378 ust_cmd->sock, ust_cmd->reg_msg.name,
1379 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
1380
1381 /*
1382 * Lock free enqueue the registration request. The red pill
1383 * has been taken! This apps will be part of the *system*.
1384 */
1385 cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node);
1386
1387 /*
1388 * Wake the registration queue futex. Implicit memory
1389 * barrier with the exchange in cds_wfq_enqueue.
1390 */
1391 futex_nto1_wake(&ust_cmd_queue.futex);
1392 }
1393 }
1394 }
1395 }
1396
1397error:
1398 DBG("UST Registration thread dying");
1399
1400 /* Notify that the registration thread is gone */
1401 notify_ust_apps(0);
1402
1403 close(apps_sock);
1404 close(sock);
1405 unlink(apps_unix_sock_path);
1406
1407 lttng_poll_clean(&events);
1408
1409 return NULL;
1410}
1411
1412/*
1413 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
1414 * exec or it will fails.
1415 */
1416static int spawn_consumer_thread(struct consumer_data *consumer_data)
1417{
1418 int ret;
1419 struct timespec timeout;
1420
1421 timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT;
1422 timeout.tv_nsec = 0;
1423
1424 /* Setup semaphore */
1425 ret = sem_init(&consumer_data->sem, 0, 0);
1426 if (ret < 0) {
1427 PERROR("sem_init consumer semaphore");
1428 goto error;
1429 }
1430
1431 ret = pthread_create(&consumer_data->thread, NULL,
1432 thread_manage_consumer, consumer_data);
1433 if (ret != 0) {
1434 PERROR("pthread_create consumer");
1435 ret = -1;
1436 goto error;
1437 }
1438
1439 /* Get time for sem_timedwait absolute timeout */
1440 ret = clock_gettime(CLOCK_REALTIME, &timeout);
1441 if (ret < 0) {
1442 PERROR("clock_gettime spawn consumer");
1443 /* Infinite wait for the kconsumerd thread to be ready */
1444 ret = sem_wait(&consumer_data->sem);
1445 } else {
1446 /* Normal timeout if the gettime was successful */
1447 timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT;
1448 ret = sem_timedwait(&consumer_data->sem, &timeout);
1449 }
1450
1451 if (ret < 0) {
1452 if (errno == ETIMEDOUT) {
1453 /*
1454 * Call has timed out so we kill the kconsumerd_thread and return
1455 * an error.
1456 */
1457 ERR("The consumer thread was never ready. Killing it");
1458 ret = pthread_cancel(consumer_data->thread);
1459 if (ret < 0) {
1460 PERROR("pthread_cancel consumer thread");
1461 }
1462 } else {
1463 PERROR("semaphore wait failed consumer thread");
1464 }
1465 goto error;
1466 }
1467
1468 pthread_mutex_lock(&consumer_data->pid_mutex);
1469 if (consumer_data->pid == 0) {
1470 ERR("Kconsumerd did not start");
1471 pthread_mutex_unlock(&consumer_data->pid_mutex);
1472 goto error;
1473 }
1474 pthread_mutex_unlock(&consumer_data->pid_mutex);
1475
1476 return 0;
1477
1478error:
1479 return ret;
1480}
1481
1482/*
1483 * Join consumer thread
1484 */
1485static int join_consumer_thread(struct consumer_data *consumer_data)
1486{
1487 void *status;
1488 int ret;
1489
1490 if (consumer_data->pid != 0) {
1491 ret = kill(consumer_data->pid, SIGTERM);
1492 if (ret) {
1493 ERR("Error killing consumer daemon");
1494 return ret;
1495 }
1496 return pthread_join(consumer_data->thread, &status);
1497 } else {
1498 return 0;
1499 }
1500}
1501
1502/*
1503 * Fork and exec a consumer daemon (consumerd).
1504 *
1505 * Return pid if successful else -1.
1506 */
1507static pid_t spawn_consumerd(struct consumer_data *consumer_data)
1508{
1509 int ret;
1510 pid_t pid;
1511 const char *consumer_to_use;
1512 const char *verbosity;
1513 struct stat st;
1514
1515 DBG("Spawning consumerd");
1516
1517 pid = fork();
1518 if (pid == 0) {
1519 /*
1520 * Exec consumerd.
1521 */
1522 if (opt_verbose > 1 || opt_verbose_consumer) {
1523 verbosity = "--verbose";
1524 } else {
1525 verbosity = "--quiet";
1526 }
1527 switch (consumer_data->type) {
1528 case LTTNG_CONSUMER_KERNEL:
1529 /*
1530 * Find out which consumerd to execute. We will
1531 * first try the 64-bit path, then the
1532 * sessiond's installation directory, and
1533 * fallback on the 32-bit one,
1534 */
1535 if (stat(consumerd64_bin, &st) == 0) {
1536 consumer_to_use = consumerd64_bin;
1537 } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) {
1538 consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
1539 } else if (stat(consumerd32_bin, &st) == 0) {
1540 consumer_to_use = consumerd32_bin;
1541 } else {
1542 break;
1543 }
1544 DBG("Using kernel consumer at: %s", consumer_to_use);
1545 execl(consumer_to_use,
1546 "lttng-consumerd", verbosity, "-k",
1547 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1548 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1549 NULL);
1550 break;
1551 case LTTNG_CONSUMER64_UST:
1552 {
1553 char *tmpnew = NULL;
1554
1555 if (consumerd64_libdir[0] != '\0') {
1556 char *tmp;
1557 size_t tmplen;
1558
1559 tmp = getenv("LD_LIBRARY_PATH");
1560 if (!tmp) {
1561 tmp = "";
1562 }
1563 tmplen = strlen("LD_LIBRARY_PATH=")
1564 + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp);
1565 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1566 if (!tmpnew) {
1567 ret = -ENOMEM;
1568 goto error;
1569 }
1570 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1571 strcat(tmpnew, consumerd64_libdir);
1572 if (tmp[0] != '\0') {
1573 strcat(tmpnew, ":");
1574 strcat(tmpnew, tmp);
1575 }
1576 ret = putenv(tmpnew);
1577 if (ret) {
1578 ret = -errno;
1579 goto error;
1580 }
1581 }
1582 DBG("Using 64-bit UST consumer at: %s", consumerd64_bin);
1583 ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u",
1584 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1585 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1586 NULL);
1587 if (consumerd64_libdir[0] != '\0') {
1588 free(tmpnew);
1589 }
1590 if (ret) {
1591 goto error;
1592 }
1593 break;
1594 }
1595 case LTTNG_CONSUMER32_UST:
1596 {
1597 char *tmpnew = NULL;
1598
1599 if (consumerd32_libdir[0] != '\0') {
1600 char *tmp;
1601 size_t tmplen;
1602
1603 tmp = getenv("LD_LIBRARY_PATH");
1604 if (!tmp) {
1605 tmp = "";
1606 }
1607 tmplen = strlen("LD_LIBRARY_PATH=")
1608 + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp);
1609 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1610 if (!tmpnew) {
1611 ret = -ENOMEM;
1612 goto error;
1613 }
1614 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1615 strcat(tmpnew, consumerd32_libdir);
1616 if (tmp[0] != '\0') {
1617 strcat(tmpnew, ":");
1618 strcat(tmpnew, tmp);
1619 }
1620 ret = putenv(tmpnew);
1621 if (ret) {
1622 ret = -errno;
1623 goto error;
1624 }
1625 }
1626 DBG("Using 32-bit UST consumer at: %s", consumerd32_bin);
1627 ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u",
1628 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1629 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1630 NULL);
1631 if (consumerd32_libdir[0] != '\0') {
1632 free(tmpnew);
1633 }
1634 if (ret) {
1635 goto error;
1636 }
1637 break;
1638 }
1639 default:
1640 perror("unknown consumer type");
1641 exit(EXIT_FAILURE);
1642 }
1643 if (errno != 0) {
1644 perror("kernel start consumer exec");
1645 }
1646 exit(EXIT_FAILURE);
1647 } else if (pid > 0) {
1648 ret = pid;
1649 } else {
1650 perror("start consumer fork");
1651 ret = -errno;
1652 }
1653error:
1654 return ret;
1655}
1656
1657/*
1658 * Spawn the consumerd daemon and session daemon thread.
1659 */
1660static int start_consumerd(struct consumer_data *consumer_data)
1661{
1662 int ret;
1663
1664 pthread_mutex_lock(&consumer_data->pid_mutex);
1665 if (consumer_data->pid != 0) {
1666 pthread_mutex_unlock(&consumer_data->pid_mutex);
1667 goto end;
1668 }
1669
1670 ret = spawn_consumerd(consumer_data);
1671 if (ret < 0) {
1672 ERR("Spawning consumerd failed");
1673 pthread_mutex_unlock(&consumer_data->pid_mutex);
1674 goto error;
1675 }
1676
1677 /* Setting up the consumer_data pid */
1678 consumer_data->pid = ret;
1679 DBG2("Consumer pid %d", consumer_data->pid);
1680 pthread_mutex_unlock(&consumer_data->pid_mutex);
1681
1682 DBG2("Spawning consumer control thread");
1683 ret = spawn_consumer_thread(consumer_data);
1684 if (ret < 0) {
1685 ERR("Fatal error spawning consumer control thread");
1686 goto error;
1687 }
1688
1689end:
1690 return 0;
1691
1692error:
1693 return ret;
1694}
1695
1696/*
1697 * modprobe_kernel_modules
1698 */
1699static int modprobe_kernel_modules(void)
1700{
1701 int ret = 0, i;
1702 char modprobe[256];
1703
1704 for (i = 0; i < ARRAY_SIZE(kernel_modules_list); i++) {
1705 ret = snprintf(modprobe, sizeof(modprobe),
1706 "/sbin/modprobe %s%s",
1707 kernel_modules_list[i].required ? "" : "-q ",
1708 kernel_modules_list[i].name);
1709 if (ret < 0) {
1710 perror("snprintf modprobe");
1711 goto error;
1712 }
1713 modprobe[sizeof(modprobe) - 1] = '\0';
1714 ret = system(modprobe);
1715 if (ret == -1) {
1716 ERR("Unable to launch modprobe for module %s",
1717 kernel_modules_list[i].name);
1718 } else if (kernel_modules_list[i].required
1719 && WEXITSTATUS(ret) != 0) {
1720 ERR("Unable to load module %s",
1721 kernel_modules_list[i].name);
1722 } else {
1723 DBG("Modprobe successfully %s",
1724 kernel_modules_list[i].name);
1725 }
1726 }
1727
1728error:
1729 return ret;
1730}
1731
1732/*
1733 * mount_debugfs
1734 */
1735static int mount_debugfs(char *path)
1736{
1737 int ret;
1738 char *type = "debugfs";
1739
1740 ret = mkdir_recursive(path, S_IRWXU | S_IRWXG, geteuid(), getegid());
1741 if (ret < 0) {
1742 PERROR("Cannot create debugfs path");
1743 goto error;
1744 }
1745
1746 ret = mount(type, path, type, 0, NULL);
1747 if (ret < 0) {
1748 PERROR("Cannot mount debugfs");
1749 goto error;
1750 }
1751
1752 DBG("Mounted debugfs successfully at %s", path);
1753
1754error:
1755 return ret;
1756}
1757
1758/*
1759 * Setup necessary data for kernel tracer action.
1760 */
1761static void init_kernel_tracer(void)
1762{
1763 int ret;
1764 char *proc_mounts = "/proc/mounts";
1765 char line[256];
1766 char *debugfs_path = NULL, *lttng_path = NULL;
1767 FILE *fp;
1768
1769 /* Detect debugfs */
1770 fp = fopen(proc_mounts, "r");
1771 if (fp == NULL) {
1772 ERR("Unable to probe %s", proc_mounts);
1773 goto error;
1774 }
1775
1776 while (fgets(line, sizeof(line), fp) != NULL) {
1777 if (strstr(line, "debugfs") != NULL) {
1778 /* Remove first string */
1779 strtok(line, " ");
1780 /* Dup string here so we can reuse line later on */
1781 debugfs_path = strdup(strtok(NULL, " "));
1782 DBG("Got debugfs path : %s", debugfs_path);
1783 break;
1784 }
1785 }
1786
1787 fclose(fp);
1788
1789 /* Mount debugfs if needded */
1790 if (debugfs_path == NULL) {
1791 ret = asprintf(&debugfs_path, "/mnt/debugfs");
1792 if (ret < 0) {
1793 perror("asprintf debugfs path");
1794 goto error;
1795 }
1796 ret = mount_debugfs(debugfs_path);
1797 if (ret < 0) {
1798 perror("Cannot mount debugfs");
1799 goto error;
1800 }
1801 }
1802
1803 /* Modprobe lttng kernel modules */
1804 ret = modprobe_kernel_modules();
1805 if (ret < 0) {
1806 goto error;
1807 }
1808
1809 /* Setup lttng kernel path */
1810 ret = asprintf(&lttng_path, "%s/lttng", debugfs_path);
1811 if (ret < 0) {
1812 perror("asprintf lttng path");
1813 goto error;
1814 }
1815
1816 /* Open debugfs lttng */
1817 kernel_tracer_fd = open(lttng_path, O_RDWR);
1818 if (kernel_tracer_fd < 0) {
1819 DBG("Failed to open %s", lttng_path);
1820 goto error;
1821 }
1822
1823 free(lttng_path);
1824 free(debugfs_path);
1825 DBG("Kernel tracer fd %d", kernel_tracer_fd);
1826 return;
1827
1828error:
1829 if (lttng_path) {
1830 free(lttng_path);
1831 }
1832 if (debugfs_path) {
1833 free(debugfs_path);
1834 }
1835 WARN("No kernel tracer available");
1836 kernel_tracer_fd = 0;
1837 return;
1838}
1839
1840/*
1841 * Init tracing by creating trace directory and sending fds kernel consumer.
1842 */
1843static int init_kernel_tracing(struct ltt_kernel_session *session)
1844{
1845 int ret = 0;
1846
1847 if (session->consumer_fds_sent == 0) {
1848 /*
1849 * Assign default kernel consumer socket if no consumer assigned to the
1850 * kernel session. At this point, it's NOT suppose to be 0 but this is
1851 * an extra security check.
1852 */
1853 if (session->consumer_fd == 0) {
1854 session->consumer_fd = kconsumer_data.cmd_sock;
1855 }
1856
1857 ret = send_kconsumer_session_streams(&kconsumer_data, session);
1858 if (ret < 0) {
1859 ret = LTTCOMM_KERN_CONSUMER_FAIL;
1860 goto error;
1861 }
1862
1863 session->consumer_fds_sent = 1;
1864 }
1865
1866error:
1867 return ret;
1868}
1869
1870/*
1871 * Create an UST session and add it to the session ust list.
1872 */
1873static int create_ust_session(struct ltt_session *session,
1874 struct lttng_domain *domain, struct ucred *creds)
1875{
1876 int ret;
1877 gid_t gid;
1878 struct ltt_ust_session *lus = NULL;
1879
1880 switch (domain->type) {
1881 case LTTNG_DOMAIN_UST:
1882 break;
1883 default:
1884 ret = LTTCOMM_UNKNOWN_DOMAIN;
1885 goto error;
1886 }
1887
1888 DBG("Creating UST session");
1889
1890 lus = trace_ust_create_session(session->path, session->id, domain);
1891 if (lus == NULL) {
1892 ret = LTTCOMM_UST_SESS_FAIL;
1893 goto error;
1894 }
1895
1896 /*
1897 * Get the right group ID. To use the tracing group, the daemon must be
1898 * running with root credentials or else it's the user GID used.
1899 */
1900 gid = allowed_group();
1901 if (gid < 0 || !is_root) {
1902 gid = creds->gid;
1903 }
1904
1905 ret = mkdir_recursive(lus->pathname, S_IRWXU | S_IRWXG, creds->uid, gid);
1906 if (ret < 0) {
1907 if (ret != -EEXIST) {
1908 ERR("Trace directory creation error");
1909 ret = LTTCOMM_UST_SESS_FAIL;
1910 goto error;
1911 }
1912 }
1913
1914 /* The domain type dictate different actions on session creation */
1915 switch (domain->type) {
1916 case LTTNG_DOMAIN_UST:
1917 /* No ustctl for the global UST domain */
1918 break;
1919 default:
1920 ERR("Unknown UST domain on create session %d", domain->type);
1921 goto error;
1922 }
1923 session->ust_session = lus;
1924
1925 return LTTCOMM_OK;
1926
1927error:
1928 free(lus);
1929 return ret;
1930}
1931
1932/*
1933 * Create a kernel tracer session then create the default channel.
1934 */
1935static int create_kernel_session(struct ltt_session *session,
1936 struct ucred *creds)
1937{
1938 int ret;
1939 gid_t gid;
1940
1941 DBG("Creating kernel session");
1942
1943 ret = kernel_create_session(session, kernel_tracer_fd);
1944 if (ret < 0) {
1945 ret = LTTCOMM_KERN_SESS_FAIL;
1946 goto error;
1947 }
1948
1949 /* Set kernel consumer socket fd */
1950 if (kconsumer_data.cmd_sock) {
1951 session->kernel_session->consumer_fd = kconsumer_data.cmd_sock;
1952 }
1953
1954 gid = allowed_group();
1955 if (gid < 0) {
1956 /*
1957 * Use GID 0 has a fallback since kernel session is only allowed under
1958 * root or the gid of the calling user
1959 */
1960 is_root ? (gid = 0) : (gid = creds->gid);
1961 }
1962
1963 ret = mkdir_recursive(session->kernel_session->trace_path,
1964 S_IRWXU | S_IRWXG, creds->uid, gid);
1965 if (ret < 0) {
1966 if (ret != -EEXIST) {
1967 ERR("Trace directory creation error");
1968 goto error;
1969 }
1970 }
1971
1972error:
1973 return ret;
1974}
1975
1976/*
1977 * Using the session list, filled a lttng_session array to send back to the
1978 * client for session listing.
1979 *
1980 * The session list lock MUST be acquired before calling this function. Use
1981 * session_lock_list() and session_unlock_list().
1982 */
1983static void list_lttng_sessions(struct lttng_session *sessions)
1984{
1985 int i = 0;
1986 struct ltt_session *session;
1987
1988 DBG("Getting all available session");
1989 /*
1990 * Iterate over session list and append data after the control struct in
1991 * the buffer.
1992 */
1993 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
1994 strncpy(sessions[i].path, session->path, PATH_MAX);
1995 sessions[i].path[PATH_MAX - 1] = '\0';
1996 strncpy(sessions[i].name, session->name, NAME_MAX);
1997 sessions[i].name[NAME_MAX - 1] = '\0';
1998 sessions[i].enabled = session->enabled;
1999 i++;
2000 }
2001}
2002
2003/*
2004 * Fill lttng_channel array of all channels.
2005 */
2006static void list_lttng_channels(int domain, struct ltt_session *session,
2007 struct lttng_channel *channels)
2008{
2009 int i = 0;
2010 struct ltt_kernel_channel *kchan;
2011
2012 DBG("Listing channels for session %s", session->name);
2013
2014 switch (domain) {
2015 case LTTNG_DOMAIN_KERNEL:
2016 /* Kernel channels */
2017 if (session->kernel_session != NULL) {
2018 cds_list_for_each_entry(kchan,
2019 &session->kernel_session->channel_list.head, list) {
2020 /* Copy lttng_channel struct to array */
2021 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
2022 channels[i].enabled = kchan->enabled;
2023 i++;
2024 }
2025 }
2026 break;
2027 case LTTNG_DOMAIN_UST:
2028 {
2029 struct cds_lfht_iter iter;
2030 struct ltt_ust_channel *uchan;
2031
2032 cds_lfht_for_each_entry(session->ust_session->domain_global.channels,
2033 &iter, uchan, node) {
2034 strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN);
2035 channels[i].attr.overwrite = uchan->attr.overwrite;
2036 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
2037 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
2038 channels[i].attr.switch_timer_interval =
2039 uchan->attr.switch_timer_interval;
2040 channels[i].attr.read_timer_interval =
2041 uchan->attr.read_timer_interval;
2042 channels[i].enabled = uchan->enabled;
2043 switch (uchan->attr.output) {
2044 case LTTNG_UST_MMAP:
2045 default:
2046 channels[i].attr.output = LTTNG_EVENT_MMAP;
2047 break;
2048 }
2049 i++;
2050 }
2051 break;
2052 }
2053 default:
2054 break;
2055 }
2056}
2057
2058/*
2059 * Create a list of ust global domain events.
2060 */
2061static int list_lttng_ust_global_events(char *channel_name,
2062 struct ltt_ust_domain_global *ust_global, struct lttng_event **events)
2063{
2064 int i = 0, ret = 0;
2065 unsigned int nb_event = 0;
2066 struct cds_lfht_iter iter;
2067 struct cds_lfht_node *node;
2068 struct ltt_ust_channel *uchan;
2069 struct ltt_ust_event *uevent;
2070 struct lttng_event *tmp;
2071
2072 DBG("Listing UST global events for channel %s", channel_name);
2073
2074 rcu_read_lock();
2075
2076 node = hashtable_lookup(ust_global->channels, (void *) channel_name,
2077 strlen(channel_name), &iter);
2078 if (node == NULL) {
2079 ret = -LTTCOMM_UST_CHAN_NOT_FOUND;
2080 goto error;
2081 }
2082
2083 uchan = caa_container_of(node, struct ltt_ust_channel, node);
2084
2085 nb_event += hashtable_get_count(uchan->events);
2086
2087 if (nb_event == 0) {
2088 ret = nb_event;
2089 goto error;
2090 }
2091
2092 DBG3("Listing UST global %d events", nb_event);
2093
2094 tmp = zmalloc(nb_event * sizeof(struct lttng_event));
2095 if (tmp == NULL) {
2096 ret = -LTTCOMM_FATAL;
2097 goto error;
2098 }
2099
2100 cds_lfht_for_each_entry(uchan->events, &iter, uevent, node) {
2101 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
2102 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2103 tmp[i].enabled = uevent->enabled;
2104 switch (uevent->attr.instrumentation) {
2105 case LTTNG_UST_TRACEPOINT:
2106 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
2107 break;
2108 case LTTNG_UST_PROBE:
2109 tmp[i].type = LTTNG_EVENT_PROBE;
2110 break;
2111 case LTTNG_UST_FUNCTION:
2112 tmp[i].type = LTTNG_EVENT_FUNCTION;
2113 break;
2114 case LTTNG_UST_TRACEPOINT_LOGLEVEL:
2115 tmp[i].type = LTTNG_EVENT_TRACEPOINT_LOGLEVEL;
2116 break;
2117 }
2118 i++;
2119 }
2120
2121 ret = nb_event;
2122 *events = tmp;
2123
2124error:
2125 rcu_read_unlock();
2126 return ret;
2127}
2128
2129/*
2130 * Fill lttng_event array of all kernel events in the channel.
2131 */
2132static int list_lttng_kernel_events(char *channel_name,
2133 struct ltt_kernel_session *kernel_session, struct lttng_event **events)
2134{
2135 int i = 0, ret;
2136 unsigned int nb_event;
2137 struct ltt_kernel_event *event;
2138 struct ltt_kernel_channel *kchan;
2139
2140 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
2141 if (kchan == NULL) {
2142 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2143 goto error;
2144 }
2145
2146 nb_event = kchan->event_count;
2147
2148 DBG("Listing events for channel %s", kchan->channel->name);
2149
2150 if (nb_event == 0) {
2151 ret = nb_event;
2152 goto error;
2153 }
2154
2155 *events = zmalloc(nb_event * sizeof(struct lttng_event));
2156 if (*events == NULL) {
2157 ret = LTTCOMM_FATAL;
2158 goto error;
2159 }
2160
2161 /* Kernel channels */
2162 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
2163 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
2164 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2165 (*events)[i].enabled = event->enabled;
2166 switch (event->event->instrumentation) {
2167 case LTTNG_KERNEL_TRACEPOINT:
2168 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
2169 break;
2170 case LTTNG_KERNEL_KPROBE:
2171 case LTTNG_KERNEL_KRETPROBE:
2172 (*events)[i].type = LTTNG_EVENT_PROBE;
2173 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
2174 sizeof(struct lttng_kernel_kprobe));
2175 break;
2176 case LTTNG_KERNEL_FUNCTION:
2177 (*events)[i].type = LTTNG_EVENT_FUNCTION;
2178 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
2179 sizeof(struct lttng_kernel_function));
2180 break;
2181 case LTTNG_KERNEL_NOOP:
2182 (*events)[i].type = LTTNG_EVENT_NOOP;
2183 break;
2184 case LTTNG_KERNEL_SYSCALL:
2185 (*events)[i].type = LTTNG_EVENT_SYSCALL;
2186 break;
2187 case LTTNG_KERNEL_ALL:
2188 assert(0);
2189 break;
2190 }
2191 i++;
2192 }
2193
2194 return nb_event;
2195
2196error:
2197 return ret;
2198}
2199
2200/*
2201 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
2202 */
2203static int cmd_disable_channel(struct ltt_session *session,
2204 int domain, char *channel_name)
2205{
2206 int ret;
2207 struct ltt_ust_session *usess;
2208
2209 usess = session->ust_session;
2210
2211 switch (domain) {
2212 case LTTNG_DOMAIN_KERNEL:
2213 {
2214 ret = channel_kernel_disable(session->kernel_session,
2215 channel_name);
2216 if (ret != LTTCOMM_OK) {
2217 goto error;
2218 }
2219
2220 kernel_wait_quiescent(kernel_tracer_fd);
2221 break;
2222 }
2223 case LTTNG_DOMAIN_UST:
2224 {
2225 struct ltt_ust_channel *uchan;
2226 struct cds_lfht *chan_ht;
2227
2228 chan_ht = usess->domain_global.channels;
2229
2230 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
2231 if (uchan == NULL) {
2232 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2233 goto error;
2234 }
2235
2236 ret = channel_ust_disable(usess, domain, uchan);
2237 if (ret != LTTCOMM_OK) {
2238 goto error;
2239 }
2240 break;
2241 }
2242 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2243 case LTTNG_DOMAIN_UST_EXEC_NAME:
2244 case LTTNG_DOMAIN_UST_PID:
2245 ret = LTTCOMM_NOT_IMPLEMENTED;
2246 goto error;
2247 default:
2248 ret = LTTCOMM_UNKNOWN_DOMAIN;
2249 goto error;
2250 }
2251
2252 ret = LTTCOMM_OK;
2253
2254error:
2255 return ret;
2256}
2257
2258/*
2259 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
2260 */
2261static int cmd_enable_channel(struct ltt_session *session,
2262 int domain, struct lttng_channel *attr)
2263{
2264 int ret;
2265 struct ltt_ust_session *usess = session->ust_session;
2266 struct cds_lfht *chan_ht;
2267
2268 DBG("Enabling channel %s for session %s", attr->name, session->name);
2269
2270 switch (domain) {
2271 case LTTNG_DOMAIN_KERNEL:
2272 {
2273 struct ltt_kernel_channel *kchan;
2274
2275 kchan = trace_kernel_get_channel_by_name(attr->name,
2276 session->kernel_session);
2277 if (kchan == NULL) {
2278 ret = channel_kernel_create(session->kernel_session,
2279 attr, kernel_poll_pipe[1]);
2280 } else {
2281 ret = channel_kernel_enable(session->kernel_session, kchan);
2282 }
2283
2284 if (ret != LTTCOMM_OK) {
2285 goto error;
2286 }
2287
2288 kernel_wait_quiescent(kernel_tracer_fd);
2289 break;
2290 }
2291 case LTTNG_DOMAIN_UST:
2292 {
2293 struct ltt_ust_channel *uchan;
2294
2295 chan_ht = usess->domain_global.channels;
2296
2297 uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
2298 if (uchan == NULL) {
2299 ret = channel_ust_create(usess, domain, attr);
2300 } else {
2301 ret = channel_ust_enable(usess, domain, uchan);
2302 }
2303 break;
2304 }
2305 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2306 case LTTNG_DOMAIN_UST_EXEC_NAME:
2307 case LTTNG_DOMAIN_UST_PID:
2308 ret = LTTCOMM_NOT_IMPLEMENTED;
2309 goto error;
2310 default:
2311 ret = LTTCOMM_UNKNOWN_DOMAIN;
2312 goto error;
2313 }
2314
2315error:
2316 return ret;
2317}
2318
2319/*
2320 * Command LTTNG_DISABLE_EVENT processed by the client thread.
2321 */
2322static int cmd_disable_event(struct ltt_session *session, int domain,
2323 char *channel_name, char *event_name)
2324{
2325 int ret;
2326
2327 switch (domain) {
2328 case LTTNG_DOMAIN_KERNEL:
2329 {
2330 struct ltt_kernel_channel *kchan;
2331 struct ltt_kernel_session *ksess;
2332
2333 ksess = session->kernel_session;
2334
2335 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
2336 if (kchan == NULL) {
2337 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2338 goto error;
2339 }
2340
2341 ret = event_kernel_disable_tracepoint(ksess, kchan, event_name);
2342 if (ret != LTTCOMM_OK) {
2343 goto error;
2344 }
2345
2346 kernel_wait_quiescent(kernel_tracer_fd);
2347 break;
2348 }
2349 case LTTNG_DOMAIN_UST:
2350 {
2351 struct ltt_ust_channel *uchan;
2352 struct ltt_ust_session *usess;
2353
2354 usess = session->ust_session;
2355
2356 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2357 channel_name);
2358 if (uchan == NULL) {
2359 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2360 goto error;
2361 }
2362
2363 ret = event_ust_disable_tracepoint(usess, domain, uchan, event_name);
2364 if (ret != LTTCOMM_OK) {
2365 goto error;
2366 }
2367
2368 DBG3("Disable UST event %s in channel %s completed", event_name,
2369 channel_name);
2370 break;
2371 }
2372 case LTTNG_DOMAIN_UST_EXEC_NAME:
2373 case LTTNG_DOMAIN_UST_PID:
2374 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2375 default:
2376 ret = LTTCOMM_NOT_IMPLEMENTED;
2377 goto error;
2378 }
2379
2380 ret = LTTCOMM_OK;
2381
2382error:
2383 return ret;
2384}
2385
2386/*
2387 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
2388 */
2389static int cmd_disable_event_all(struct ltt_session *session, int domain,
2390 char *channel_name)
2391{
2392 int ret;
2393
2394 switch (domain) {
2395 case LTTNG_DOMAIN_KERNEL:
2396 {
2397 struct ltt_kernel_session *ksess;
2398 struct ltt_kernel_channel *kchan;
2399
2400 ksess = session->kernel_session;
2401
2402 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
2403 if (kchan == NULL) {
2404 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2405 goto error;
2406 }
2407
2408 ret = event_kernel_disable_all(ksess, kchan);
2409 if (ret != LTTCOMM_OK) {
2410 goto error;
2411 }
2412
2413 kernel_wait_quiescent(kernel_tracer_fd);
2414 break;
2415 }
2416 case LTTNG_DOMAIN_UST:
2417 {
2418 struct ltt_ust_session *usess;
2419 struct ltt_ust_channel *uchan;
2420
2421 usess = session->ust_session;
2422
2423 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2424 channel_name);
2425 if (uchan == NULL) {
2426 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2427 goto error;
2428 }
2429
2430 ret = event_ust_disable_all_tracepoints(usess, domain, uchan);
2431 if (ret != 0) {
2432 goto error;
2433 }
2434
2435 DBG3("Disable all UST events in channel %s completed", channel_name);
2436
2437 break;
2438 }
2439 case LTTNG_DOMAIN_UST_EXEC_NAME:
2440 case LTTNG_DOMAIN_UST_PID:
2441 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2442 default:
2443 ret = LTTCOMM_NOT_IMPLEMENTED;
2444 goto error;
2445 }
2446
2447 ret = LTTCOMM_OK;
2448
2449error:
2450 return ret;
2451}
2452
2453/*
2454 * Command LTTNG_ADD_CONTEXT processed by the client thread.
2455 */
2456static int cmd_add_context(struct ltt_session *session, int domain,
2457 char *channel_name, char *event_name, struct lttng_event_context *ctx)
2458{
2459 int ret;
2460
2461 switch (domain) {
2462 case LTTNG_DOMAIN_KERNEL:
2463 /* Add kernel context to kernel tracer */
2464 ret = context_kernel_add(session->kernel_session, ctx,
2465 event_name, channel_name);
2466 if (ret != LTTCOMM_OK) {
2467 goto error;
2468 }
2469 break;
2470 case LTTNG_DOMAIN_UST:
2471 {
2472 struct ltt_ust_session *usess = session->ust_session;
2473
2474 ret = context_ust_add(usess, domain, ctx, event_name, channel_name);
2475 if (ret != LTTCOMM_OK) {
2476 goto error;
2477 }
2478 break;
2479 }
2480 case LTTNG_DOMAIN_UST_EXEC_NAME:
2481 case LTTNG_DOMAIN_UST_PID:
2482 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2483 default:
2484 ret = LTTCOMM_NOT_IMPLEMENTED;
2485 goto error;
2486 }
2487
2488 ret = LTTCOMM_OK;
2489
2490error:
2491 return ret;
2492}
2493
2494/*
2495 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2496 *
2497 * TODO: currently, both events and loglevels are kept within the same
2498 * namespace for UST global registry/app registery, so if an event
2499 * happen to have the same name as the loglevel (very unlikely though),
2500 * and an attempt is made to enable/disable both in the same session,
2501 * the first to be created will be the only one allowed to exist.
2502 */
2503static int cmd_enable_event(struct ltt_session *session, int domain,
2504 char *channel_name, struct lttng_event *event)
2505{
2506 int ret;
2507 struct lttng_channel *attr;
2508 struct ltt_ust_session *usess = session->ust_session;
2509
2510 switch (domain) {
2511 case LTTNG_DOMAIN_KERNEL:
2512 {
2513 struct ltt_kernel_channel *kchan;
2514
2515 kchan = trace_kernel_get_channel_by_name(channel_name,
2516 session->kernel_session);
2517 if (kchan == NULL) {
2518 attr = channel_new_default_attr(domain);
2519 if (attr == NULL) {
2520 ret = LTTCOMM_FATAL;
2521 goto error;
2522 }
2523 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2524
2525 /* This call will notify the kernel thread */
2526 ret = channel_kernel_create(session->kernel_session,
2527 attr, kernel_poll_pipe[1]);
2528 if (ret != LTTCOMM_OK) {
2529 free(attr);
2530 goto error;
2531 }
2532 free(attr);
2533 }
2534
2535 /* Get the newly created kernel channel pointer */
2536 kchan = trace_kernel_get_channel_by_name(channel_name,
2537 session->kernel_session);
2538 if (kchan == NULL) {
2539 /* This sould not happen... */
2540 ret = LTTCOMM_FATAL;
2541 goto error;
2542 }
2543
2544 ret = event_kernel_enable_tracepoint(session->kernel_session, kchan,
2545 event);
2546 if (ret != LTTCOMM_OK) {
2547 goto error;
2548 }
2549
2550 kernel_wait_quiescent(kernel_tracer_fd);
2551 break;
2552 }
2553 case LTTNG_DOMAIN_UST:
2554 {
2555 struct lttng_channel *attr;
2556 struct ltt_ust_channel *uchan;
2557
2558 /* Get channel from global UST domain */
2559 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2560 channel_name);
2561 if (uchan == NULL) {
2562 /* Create default channel */
2563 attr = channel_new_default_attr(domain);
2564 if (attr == NULL) {
2565 ret = LTTCOMM_FATAL;
2566 goto error;
2567 }
2568 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2569 attr->name[NAME_MAX - 1] = '\0';
2570
2571 ret = channel_ust_create(usess, domain, attr);
2572 if (ret != LTTCOMM_OK) {
2573 free(attr);
2574 goto error;
2575 }
2576 free(attr);
2577
2578 /* Get the newly created channel reference back */
2579 uchan = trace_ust_find_channel_by_name(
2580 usess->domain_global.channels, channel_name);
2581 if (uchan == NULL) {
2582 /* Something is really wrong */
2583 ret = LTTCOMM_FATAL;
2584 goto error;
2585 }
2586 }
2587
2588 /* At this point, the session and channel exist on the tracer */
2589
2590 ret = event_ust_enable_tracepoint(usess, domain, uchan, event);
2591 if (ret != LTTCOMM_OK) {
2592 goto error;
2593 }
2594 break;
2595 }
2596 case LTTNG_DOMAIN_UST_EXEC_NAME:
2597 case LTTNG_DOMAIN_UST_PID:
2598 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2599 default:
2600 ret = LTTCOMM_NOT_IMPLEMENTED;
2601 goto error;
2602 }
2603
2604 ret = LTTCOMM_OK;
2605
2606error:
2607 return ret;
2608}
2609
2610/*
2611 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
2612 */
2613static int cmd_enable_event_all(struct ltt_session *session, int domain,
2614 char *channel_name, int event_type)
2615{
2616 int ret;
2617 struct ltt_kernel_channel *kchan;
2618
2619 switch (domain) {
2620 case LTTNG_DOMAIN_KERNEL:
2621 kchan = trace_kernel_get_channel_by_name(channel_name,
2622 session->kernel_session);
2623 if (kchan == NULL) {
2624 /* This call will notify the kernel thread */
2625 ret = channel_kernel_create(session->kernel_session, NULL,
2626 kernel_poll_pipe[1]);
2627 if (ret != LTTCOMM_OK) {
2628 goto error;
2629 }
2630
2631 /* Get the newly created kernel channel pointer */
2632 kchan = trace_kernel_get_channel_by_name(channel_name,
2633 session->kernel_session);
2634 if (kchan == NULL) {
2635 /* This sould not happen... */
2636 ret = LTTCOMM_FATAL;
2637 goto error;
2638 }
2639
2640 }
2641
2642 switch (event_type) {
2643 case LTTNG_EVENT_SYSCALL:
2644 ret = event_kernel_enable_all_syscalls(session->kernel_session,
2645 kchan, kernel_tracer_fd);
2646 break;
2647 case LTTNG_EVENT_TRACEPOINT:
2648 /*
2649 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
2650 * events already registered to the channel.
2651 */
2652 ret = event_kernel_enable_all_tracepoints(session->kernel_session,
2653 kchan, kernel_tracer_fd);
2654 break;
2655 case LTTNG_EVENT_ALL:
2656 /* Enable syscalls and tracepoints */
2657 ret = event_kernel_enable_all(session->kernel_session,
2658 kchan, kernel_tracer_fd);
2659 break;
2660 default:
2661 ret = LTTCOMM_KERN_ENABLE_FAIL;
2662 goto error;
2663 }
2664
2665 /* Manage return value */
2666 if (ret != LTTCOMM_OK) {
2667 goto error;
2668 }
2669
2670 kernel_wait_quiescent(kernel_tracer_fd);
2671 break;
2672 case LTTNG_DOMAIN_UST:
2673 {
2674 struct lttng_channel *attr;
2675 struct ltt_ust_channel *uchan;
2676 struct ltt_ust_session *usess = session->ust_session;
2677
2678 /* Get channel from global UST domain */
2679 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2680 channel_name);
2681 if (uchan == NULL) {
2682 /* Create default channel */
2683 attr = channel_new_default_attr(domain);
2684 if (attr == NULL) {
2685 ret = LTTCOMM_FATAL;
2686 goto error;
2687 }
2688 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2689 attr->name[NAME_MAX - 1] = '\0';
2690
2691 /* Use the internal command enable channel */
2692 ret = channel_ust_create(usess, domain, attr);
2693 if (ret != LTTCOMM_OK) {
2694 free(attr);
2695 goto error;
2696 }
2697 free(attr);
2698
2699 /* Get the newly created channel reference back */
2700 uchan = trace_ust_find_channel_by_name(
2701 usess->domain_global.channels, channel_name);
2702 if (uchan == NULL) {
2703 /* Something is really wrong */
2704 ret = LTTCOMM_FATAL;
2705 goto error;
2706 }
2707 }
2708
2709 /* At this point, the session and channel exist on the tracer */
2710
2711 switch (event_type) {
2712 case LTTNG_EVENT_ALL:
2713 case LTTNG_EVENT_TRACEPOINT:
2714 ret = event_ust_enable_all_tracepoints(usess, domain, uchan);
2715 if (ret != LTTCOMM_OK) {
2716 goto error;
2717 }
2718 break;
2719 default:
2720 ret = LTTCOMM_UST_ENABLE_FAIL;
2721 goto error;
2722 }
2723
2724 /* Manage return value */
2725 if (ret != LTTCOMM_OK) {
2726 goto error;
2727 }
2728
2729 break;
2730 }
2731 case LTTNG_DOMAIN_UST_EXEC_NAME:
2732 case LTTNG_DOMAIN_UST_PID:
2733 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2734 default:
2735 ret = LTTCOMM_NOT_IMPLEMENTED;
2736 goto error;
2737 }
2738
2739 ret = LTTCOMM_OK;
2740
2741error:
2742 return ret;
2743}
2744
2745/*
2746 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2747 */
2748static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
2749{
2750 int ret;
2751 ssize_t nb_events = 0;
2752
2753 switch (domain) {
2754 case LTTNG_DOMAIN_KERNEL:
2755 nb_events = kernel_list_events(kernel_tracer_fd, events);
2756 if (nb_events < 0) {
2757 ret = LTTCOMM_KERN_LIST_FAIL;
2758 goto error;
2759 }
2760 break;
2761 case LTTNG_DOMAIN_UST:
2762 nb_events = ust_app_list_events(events);
2763 if (nb_events < 0) {
2764 ret = LTTCOMM_UST_LIST_FAIL;
2765 goto error;
2766 }
2767 break;
2768 default:
2769 ret = LTTCOMM_NOT_IMPLEMENTED;
2770 goto error;
2771 }
2772
2773 return nb_events;
2774
2775error:
2776 /* Return negative value to differentiate return code */
2777 return -ret;
2778}
2779
2780/*
2781 * Command LTTNG_START_TRACE processed by the client thread.
2782 */
2783static int cmd_start_trace(struct ltt_session *session)
2784{
2785 int ret;
2786 struct ltt_kernel_session *ksession;
2787 struct ltt_ust_session *usess;
2788
2789 /* Short cut */
2790 ksession = session->kernel_session;
2791 usess = session->ust_session;
2792
2793 if (session->enabled) {
2794 ret = LTTCOMM_UST_START_FAIL;
2795 goto error;
2796 }
2797
2798 session->enabled = 1;
2799
2800 /* Kernel tracing */
2801 if (ksession != NULL) {
2802 struct ltt_kernel_channel *kchan;
2803
2804 /* Open kernel metadata */
2805 if (ksession->metadata == NULL) {
2806 ret = kernel_open_metadata(ksession, ksession->trace_path);
2807 if (ret < 0) {
2808 ret = LTTCOMM_KERN_META_FAIL;
2809 goto error;
2810 }
2811 }
2812
2813 /* Open kernel metadata stream */
2814 if (ksession->metadata_stream_fd == 0) {
2815 ret = kernel_open_metadata_stream(ksession);
2816 if (ret < 0) {
2817 ERR("Kernel create metadata stream failed");
2818 ret = LTTCOMM_KERN_STREAM_FAIL;
2819 goto error;
2820 }
2821 }
2822
2823 /* For each channel */
2824 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2825 if (kchan->stream_count == 0) {
2826 ret = kernel_open_channel_stream(kchan);
2827 if (ret < 0) {
2828 ret = LTTCOMM_KERN_STREAM_FAIL;
2829 goto error;
2830 }
2831 /* Update the stream global counter */
2832 ksession->stream_count_global += ret;
2833 }
2834 }
2835
2836 /* Setup kernel consumer socket and send fds to it */
2837 ret = init_kernel_tracing(ksession);
2838 if (ret < 0) {
2839 ret = LTTCOMM_KERN_START_FAIL;
2840 goto error;
2841 }
2842
2843 /* This start the kernel tracing */
2844 ret = kernel_start_session(ksession);
2845 if (ret < 0) {
2846 ret = LTTCOMM_KERN_START_FAIL;
2847 goto error;
2848 }
2849
2850 /* Quiescent wait after starting trace */
2851 kernel_wait_quiescent(kernel_tracer_fd);
2852 }
2853
2854 /* Flag session that trace should start automatically */
2855 if (usess) {
2856 usess->start_trace = 1;
2857
2858 ret = ust_app_start_trace_all(usess);
2859 if (ret < 0) {
2860 ret = LTTCOMM_UST_START_FAIL;
2861 goto error;
2862 }
2863 }
2864
2865 ret = LTTCOMM_OK;
2866
2867error:
2868 return ret;
2869}
2870
2871/*
2872 * Command LTTNG_STOP_TRACE processed by the client thread.
2873 */
2874static int cmd_stop_trace(struct ltt_session *session)
2875{
2876 int ret;
2877 struct ltt_kernel_channel *kchan;
2878 struct ltt_kernel_session *ksession;
2879 struct ltt_ust_session *usess;
2880
2881 /* Short cut */
2882 ksession = session->kernel_session;
2883 usess = session->ust_session;
2884
2885 if (!session->enabled) {
2886 ret = LTTCOMM_UST_START_FAIL;
2887 goto error;
2888 }
2889
2890 session->enabled = 0;
2891
2892 /* Kernel tracer */
2893 if (ksession != NULL) {
2894 DBG("Stop kernel tracing");
2895
2896 /* Flush all buffers before stopping */
2897 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
2898 if (ret < 0) {
2899 ERR("Kernel metadata flush failed");
2900 }
2901
2902 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2903 ret = kernel_flush_buffer(kchan);
2904 if (ret < 0) {
2905 ERR("Kernel flush buffer error");
2906 }
2907 }
2908
2909 ret = kernel_stop_session(ksession);
2910 if (ret < 0) {
2911 ret = LTTCOMM_KERN_STOP_FAIL;
2912 goto error;
2913 }
2914
2915 kernel_wait_quiescent(kernel_tracer_fd);
2916 }
2917
2918 if (usess) {
2919 usess->start_trace = 0;
2920
2921 ret = ust_app_stop_trace_all(usess);
2922 if (ret < 0) {
2923 ret = LTTCOMM_UST_START_FAIL;
2924 goto error;
2925 }
2926 }
2927
2928 ret = LTTCOMM_OK;
2929
2930error:
2931 return ret;
2932}
2933
2934/*
2935 * Command LTTNG_CREATE_SESSION processed by the client thread.
2936 */
2937static int cmd_create_session(char *name, char *path)
2938{
2939 int ret;
2940
2941 ret = session_create(name, path);
2942 if (ret != LTTCOMM_OK) {
2943 goto error;
2944 }
2945
2946 ret = LTTCOMM_OK;
2947
2948error:
2949 return ret;
2950}
2951
2952/*
2953 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2954 */
2955static int cmd_destroy_session(struct ltt_session *session, char *name)
2956{
2957 int ret;
2958
2959 /* Clean kernel session teardown */
2960 teardown_kernel_session(session);
2961 /* UST session teardown */
2962 teardown_ust_session(session);
2963
2964 /*
2965 * Must notify the kernel thread here to update it's poll setin order
2966 * to remove the channel(s)' fd just destroyed.
2967 */
2968 ret = notify_thread_pipe(kernel_poll_pipe[1]);
2969 if (ret < 0) {
2970 perror("write kernel poll pipe");
2971 }
2972
2973 ret = session_destroy(session);
2974
2975 return ret;
2976}
2977
2978/*
2979 * Command LTTNG_CALIBRATE processed by the client thread.
2980 */
2981static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
2982{
2983 int ret;
2984
2985 switch (domain) {
2986 case LTTNG_DOMAIN_KERNEL:
2987 {
2988 struct lttng_kernel_calibrate kcalibrate;
2989
2990 kcalibrate.type = calibrate->type;
2991 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
2992 if (ret < 0) {
2993 ret = LTTCOMM_KERN_ENABLE_FAIL;
2994 goto error;
2995 }
2996 break;
2997 }
2998 default:
2999 /* TODO: Userspace tracing */
3000 ret = LTTCOMM_NOT_IMPLEMENTED;
3001 goto error;
3002 }
3003
3004 ret = LTTCOMM_OK;
3005
3006error:
3007 return ret;
3008}
3009
3010/*
3011 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
3012 */
3013static int cmd_register_consumer(struct ltt_session *session, int domain,
3014 char *sock_path)
3015{
3016 int ret, sock;
3017
3018 switch (domain) {
3019 case LTTNG_DOMAIN_KERNEL:
3020 /* Can't register a consumer if there is already one */
3021 if (session->kernel_session->consumer_fds_sent != 0) {
3022 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3023 goto error;
3024 }
3025
3026 sock = lttcomm_connect_unix_sock(sock_path);
3027 if (sock < 0) {
3028 ret = LTTCOMM_CONNECT_FAIL;
3029 goto error;
3030 }
3031
3032 session->kernel_session->consumer_fd = sock;
3033 break;
3034 default:
3035 /* TODO: Userspace tracing */
3036 ret = LTTCOMM_NOT_IMPLEMENTED;
3037 goto error;
3038 }
3039
3040 ret = LTTCOMM_OK;
3041
3042error:
3043 return ret;
3044}
3045
3046/*
3047 * Command LTTNG_LIST_DOMAINS processed by the client thread.
3048 */
3049static ssize_t cmd_list_domains(struct ltt_session *session,
3050 struct lttng_domain **domains)
3051{
3052 int ret, index = 0;
3053 ssize_t nb_dom = 0;
3054
3055 if (session->kernel_session != NULL) {
3056 DBG3("Listing domains found kernel domain");
3057 nb_dom++;
3058 }
3059
3060 if (session->ust_session != NULL) {
3061 DBG3("Listing domains found UST global domain");
3062 nb_dom++;
3063 }
3064
3065 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
3066 if (*domains == NULL) {
3067 ret = -LTTCOMM_FATAL;
3068 goto error;
3069 }
3070
3071 if (session->kernel_session != NULL) {
3072 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
3073 index++;
3074 }
3075
3076 if (session->ust_session != NULL) {
3077 (*domains)[index].type = LTTNG_DOMAIN_UST;
3078 index++;
3079 }
3080
3081 return nb_dom;
3082
3083error:
3084 return ret;
3085}
3086
3087/*
3088 * Command LTTNG_LIST_CHANNELS processed by the client thread.
3089 */
3090static ssize_t cmd_list_channels(int domain, struct ltt_session *session,
3091 struct lttng_channel **channels)
3092{
3093 int ret;
3094 ssize_t nb_chan = 0;
3095
3096 switch (domain) {
3097 case LTTNG_DOMAIN_KERNEL:
3098 if (session->kernel_session != NULL) {
3099 nb_chan = session->kernel_session->channel_count;
3100 }
3101 DBG3("Number of kernel channels %zd", nb_chan);
3102 break;
3103 case LTTNG_DOMAIN_UST:
3104 if (session->ust_session != NULL) {
3105 nb_chan = hashtable_get_count(
3106 session->ust_session->domain_global.channels);
3107 }
3108 DBG3("Number of UST global channels %zd", nb_chan);
3109 break;
3110 default:
3111 *channels = NULL;
3112 ret = -LTTCOMM_NOT_IMPLEMENTED;
3113 goto error;
3114 }
3115
3116 if (nb_chan > 0) {
3117 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
3118 if (*channels == NULL) {
3119 ret = -LTTCOMM_FATAL;
3120 goto error;
3121 }
3122
3123 list_lttng_channels(domain, session, *channels);
3124 } else {
3125 *channels = NULL;
3126 }
3127
3128 return nb_chan;
3129
3130error:
3131 return ret;
3132}
3133
3134/*
3135 * Command LTTNG_LIST_EVENTS processed by the client thread.
3136 */
3137static ssize_t cmd_list_events(int domain, struct ltt_session *session,
3138 char *channel_name, struct lttng_event **events)
3139{
3140 int ret = 0;
3141 ssize_t nb_event = 0;
3142
3143 switch (domain) {
3144 case LTTNG_DOMAIN_KERNEL:
3145 if (session->kernel_session != NULL) {
3146 nb_event = list_lttng_kernel_events(channel_name,
3147 session->kernel_session, events);
3148 }
3149 break;
3150 case LTTNG_DOMAIN_UST:
3151 {
3152 if (session->ust_session != NULL) {
3153 nb_event = list_lttng_ust_global_events(channel_name,
3154 &session->ust_session->domain_global, events);
3155 }
3156 break;
3157 }
3158 default:
3159 ret = -LTTCOMM_NOT_IMPLEMENTED;
3160 goto error;
3161 }
3162
3163 ret = nb_event;
3164
3165error:
3166 return ret;
3167}
3168
3169/*
3170 * Process the command requested by the lttng client within the command
3171 * context structure. This function make sure that the return structure (llm)
3172 * is set and ready for transmission before returning.
3173 *
3174 * Return any error encountered or 0 for success.
3175 */
3176static int process_client_msg(struct command_ctx *cmd_ctx)
3177{
3178 int ret = LTTCOMM_OK;
3179 int need_tracing_session = 1;
3180
3181 DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
3182
3183 if (opt_no_kernel && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) {
3184 ret = LTTCOMM_KERN_NA;
3185 goto error;
3186 }
3187
3188 /*
3189 * Check for command that don't needs to allocate a returned payload. We do
3190 * this here so we don't have to make the call for no payload at each
3191 * command.
3192 */
3193 switch(cmd_ctx->lsm->cmd_type) {
3194 case LTTNG_LIST_SESSIONS:
3195 case LTTNG_LIST_TRACEPOINTS:
3196 case LTTNG_LIST_DOMAINS:
3197 case LTTNG_LIST_CHANNELS:
3198 case LTTNG_LIST_EVENTS:
3199 break;
3200 default:
3201 /* Setup lttng message with no payload */
3202 ret = setup_lttng_msg(cmd_ctx, 0);
3203 if (ret < 0) {
3204 /* This label does not try to unlock the session */
3205 goto init_setup_error;
3206 }
3207 }
3208
3209 /* Commands that DO NOT need a session. */
3210 switch (cmd_ctx->lsm->cmd_type) {
3211 case LTTNG_CALIBRATE:
3212 case LTTNG_CREATE_SESSION:
3213 case LTTNG_LIST_SESSIONS:
3214 case LTTNG_LIST_TRACEPOINTS:
3215 need_tracing_session = 0;
3216 break;
3217 default:
3218 DBG("Getting session %s by name", cmd_ctx->lsm->session.name);
3219 session_lock_list();
3220 cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name);
3221 session_unlock_list();
3222 if (cmd_ctx->session == NULL) {
3223 if (cmd_ctx->lsm->session.name != NULL) {
3224 ret = LTTCOMM_SESS_NOT_FOUND;
3225 } else {
3226 /* If no session name specified */
3227 ret = LTTCOMM_SELECT_SESS;
3228 }
3229 goto error;
3230 } else {
3231 /* Acquire lock for the session */
3232 session_lock(cmd_ctx->session);
3233 }
3234 break;
3235 }
3236
3237 /*
3238 * Check domain type for specific "pre-action".
3239 */
3240 switch (cmd_ctx->lsm->domain.type) {
3241 case LTTNG_DOMAIN_KERNEL:
3242 /* Kernel tracer check */
3243 if (kernel_tracer_fd == 0) {
3244 /* Basically, load kernel tracer modules */
3245 init_kernel_tracer();
3246 if (kernel_tracer_fd == 0) {
3247 ret = LTTCOMM_KERN_NA;
3248 goto error;
3249 }
3250 }
3251
3252 /* Need a session for kernel command */
3253 if (need_tracing_session) {
3254 if (cmd_ctx->session->kernel_session == NULL) {
3255 ret = create_kernel_session(cmd_ctx->session, &cmd_ctx->creds);
3256 if (ret < 0) {
3257 ret = LTTCOMM_KERN_SESS_FAIL;
3258 goto error;
3259 }
3260 }
3261
3262 /* Start the kernel consumer daemon */
3263 pthread_mutex_lock(&kconsumer_data.pid_mutex);
3264 if (kconsumer_data.pid == 0 &&
3265 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3266 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
3267 ret = start_consumerd(&kconsumer_data);
3268 if (ret < 0) {
3269 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3270 goto error;
3271 }
3272 } else {
3273 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
3274 }
3275 }
3276 break;
3277 case LTTNG_DOMAIN_UST:
3278 {
3279 if (need_tracing_session) {
3280 if (cmd_ctx->session->ust_session == NULL) {
3281 ret = create_ust_session(cmd_ctx->session,
3282 &cmd_ctx->lsm->domain, &cmd_ctx->creds);
3283 if (ret != LTTCOMM_OK) {
3284 goto error;
3285 }
3286 }
3287 /* Start the UST consumer daemons */
3288 /* 64-bit */
3289 pthread_mutex_lock(&ustconsumer64_data.pid_mutex);
3290 if (consumerd64_bin[0] != '\0' &&
3291 ustconsumer64_data.pid == 0 &&
3292 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3293 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3294 ret = start_consumerd(&ustconsumer64_data);
3295 if (ret < 0) {
3296 ret = LTTCOMM_UST_CONSUMER64_FAIL;
3297 ust_consumerd64_fd = -EINVAL;
3298 goto error;
3299 }
3300
3301 ust_consumerd64_fd = ustconsumer64_data.cmd_sock;
3302 } else {
3303 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3304 }
3305 /* 32-bit */
3306 if (consumerd32_bin[0] != '\0' &&
3307 ustconsumer32_data.pid == 0 &&
3308 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3309 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
3310 ret = start_consumerd(&ustconsumer32_data);
3311 if (ret < 0) {
3312 ret = LTTCOMM_UST_CONSUMER32_FAIL;
3313 ust_consumerd32_fd = -EINVAL;
3314 goto error;
3315 }
3316 ust_consumerd32_fd = ustconsumer32_data.cmd_sock;
3317 } else {
3318 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
3319 }
3320 }
3321 break;
3322 }
3323 default:
3324 break;
3325 }
3326
3327 /* Process by command type */
3328 switch (cmd_ctx->lsm->cmd_type) {
3329 case LTTNG_ADD_CONTEXT:
3330 {
3331 ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3332 cmd_ctx->lsm->u.context.channel_name,
3333 cmd_ctx->lsm->u.context.event_name,
3334 &cmd_ctx->lsm->u.context.ctx);
3335 break;
3336 }
3337 case LTTNG_DISABLE_CHANNEL:
3338 {
3339 ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3340 cmd_ctx->lsm->u.disable.channel_name);
3341 break;
3342 }
3343 case LTTNG_DISABLE_EVENT:
3344 {
3345 ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3346 cmd_ctx->lsm->u.disable.channel_name,
3347 cmd_ctx->lsm->u.disable.name);
3348 ret = LTTCOMM_OK;
3349 break;
3350 }
3351 case LTTNG_DISABLE_ALL_EVENT:
3352 {
3353 DBG("Disabling all events");
3354
3355 ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3356 cmd_ctx->lsm->u.disable.channel_name);
3357 break;
3358 }
3359 case LTTNG_ENABLE_CHANNEL:
3360 {
3361 ret = cmd_enable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3362 &cmd_ctx->lsm->u.channel.chan);
3363 break;
3364 }
3365 case LTTNG_ENABLE_EVENT:
3366 {
3367 ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3368 cmd_ctx->lsm->u.enable.channel_name,
3369 &cmd_ctx->lsm->u.enable.event);
3370 break;
3371 }
3372 case LTTNG_ENABLE_ALL_EVENT:
3373 {
3374 DBG("Enabling all events");
3375
3376 ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3377 cmd_ctx->lsm->u.enable.channel_name,
3378 cmd_ctx->lsm->u.enable.event.type);
3379 break;
3380 }
3381 case LTTNG_LIST_TRACEPOINTS:
3382 {
3383 struct lttng_event *events;
3384 ssize_t nb_events;
3385
3386 nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events);
3387 if (nb_events < 0) {
3388 ret = -nb_events;
3389 goto error;
3390 }
3391
3392 /*
3393 * Setup lttng message with payload size set to the event list size in
3394 * bytes and then copy list into the llm payload.
3395 */
3396 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events);
3397 if (ret < 0) {
3398 free(events);
3399 goto setup_error;
3400 }
3401
3402 /* Copy event list into message payload */
3403 memcpy(cmd_ctx->llm->payload, events,
3404 sizeof(struct lttng_event) * nb_events);
3405
3406 free(events);
3407
3408 ret = LTTCOMM_OK;
3409 break;
3410 }
3411 case LTTNG_START_TRACE:
3412 {
3413 ret = cmd_start_trace(cmd_ctx->session);
3414 break;
3415 }
3416 case LTTNG_STOP_TRACE:
3417 {
3418 ret = cmd_stop_trace(cmd_ctx->session);
3419 break;
3420 }
3421 case LTTNG_CREATE_SESSION:
3422 {
3423 ret = cmd_create_session(cmd_ctx->lsm->session.name,
3424 cmd_ctx->lsm->session.path);
3425 break;
3426 }
3427 case LTTNG_DESTROY_SESSION:
3428 {
3429 ret = cmd_destroy_session(cmd_ctx->session,
3430 cmd_ctx->lsm->session.name);
3431 break;
3432 }
3433 case LTTNG_LIST_DOMAINS:
3434 {
3435 ssize_t nb_dom;
3436 struct lttng_domain *domains;
3437
3438 nb_dom = cmd_list_domains(cmd_ctx->session, &domains);
3439 if (nb_dom < 0) {
3440 ret = -nb_dom;
3441 goto error;
3442 }
3443
3444 ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain));
3445 if (ret < 0) {
3446 goto setup_error;
3447 }
3448
3449 /* Copy event list into message payload */
3450 memcpy(cmd_ctx->llm->payload, domains,
3451 nb_dom * sizeof(struct lttng_domain));
3452
3453 free(domains);
3454
3455 ret = LTTCOMM_OK;
3456 break;
3457 }
3458 case LTTNG_LIST_CHANNELS:
3459 {
3460 size_t nb_chan;
3461 struct lttng_channel *channels;
3462
3463 nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type,
3464 cmd_ctx->session, &channels);
3465 if (nb_chan < 0) {
3466 ret = -nb_chan;
3467 goto error;
3468 }
3469
3470 ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel));
3471 if (ret < 0) {
3472 goto setup_error;
3473 }
3474
3475 /* Copy event list into message payload */
3476 memcpy(cmd_ctx->llm->payload, channels,
3477 nb_chan * sizeof(struct lttng_channel));
3478
3479 free(channels);
3480
3481 ret = LTTCOMM_OK;
3482 break;
3483 }
3484 case LTTNG_LIST_EVENTS:
3485 {
3486 ssize_t nb_event;
3487 struct lttng_event *events = NULL;
3488
3489 nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session,
3490 cmd_ctx->lsm->u.list.channel_name, &events);
3491 if (nb_event < 0) {
3492 ret = -nb_event;
3493 goto error;
3494 }
3495
3496 ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event));
3497 if (ret < 0) {
3498 goto setup_error;
3499 }
3500
3501 /* Copy event list into message payload */
3502 memcpy(cmd_ctx->llm->payload, events,
3503 nb_event * sizeof(struct lttng_event));
3504
3505 free(events);
3506
3507 ret = LTTCOMM_OK;
3508 break;
3509 }
3510 case LTTNG_LIST_SESSIONS:
3511 {
3512 session_lock_list();
3513
3514 if (session_list_ptr->count == 0) {
3515 ret = LTTCOMM_NO_SESSION;
3516 session_unlock_list();
3517 goto error;
3518 }
3519
3520 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) *
3521 session_list_ptr->count);
3522 if (ret < 0) {
3523 session_unlock_list();
3524 goto setup_error;
3525 }
3526
3527 /* Filled the session array */
3528 list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload));
3529
3530 session_unlock_list();
3531
3532 ret = LTTCOMM_OK;
3533 break;
3534 }
3535 case LTTNG_CALIBRATE:
3536 {
3537 ret = cmd_calibrate(cmd_ctx->lsm->domain.type,
3538 &cmd_ctx->lsm->u.calibrate);
3539 break;
3540 }
3541 case LTTNG_REGISTER_CONSUMER:
3542 {
3543 ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3544 cmd_ctx->lsm->u.reg.path);
3545 break;
3546 }
3547 default:
3548 ret = LTTCOMM_UND;
3549 break;
3550 }
3551
3552error:
3553 if (cmd_ctx->llm == NULL) {
3554 DBG("Missing llm structure. Allocating one.");
3555 if (setup_lttng_msg(cmd_ctx, 0) < 0) {
3556 goto setup_error;
3557 }
3558 }
3559 /* Set return code */
3560 cmd_ctx->llm->ret_code = ret;
3561setup_error:
3562 if (cmd_ctx->session) {
3563 session_unlock(cmd_ctx->session);
3564 }
3565init_setup_error:
3566 return ret;
3567}
3568
3569/*
3570 * This thread manage all clients request using the unix client socket for
3571 * communication.
3572 */
3573static void *thread_manage_clients(void *data)
3574{
3575 int sock = 0, ret, i, pollfd;
3576 uint32_t revents, nb_fd;
3577 struct command_ctx *cmd_ctx = NULL;
3578 struct lttng_poll_event events;
3579
3580 DBG("[thread] Manage client started");
3581
3582 rcu_register_thread();
3583
3584 ret = lttcomm_listen_unix_sock(client_sock);
3585 if (ret < 0) {
3586 goto error;
3587 }
3588
3589 /*
3590 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3591 * more will be added to this poll set.
3592 */
3593 ret = create_thread_poll_set(&events, 2);
3594 if (ret < 0) {
3595 goto error;
3596 }
3597
3598 /* Add the application registration socket */
3599 ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI);
3600 if (ret < 0) {
3601 goto error;
3602 }
3603
3604 /*
3605 * Notify parent pid that we are ready to accept command for client side.
3606 */
3607 if (opt_sig_parent) {
3608 kill(ppid, SIGCHLD);
3609 }
3610
3611 while (1) {
3612 DBG("Accepting client command ...");
3613
3614 nb_fd = LTTNG_POLL_GETNB(&events);
3615
3616 /* Inifinite blocking call, waiting for transmission */
3617 ret = lttng_poll_wait(&events, -1);
3618 if (ret < 0) {
3619 goto error;
3620 }
3621
3622 for (i = 0; i < nb_fd; i++) {
3623 /* Fetch once the poll data */
3624 revents = LTTNG_POLL_GETEV(&events, i);
3625 pollfd = LTTNG_POLL_GETFD(&events, i);
3626
3627 /* Thread quit pipe has been closed. Killing thread. */
3628 ret = check_thread_quit_pipe(pollfd, revents);
3629 if (ret) {
3630 goto error;
3631 }
3632
3633 /* Event on the registration socket */
3634 if (pollfd == client_sock) {
3635 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3636 ERR("Client socket poll error");
3637 goto error;
3638 }
3639 }
3640 }
3641
3642 DBG("Wait for client response");
3643
3644 sock = lttcomm_accept_unix_sock(client_sock);
3645 if (sock < 0) {
3646 goto error;
3647 }
3648
3649 /* Set socket option for credentials retrieval */
3650 ret = lttcomm_setsockopt_creds_unix_sock(sock);
3651 if (ret < 0) {
3652 goto error;
3653 }
3654
3655 /* Allocate context command to process the client request */
3656 cmd_ctx = zmalloc(sizeof(struct command_ctx));
3657 if (cmd_ctx == NULL) {
3658 perror("zmalloc cmd_ctx");
3659 goto error;
3660 }
3661
3662 /* Allocate data buffer for reception */
3663 cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg));
3664 if (cmd_ctx->lsm == NULL) {
3665 perror("zmalloc cmd_ctx->lsm");
3666 goto error;
3667 }
3668
3669 cmd_ctx->llm = NULL;
3670 cmd_ctx->session = NULL;
3671
3672 /*
3673 * Data is received from the lttng client. The struct
3674 * lttcomm_session_msg (lsm) contains the command and data request of
3675 * the client.
3676 */
3677 DBG("Receiving data from client ...");
3678 ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm,
3679 sizeof(struct lttcomm_session_msg), &cmd_ctx->creds);
3680 if (ret <= 0) {
3681 DBG("Nothing recv() from client... continuing");
3682 close(sock);
3683 free(cmd_ctx);
3684 continue;
3685 }
3686
3687 // TODO: Validate cmd_ctx including sanity check for
3688 // security purpose.
3689
3690 rcu_thread_online();
3691 /*
3692 * This function dispatch the work to the kernel or userspace tracer
3693 * libs and fill the lttcomm_lttng_msg data structure of all the needed
3694 * informations for the client. The command context struct contains
3695 * everything this function may needs.
3696 */
3697 ret = process_client_msg(cmd_ctx);
3698 rcu_thread_offline();
3699 if (ret < 0) {
3700 /*
3701 * TODO: Inform client somehow of the fatal error. At
3702 * this point, ret < 0 means that a zmalloc failed
3703 * (ENOMEM). Error detected but still accept command.
3704 */
3705 clean_command_ctx(&cmd_ctx);
3706 continue;
3707 }
3708
3709 DBG("Sending response (size: %d, retcode: %s)",
3710 cmd_ctx->lttng_msg_size,
3711 lttng_strerror(-cmd_ctx->llm->ret_code));
3712 ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size);
3713 if (ret < 0) {
3714 ERR("Failed to send data back to client");
3715 }
3716
3717 /* End of transmission */
3718 close(sock);
3719
3720 clean_command_ctx(&cmd_ctx);
3721 }
3722
3723error:
3724 DBG("Client thread dying");
3725 unlink(client_unix_sock_path);
3726 close(client_sock);
3727 close(sock);
3728
3729 lttng_poll_clean(&events);
3730 clean_command_ctx(&cmd_ctx);
3731
3732 rcu_unregister_thread();
3733 return NULL;
3734}
3735
3736
3737/*
3738 * usage function on stderr
3739 */
3740static void usage(void)
3741{
3742 fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname);
3743 fprintf(stderr, " -h, --help Display this usage.\n");
3744 fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n");
3745 fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n");
3746 fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
3747 fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
3748 fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n");
3749 fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n");
3750 fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n");
3751 fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n");
3752 fprintf(stderr, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n");
3753 fprintf(stderr, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n");
3754 fprintf(stderr, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n");
3755 fprintf(stderr, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n");
3756 fprintf(stderr, " -d, --daemonize Start as a daemon.\n");
3757 fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
3758 fprintf(stderr, " -V, --version Show version number.\n");
3759 fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
3760 fprintf(stderr, " -q, --quiet No output at all.\n");
3761 fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
3762 fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n");
3763 fprintf(stderr, " --no-kernel Disable kernel tracer\n");
3764}
3765
3766/*
3767 * daemon argument parsing
3768 */
3769static int parse_args(int argc, char **argv)
3770{
3771 int c;
3772
3773 static struct option long_options[] = {
3774 { "client-sock", 1, 0, 'c' },
3775 { "apps-sock", 1, 0, 'a' },
3776 { "kconsumerd-cmd-sock", 1, 0, 'C' },
3777 { "kconsumerd-err-sock", 1, 0, 'E' },
3778 { "ustconsumerd32-cmd-sock", 1, 0, 'G' },
3779 { "ustconsumerd32-err-sock", 1, 0, 'H' },
3780 { "ustconsumerd64-cmd-sock", 1, 0, 'D' },
3781 { "ustconsumerd64-err-sock", 1, 0, 'F' },
3782 { "consumerd32-path", 1, 0, 'u' },
3783 { "consumerd32-libdir", 1, 0, 'U' },
3784 { "consumerd64-path", 1, 0, 't' },
3785 { "consumerd64-libdir", 1, 0, 'T' },
3786 { "daemonize", 0, 0, 'd' },
3787 { "sig-parent", 0, 0, 'S' },
3788 { "help", 0, 0, 'h' },
3789 { "group", 1, 0, 'g' },
3790 { "version", 0, 0, 'V' },
3791 { "quiet", 0, 0, 'q' },
3792 { "verbose", 0, 0, 'v' },
3793 { "verbose-consumer", 0, 0, 'Z' },
3794 { "no-kernel", 0, 0, 'N' },
3795 { NULL, 0, 0, 0 }
3796 };
3797
3798 while (1) {
3799 int option_index = 0;
3800 c = getopt_long(argc, argv, "dhqvVSN" "a:c:g:s:C:E:D:F:Z:u:t",
3801 long_options, &option_index);
3802 if (c == -1) {
3803 break;
3804 }
3805
3806 switch (c) {
3807 case 0:
3808 fprintf(stderr, "option %s", long_options[option_index].name);
3809 if (optarg) {
3810 fprintf(stderr, " with arg %s\n", optarg);
3811 }
3812 break;
3813 case 'c':
3814 snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg);
3815 break;
3816 case 'a':
3817 snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg);
3818 break;
3819 case 'd':
3820 opt_daemon = 1;
3821 break;
3822 case 'g':
3823 opt_tracing_group = optarg;
3824 break;
3825 case 'h':
3826 usage();
3827 exit(EXIT_FAILURE);
3828 case 'V':
3829 fprintf(stdout, "%s\n", VERSION);
3830 exit(EXIT_SUCCESS);
3831 case 'S':
3832 opt_sig_parent = 1;
3833 break;
3834 case 'E':
3835 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3836 break;
3837 case 'C':
3838 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3839 break;
3840 case 'F':
3841 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3842 break;
3843 case 'D':
3844 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3845 break;
3846 case 'H':
3847 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3848 break;
3849 case 'G':
3850 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3851 break;
3852 case 'N':
3853 opt_no_kernel = 1;
3854 break;
3855 case 'q':
3856 opt_quiet = 1;
3857 break;
3858 case 'v':
3859 /* Verbose level can increase using multiple -v */
3860 opt_verbose += 1;
3861 break;
3862 case 'Z':
3863 opt_verbose_consumer += 1;
3864 break;
3865 case 'u':
3866 consumerd32_bin= optarg;
3867 break;
3868 case 'U':
3869 consumerd32_libdir = optarg;
3870 break;
3871 case 't':
3872 consumerd64_bin = optarg;
3873 break;
3874 case 'T':
3875 consumerd64_libdir = optarg;
3876 break;
3877 default:
3878 /* Unknown option or other error.
3879 * Error is printed by getopt, just return */
3880 return -1;
3881 }
3882 }
3883
3884 return 0;
3885}
3886
3887/*
3888 * Creates the two needed socket by the daemon.
3889 * apps_sock - The communication socket for all UST apps.
3890 * client_sock - The communication of the cli tool (lttng).
3891 */
3892static int init_daemon_socket(void)
3893{
3894 int ret = 0;
3895 mode_t old_umask;
3896
3897 old_umask = umask(0);
3898
3899 /* Create client tool unix socket */
3900 client_sock = lttcomm_create_unix_sock(client_unix_sock_path);
3901 if (client_sock < 0) {
3902 ERR("Create unix sock failed: %s", client_unix_sock_path);
3903 ret = -1;
3904 goto end;
3905 }
3906
3907 /* File permission MUST be 660 */
3908 ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
3909 if (ret < 0) {
3910 ERR("Set file permissions failed: %s", client_unix_sock_path);
3911 perror("chmod");
3912 goto end;
3913 }
3914
3915 /* Create the application unix socket */
3916 apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path);
3917 if (apps_sock < 0) {
3918 ERR("Create unix sock failed: %s", apps_unix_sock_path);
3919 ret = -1;
3920 goto end;
3921 }
3922
3923 /* File permission MUST be 666 */
3924 ret = chmod(apps_unix_sock_path,
3925 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
3926 if (ret < 0) {
3927 ERR("Set file permissions failed: %s", apps_unix_sock_path);
3928 perror("chmod");
3929 goto end;
3930 }
3931
3932end:
3933 umask(old_umask);
3934 return ret;
3935}
3936
3937/*
3938 * Check if the global socket is available, and if a daemon is answering at the
3939 * other side. If yes, error is returned.
3940 */
3941static int check_existing_daemon(void)
3942{
3943 if (access(client_unix_sock_path, F_OK) < 0 &&
3944 access(apps_unix_sock_path, F_OK) < 0) {
3945 return 0;
3946 }
3947
3948 /* Is there anybody out there ? */
3949 if (lttng_session_daemon_alive()) {
3950 return -EEXIST;
3951 } else {
3952 return 0;
3953 }
3954}
3955
3956/*
3957 * Set the tracing group gid onto the client socket.
3958 *
3959 * Race window between mkdir and chown is OK because we are going from more
3960 * permissive (root.root) to les permissive (root.tracing).
3961 */
3962static int set_permissions(char *rundir)
3963{
3964 int ret;
3965 gid_t gid;
3966
3967 gid = allowed_group();
3968 if (gid < 0) {
3969 WARN("No tracing group detected");
3970 ret = 0;
3971 goto end;
3972 }
3973
3974 /* Set lttng run dir */
3975 ret = chown(rundir, 0, gid);
3976 if (ret < 0) {
3977 ERR("Unable to set group on %s", rundir);
3978 perror("chown");
3979 }
3980
3981 /* lttng client socket path */
3982 ret = chown(client_unix_sock_path, 0, gid);
3983 if (ret < 0) {
3984 ERR("Unable to set group on %s", client_unix_sock_path);
3985 perror("chown");
3986 }
3987
3988 /* kconsumer error socket path */
3989 ret = chown(kconsumer_data.err_unix_sock_path, 0, gid);
3990 if (ret < 0) {
3991 ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path);
3992 perror("chown");
3993 }
3994
3995 /* 64-bit ustconsumer error socket path */
3996 ret = chown(ustconsumer64_data.err_unix_sock_path, 0, gid);
3997 if (ret < 0) {
3998 ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path);
3999 perror("chown");
4000 }
4001
4002 /* 32-bit ustconsumer compat32 error socket path */
4003 ret = chown(ustconsumer32_data.err_unix_sock_path, 0, gid);
4004 if (ret < 0) {
4005 ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path);
4006 perror("chown");
4007 }
4008
4009 DBG("All permissions are set");
4010
4011end:
4012 return ret;
4013}
4014
4015/*
4016 * Create the pipe used to wake up the kernel thread.
4017 */
4018static int create_kernel_poll_pipe(void)
4019{
4020 return pipe2(kernel_poll_pipe, O_CLOEXEC);
4021}
4022
4023/*
4024 * Create the application command pipe to wake thread_manage_apps.
4025 */
4026static int create_apps_cmd_pipe(void)
4027{
4028 return pipe2(apps_cmd_pipe, O_CLOEXEC);
4029}
4030
4031/*
4032 * Create the lttng run directory needed for all global sockets and pipe.
4033 */
4034static int create_lttng_rundir(const char *rundir)
4035{
4036 int ret;
4037
4038 DBG3("Creating LTTng run directory: %s", rundir);
4039
4040 ret = mkdir(rundir, S_IRWXU | S_IRWXG );
4041 if (ret < 0) {
4042 if (errno != EEXIST) {
4043 ERR("Unable to create %s", rundir);
4044 goto error;
4045 } else {
4046 ret = 0;
4047 }
4048 }
4049
4050error:
4051 return ret;
4052}
4053
4054/*
4055 * Setup sockets and directory needed by the kconsumerd communication with the
4056 * session daemon.
4057 */
4058static int set_consumer_sockets(struct consumer_data *consumer_data,
4059 const char *rundir)
4060{
4061 int ret;
4062 char path[PATH_MAX];
4063
4064 switch (consumer_data->type) {
4065 case LTTNG_CONSUMER_KERNEL:
4066 snprintf(path, PATH_MAX, KCONSUMERD_PATH, rundir);
4067 break;
4068 case LTTNG_CONSUMER64_UST:
4069 snprintf(path, PATH_MAX, USTCONSUMERD64_PATH, rundir);
4070 break;
4071 case LTTNG_CONSUMER32_UST:
4072 snprintf(path, PATH_MAX, USTCONSUMERD32_PATH, rundir);
4073 break;
4074 default:
4075 ERR("Consumer type unknown");
4076 ret = -EINVAL;
4077 goto error;
4078 }
4079
4080 DBG2("Creating consumer directory: %s", path);
4081
4082 ret = mkdir(path, S_IRWXU | S_IRWXG);
4083 if (ret < 0) {
4084 if (errno != EEXIST) {
4085 ERR("Failed to create %s", path);
4086 goto error;
4087 }
4088 ret = 0;
4089 }
4090
4091 /* Create the kconsumerd error unix socket */
4092 consumer_data->err_sock =
4093 lttcomm_create_unix_sock(consumer_data->err_unix_sock_path);
4094 if (consumer_data->err_sock < 0) {
4095 ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path);
4096 ret = -1;
4097 goto error;
4098 }
4099
4100 /* File permission MUST be 660 */
4101 ret = chmod(consumer_data->err_unix_sock_path,
4102 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
4103 if (ret < 0) {
4104 ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path);
4105 PERROR("chmod");
4106 goto error;
4107 }
4108
4109error:
4110 return ret;
4111}
4112
4113/*
4114 * Signal handler for the daemon
4115 *
4116 * Simply stop all worker threads, leaving main() return gracefully after
4117 * joining all threads and calling cleanup().
4118 */
4119static void sighandler(int sig)
4120{
4121 switch (sig) {
4122 case SIGPIPE:
4123 DBG("SIGPIPE catched");
4124 return;
4125 case SIGINT:
4126 DBG("SIGINT catched");
4127 stop_threads();
4128 break;
4129 case SIGTERM:
4130 DBG("SIGTERM catched");
4131 stop_threads();
4132 break;
4133 default:
4134 break;
4135 }
4136}
4137
4138/*
4139 * Setup signal handler for :
4140 * SIGINT, SIGTERM, SIGPIPE
4141 */
4142static int set_signal_handler(void)
4143{
4144 int ret = 0;
4145 struct sigaction sa;
4146 sigset_t sigset;
4147
4148 if ((ret = sigemptyset(&sigset)) < 0) {
4149 perror("sigemptyset");
4150 return ret;
4151 }
4152
4153 sa.sa_handler = sighandler;
4154 sa.sa_mask = sigset;
4155 sa.sa_flags = 0;
4156 if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
4157 perror("sigaction");
4158 return ret;
4159 }
4160
4161 if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
4162 perror("sigaction");
4163 return ret;
4164 }
4165
4166 if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
4167 perror("sigaction");
4168 return ret;
4169 }
4170
4171 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
4172
4173 return ret;
4174}
4175
4176/*
4177 * Set open files limit to unlimited. This daemon can open a large number of
4178 * file descriptors in order to consumer multiple kernel traces.
4179 */
4180static void set_ulimit(void)
4181{
4182 int ret;
4183 struct rlimit lim;
4184
4185 /* The kernel does not allowed an infinite limit for open files */
4186 lim.rlim_cur = 65535;
4187 lim.rlim_max = 65535;
4188
4189 ret = setrlimit(RLIMIT_NOFILE, &lim);
4190 if (ret < 0) {
4191 perror("failed to set open files limit");
4192 }
4193}
4194
4195/*
4196 * main
4197 */
4198int main(int argc, char **argv)
4199{
4200 int ret = 0;
4201 void *status;
4202 const char *home_path;
4203
4204 rcu_register_thread();
4205
4206 /* Create thread quit pipe */
4207 if ((ret = init_thread_quit_pipe()) < 0) {
4208 goto error;
4209 }
4210
4211 setup_consumerd_path();
4212
4213 /* Parse arguments */
4214 progname = argv[0];
4215 if ((ret = parse_args(argc, argv) < 0)) {
4216 goto error;
4217 }
4218
4219 /* Daemonize */
4220 if (opt_daemon) {
4221 ret = daemon(0, 0);
4222 if (ret < 0) {
4223 perror("daemon");
4224 goto error;
4225 }
4226 }
4227
4228 /* Check if daemon is UID = 0 */
4229 is_root = !getuid();
4230
4231 if (is_root) {
4232 rundir = strdup(LTTNG_RUNDIR);
4233
4234 /* Create global run dir with root access */
4235 ret = create_lttng_rundir(rundir);
4236 if (ret < 0) {
4237 goto error;
4238 }
4239
4240 if (strlen(apps_unix_sock_path) == 0) {
4241 snprintf(apps_unix_sock_path, PATH_MAX,
4242 DEFAULT_GLOBAL_APPS_UNIX_SOCK);
4243 }
4244
4245 if (strlen(client_unix_sock_path) == 0) {
4246 snprintf(client_unix_sock_path, PATH_MAX,
4247 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK);
4248 }
4249
4250 /* Set global SHM for ust */
4251 if (strlen(wait_shm_path) == 0) {
4252 snprintf(wait_shm_path, PATH_MAX,
4253 DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH);
4254 }
4255
4256 /* Setup kernel consumerd path */
4257 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX,
4258 KCONSUMERD_ERR_SOCK_PATH, rundir);
4259 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX,
4260 KCONSUMERD_CMD_SOCK_PATH, rundir);
4261
4262 DBG2("Kernel consumer err path: %s",
4263 kconsumer_data.err_unix_sock_path);
4264 DBG2("Kernel consumer cmd path: %s",
4265 kconsumer_data.cmd_unix_sock_path);
4266 } else {
4267 home_path = get_home_dir();
4268 if (home_path == NULL) {
4269 /* TODO: Add --socket PATH option */
4270 ERR("Can't get HOME directory for sockets creation.");
4271 ret = -EPERM;
4272 goto error;
4273 }
4274
4275 /*
4276 * Create rundir from home path. This will create something like
4277 * $HOME/.lttng
4278 */
4279 ret = asprintf(&rundir, LTTNG_HOME_RUNDIR, home_path);
4280 if (ret < 0) {
4281 ret = -ENOMEM;
4282 goto error;
4283 }
4284
4285 ret = create_lttng_rundir(rundir);
4286 if (ret < 0) {
4287 goto error;
4288 }
4289
4290 if (strlen(apps_unix_sock_path) == 0) {
4291 snprintf(apps_unix_sock_path, PATH_MAX,
4292 DEFAULT_HOME_APPS_UNIX_SOCK, home_path);
4293 }
4294
4295 /* Set the cli tool unix socket path */
4296 if (strlen(client_unix_sock_path) == 0) {
4297 snprintf(client_unix_sock_path, PATH_MAX,
4298 DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path);
4299 }
4300
4301 /* Set global SHM for ust */
4302 if (strlen(wait_shm_path) == 0) {
4303 snprintf(wait_shm_path, PATH_MAX,
4304 DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid());
4305 }
4306 }
4307
4308 DBG("Client socket path %s", client_unix_sock_path);
4309 DBG("Application socket path %s", apps_unix_sock_path);
4310 DBG("LTTng run directory path: %s", rundir);
4311
4312 /* 32 bits consumerd path setup */
4313 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX,
4314 USTCONSUMERD32_ERR_SOCK_PATH, rundir);
4315 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX,
4316 USTCONSUMERD32_CMD_SOCK_PATH, rundir);
4317
4318 DBG2("UST consumer 32 bits err path: %s",
4319 ustconsumer32_data.err_unix_sock_path);
4320 DBG2("UST consumer 32 bits cmd path: %s",
4321 ustconsumer32_data.cmd_unix_sock_path);
4322
4323 /* 64 bits consumerd path setup */
4324 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX,
4325 USTCONSUMERD64_ERR_SOCK_PATH, rundir);
4326 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX,
4327 USTCONSUMERD64_CMD_SOCK_PATH, rundir);
4328
4329 DBG2("UST consumer 64 bits err path: %s",
4330 ustconsumer64_data.err_unix_sock_path);
4331 DBG2("UST consumer 64 bits cmd path: %s",
4332 ustconsumer64_data.cmd_unix_sock_path);
4333
4334 /*
4335 * See if daemon already exist.
4336 */
4337 if ((ret = check_existing_daemon()) < 0) {
4338 ERR("Already running daemon.\n");
4339 /*
4340 * We do not goto exit because we must not cleanup()
4341 * because a daemon is already running.
4342 */
4343 goto error;
4344 }
4345
4346 /* After this point, we can safely call cleanup() with "goto exit" */
4347
4348 /*
4349 * These actions must be executed as root. We do that *after* setting up
4350 * the sockets path because we MUST make the check for another daemon using
4351 * those paths *before* trying to set the kernel consumer sockets and init
4352 * kernel tracer.
4353 */
4354 if (is_root) {
4355 ret = set_consumer_sockets(&kconsumer_data, rundir);
4356 if (ret < 0) {
4357 goto exit;
4358 }
4359
4360 /* Setup kernel tracer */
4361 if (!opt_no_kernel) {
4362 init_kernel_tracer();
4363 }
4364
4365 /* Set ulimit for open files */
4366 set_ulimit();
4367 }
4368
4369 ret = set_consumer_sockets(&ustconsumer64_data, rundir);
4370 if (ret < 0) {
4371 goto exit;
4372 }
4373
4374 ret = set_consumer_sockets(&ustconsumer32_data, rundir);
4375 if (ret < 0) {
4376 goto exit;
4377 }
4378
4379 if ((ret = set_signal_handler()) < 0) {
4380 goto exit;
4381 }
4382
4383 /* Setup the needed unix socket */
4384 if ((ret = init_daemon_socket()) < 0) {
4385 goto exit;
4386 }
4387
4388 /* Set credentials to socket */
4389 if (is_root && ((ret = set_permissions(rundir)) < 0)) {
4390 goto exit;
4391 }
4392
4393 /* Get parent pid if -S, --sig-parent is specified. */
4394 if (opt_sig_parent) {
4395 ppid = getppid();
4396 }
4397
4398 /* Setup the kernel pipe for waking up the kernel thread */
4399 if ((ret = create_kernel_poll_pipe()) < 0) {
4400 goto exit;
4401 }
4402
4403 /* Setup the thread apps communication pipe. */
4404 if ((ret = create_apps_cmd_pipe()) < 0) {
4405 goto exit;
4406 }
4407
4408 /* Init UST command queue. */
4409 cds_wfq_init(&ust_cmd_queue.queue);
4410
4411 /* Init UST app hash table */
4412 ust_app_ht_alloc();
4413
4414 /*
4415 * Get session list pointer. This pointer MUST NOT be free(). This list is
4416 * statically declared in session.c
4417 */
4418 session_list_ptr = session_get_list();
4419
4420 /* Set up max poll set size */
4421 lttng_poll_set_max_size();
4422
4423 /* Create thread to manage the client socket */
4424 ret = pthread_create(&client_thread, NULL,
4425 thread_manage_clients, (void *) NULL);
4426 if (ret != 0) {
4427 perror("pthread_create clients");
4428 goto exit_client;
4429 }
4430
4431 /* Create thread to dispatch registration */
4432 ret = pthread_create(&dispatch_thread, NULL,
4433 thread_dispatch_ust_registration, (void *) NULL);
4434 if (ret != 0) {
4435 perror("pthread_create dispatch");
4436 goto exit_dispatch;
4437 }
4438
4439 /* Create thread to manage application registration. */
4440 ret = pthread_create(&reg_apps_thread, NULL,
4441 thread_registration_apps, (void *) NULL);
4442 if (ret != 0) {
4443 perror("pthread_create registration");
4444 goto exit_reg_apps;
4445 }
4446
4447 /* Create thread to manage application socket */
4448 ret = pthread_create(&apps_thread, NULL,
4449 thread_manage_apps, (void *) NULL);
4450 if (ret != 0) {
4451 perror("pthread_create apps");
4452 goto exit_apps;
4453 }
4454
4455 /* Create kernel thread to manage kernel event */
4456 ret = pthread_create(&kernel_thread, NULL,
4457 thread_manage_kernel, (void *) NULL);
4458 if (ret != 0) {
4459 perror("pthread_create kernel");
4460 goto exit_kernel;
4461 }
4462
4463 ret = pthread_join(kernel_thread, &status);
4464 if (ret != 0) {
4465 perror("pthread_join");
4466 goto error; /* join error, exit without cleanup */
4467 }
4468
4469exit_kernel:
4470 ret = pthread_join(apps_thread, &status);
4471 if (ret != 0) {
4472 perror("pthread_join");
4473 goto error; /* join error, exit without cleanup */
4474 }
4475
4476exit_apps:
4477 ret = pthread_join(reg_apps_thread, &status);
4478 if (ret != 0) {
4479 perror("pthread_join");
4480 goto error; /* join error, exit without cleanup */
4481 }
4482
4483exit_reg_apps:
4484 ret = pthread_join(dispatch_thread, &status);
4485 if (ret != 0) {
4486 perror("pthread_join");
4487 goto error; /* join error, exit without cleanup */
4488 }
4489
4490exit_dispatch:
4491 ret = pthread_join(client_thread, &status);
4492 if (ret != 0) {
4493 perror("pthread_join");
4494 goto error; /* join error, exit without cleanup */
4495 }
4496
4497 ret = join_consumer_thread(&kconsumer_data);
4498 if (ret != 0) {
4499 perror("join_consumer");
4500 goto error; /* join error, exit without cleanup */
4501 }
4502
4503exit_client:
4504exit:
4505 /*
4506 * cleanup() is called when no other thread is running.
4507 */
4508 rcu_thread_online();
4509 cleanup();
4510 rcu_thread_offline();
4511 rcu_unregister_thread();
4512 if (!ret) {
4513 exit(EXIT_SUCCESS);
4514 }
4515error:
4516 exit(EXIT_FAILURE);
4517}
LTTng 2.0 tools and control repository
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