Handle splice errors
[lttng-tools.git] / kconsumerd / kconsumerd.c
CommitLineData
d4a1283e
JD
1/*
2 * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca>
3 * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License
7 * as published by the Free Software Foundation; either version 2
8 * of the License, or (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
18 */
19
20#define _GNU_SOURCE
21#include <fcntl.h>
22#include <getopt.h>
23#include <grp.h>
24#include <limits.h>
25#include <pthread.h>
26#include <signal.h>
27#include <stdio.h>
28#include <stdlib.h>
29#include <string.h>
30#include <sys/ipc.h>
31#include <sys/shm.h>
32#include <sys/socket.h>
33#include <sys/stat.h>
34#include <sys/types.h>
35#include <urcu/list.h>
36#include <poll.h>
37#include <unistd.h>
38
39#include "lttngerr.h"
40#include "libkernelctl.h"
41#include "liblttsessiondcomm.h"
42#include "kconsumerd.h"
43
44/* Init the list of FDs */
45static struct ltt_kconsumerd_fd_list kconsumerd_fd_list = {
46 .head = CDS_LIST_HEAD_INIT(kconsumerd_fd_list.head),
47};
48
49/* Number of element for the list below. */
50static unsigned int fds_count;
51
52/* If the local array of FDs needs update in the poll function */
53static unsigned int update_fd_array = 1;
54
55/* lock the fd array and structures */
56static pthread_mutex_t kconsumerd_lock_fds;
57
58/* the two threads (receive fd and poll) */
59static pthread_t threads[2];
60
61/* communication with splice */
62static int thread_pipe[2];
63
64/* socket to communicate errors with sessiond */
65static int error_socket = -1;
66
67/* Argument variables */
68int opt_quiet;
69int opt_verbose;
70static int opt_daemon;
71static const char *progname;
72static char command_sock_path[PATH_MAX]; /* Global command socket path */
73static char error_sock_path[PATH_MAX]; /* Global error path */
74
75/*
76 * cleanup
77 *
78 * Cleanup the daemon's socket on exit
79 */
80static void cleanup()
81{
82 unlink(command_sock_path);
83}
84
85/* send_error
86 *
87 * send return code to ltt-sessiond
88 */
89static int send_error(enum lttcomm_return_code cmd)
90{
91 if (error_socket > 0) {
92 return lttcomm_send_unix_sock(error_socket, &cmd,
93 sizeof(enum lttcomm_sessiond_command));
94 } else {
95 return 0;
96 }
97}
98
99/*
100 * cleanup_kconsumerd_fd
101 *
102 * Close the FDs and frees a ltt_kconsumerd_fd struct
103 */
104static void cleanup_kconsumerd_fd(struct ltt_kconsumerd_fd *lcf)
105{
106 if (lcf != NULL) {
107 close(lcf->out_fd);
108 close(lcf->consumerd_fd);
109 free(lcf);
110 lcf = NULL;
111 }
112}
113
114/*
115 * add_fd
116 *
117 * Add a fd to the global list protected by a mutex
118 */
119static int add_fd(struct lttcomm_kconsumerd_msg *buf, int consumerd_fd)
120{
121 struct ltt_kconsumerd_fd *tmp_fd;
122 int ret;
123
124 tmp_fd = malloc(sizeof(struct ltt_kconsumerd_fd));
125 tmp_fd->sessiond_fd = buf->fd;
126 tmp_fd->consumerd_fd = consumerd_fd;
127 tmp_fd->state = buf->state;
128 tmp_fd->max_sb_size = buf->max_sb_size;
129 strncpy(tmp_fd->path_name, buf->path_name, PATH_MAX);
130
131 /* Opening the tracefile in write mode */
132 DBG("Opening %s for writing", tmp_fd->path_name);
133 ret = open(tmp_fd->path_name,
134 O_WRONLY|O_CREAT, S_IRWXU|S_IRWXG|S_IRWXO);
135 if (ret < 0) {
136 ERR("Opening %s", tmp_fd->path_name);
137 perror("open");
138 goto end;
139 }
140 tmp_fd->out_fd = ret;
141 tmp_fd->out_fd_offset = 0;
142
143 DBG("Adding %s (%d, %d, %d)", tmp_fd->path_name,
144 tmp_fd->sessiond_fd, tmp_fd->consumerd_fd, tmp_fd->out_fd);
145
146 pthread_mutex_lock(&kconsumerd_lock_fds);
147 cds_list_add(&tmp_fd->list, &kconsumerd_fd_list.head);
148 fds_count++;
149 pthread_mutex_unlock(&kconsumerd_lock_fds);
150
151end:
152 return ret;
153}
154
155/*
156 * del_fd
157 *
158 * Remove a fd from the global list protected by a mutex
159 */
160static void del_fd(struct ltt_kconsumerd_fd *lcf)
161{
162 pthread_mutex_lock(&kconsumerd_lock_fds);
163 cds_list_del(&lcf->list);
164 if (fds_count > 0) {
165 fds_count--;
166 DBG("Removed ltt_kconsumerd_fd");
167 cleanup_kconsumerd_fd(lcf);
168 }
169 pthread_mutex_unlock(&kconsumerd_lock_fds);
170}
171
172/*
173 * close_outfds
174 *
175 * Close all fds in the previous fd_list
176 * Must be used with kconsumerd_lock_fds lock held
177 */
178static void close_outfds()
179{
180 struct ltt_kconsumerd_fd *iter;
181 cds_list_for_each_entry(iter, &kconsumerd_fd_list.head, list) {
182 del_fd(iter);
183 }
184}
185
186/*
187 * sighandler
188 *
189 * Signal handler for the daemon
190 */
191static void sighandler(int sig)
192{
193 /* unblock the threads */
194 pthread_cancel(threads[0]);
195 pthread_cancel(threads[1]);
196
197 close_outfds();
198 cleanup();
199
200 return;
201}
202
203/*
204 * set_signal_handler
205 *
206 * Setup signal handler for :
207 * SIGINT, SIGTERM, SIGPIPE
208 */
209static int set_signal_handler(void)
210{
211 int ret = 0;
212 struct sigaction sa;
213 sigset_t sigset;
214
215 if ((ret = sigemptyset(&sigset)) < 0) {
216 perror("sigemptyset");
217 return ret;
218 }
219
220 sa.sa_handler = sighandler;
221 sa.sa_mask = sigset;
222 sa.sa_flags = 0;
223 if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
224 perror("sigaction");
225 return ret;
226 }
227
228 if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
229 perror("sigaction");
230 return ret;
231 }
232
233 if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
234 perror("sigaction");
235 return ret;
236 }
237
238 return ret;
239}
240
241/*
242 * on_read_subbuffer
243 *
244 * Splice the data from the ring buffer to the tracefile.
245 * Returns the number of bytes spliced
246 */
247static int on_read_subbuffer(struct ltt_kconsumerd_fd *kconsumerd_fd,
248 unsigned long len)
249{
250 long ret = 0;
251 loff_t offset = 0;
252 off_t orig_offset = kconsumerd_fd->out_fd_offset;
253 int fd = kconsumerd_fd->consumerd_fd;
254 int outfd = kconsumerd_fd->out_fd;
255
256 while (len > 0) {
257 DBG("splice chan to pipe offset %lu (fd : %d)",
258 (unsigned long)offset, fd);
259 ret = splice(fd, &offset, thread_pipe[1], NULL, len,
260 SPLICE_F_MOVE | SPLICE_F_MORE);
261 DBG("splice chan to pipe ret %ld", ret);
262 if (ret < 0) {
0632499a 263 ret = errno;
d4a1283e 264 perror("Error in relay splice");
0632499a 265 goto splice_error;
d4a1283e
JD
266 }
267
268 ret = splice(thread_pipe[0], NULL, outfd, NULL, ret,
269 SPLICE_F_MOVE | SPLICE_F_MORE);
270 DBG("splice pipe to file %ld", ret);
271 if (ret < 0) {
0632499a 272 ret = errno;
d4a1283e 273 perror("Error in file splice");
0632499a 274 goto splice_error;
d4a1283e
JD
275 }
276 if (ret >= len) {
277 len = 0;
278 }
279 /* This won't block, but will start writeout asynchronously */
280 sync_file_range(outfd, kconsumerd_fd->out_fd_offset, ret,
281 SYNC_FILE_RANGE_WRITE);
282 kconsumerd_fd->out_fd_offset += ret;
283 }
0632499a 284
d4a1283e
JD
285 /*
286 * This does a blocking write-and-wait on any page that belongs to the
287 * subbuffer prior to the one we just wrote.
288 * Don't care about error values, as these are just hints and ways to
289 * limit the amount of page cache used.
290 */
291 if (orig_offset >= kconsumerd_fd->max_sb_size) {
292 sync_file_range(outfd, orig_offset - kconsumerd_fd->max_sb_size,
293 kconsumerd_fd->max_sb_size,
294 SYNC_FILE_RANGE_WAIT_BEFORE
295 | SYNC_FILE_RANGE_WRITE
296 | SYNC_FILE_RANGE_WAIT_AFTER);
297 /*
298 * Give hints to the kernel about how we access the file:
299 * POSIX_FADV_DONTNEED : we won't re-access data in a near
300 * future after we write it.
301 * We need to call fadvise again after the file grows because
302 * the kernel does not seem to apply fadvise to non-existing
303 * parts of the file.
304 * Call fadvise _after_ having waited for the page writeback to
305 * complete because the dirty page writeback semantic is not
306 * well defined. So it can be expected to lead to lower
307 * throughput in streaming.
308 */
309 posix_fadvise(outfd, orig_offset - kconsumerd_fd->max_sb_size,
310 kconsumerd_fd->max_sb_size, POSIX_FADV_DONTNEED);
311 }
0632499a
JD
312 goto end;
313
314splice_error:
315 /* send the appropriate error description to sessiond */
316 switch(ret) {
317 case EBADF:
318 send_error(KCONSUMERD_SPLICE_EBADF);
319 break;
320 case EINVAL:
321 send_error(KCONSUMERD_SPLICE_EINVAL);
322 break;
323 case ENOMEM:
324 send_error(KCONSUMERD_SPLICE_ENOMEM);
325 break;
326 case ESPIPE:
327 send_error(KCONSUMERD_SPLICE_ESPIPE);
328 break;
329 }
330
331end:
d4a1283e
JD
332 return ret;
333}
334
335/*
336 * read_subbuffer
337 *
338 * Consume data on a file descriptor and write it on a trace file
339 */
340static int read_subbuffer(struct ltt_kconsumerd_fd *kconsumerd_fd)
341{
342 unsigned long len;
343 int err;
344 long ret = 0;
345 int infd = kconsumerd_fd->consumerd_fd;
346
347 DBG("In read_subbuffer");
348 /* Get the next subbuffer */
349 err = kernctl_get_next_subbuf(infd);
350 if (err != 0) {
351 ret = errno;
352 perror("Reserving sub buffer failed (everything is normal, "
353 "it is due to concurrency)");
354 goto end;
355 }
356
357 /* read the whole subbuffer */
358 err = kernctl_get_padded_subbuf_size(infd, &len);
359 if (err != 0) {
360 ret = errno;
361 perror("Getting sub-buffer len failed.");
362 goto end;
363 }
364
365 /* splice the subbuffer to the tracefile */
366 ret = on_read_subbuffer(kconsumerd_fd, len);
367 if (ret < 0) {
368 /*
369 * display the error but continue processing to try
370 * to release the subbuffer
371 */
372 ERR("Error splicing to tracefile");
373 }
374
375 err = kernctl_put_next_subbuf(infd);
376 if (err != 0) {
377 ret = errno;
378 if (errno == EFAULT) {
379 perror("Error in unreserving sub buffer\n");
380 } else if (errno == EIO) {
381 /* Should never happen with newer LTTng versions */
382 perror("Reader has been pushed by the writer, last sub-buffer corrupted.");
383 }
384 goto end;
385 }
386
387end:
388 return ret;
389}
390
391/*
392 * change_fd_state
393 *
394 * Update a fd according to what we just received
395 */
396static void change_fd_state(int sessiond_fd,
397 enum lttcomm_kconsumerd_fd_state state)
398{
399 struct ltt_kconsumerd_fd *iter;
400 cds_list_for_each_entry(iter, &kconsumerd_fd_list.head, list) {
401 if (iter->sessiond_fd == sessiond_fd) {
402 iter->state = state;
403 break;
404 }
405 }
406}
407
408/*
409 * consumerd_recv_fd
410 *
411 * Receives an array of file descriptors and the associated
412 * structures describing each fd (path name).
413 * Returns the size of received data
414 */
415static int consumerd_recv_fd(int sfd, int size,
416 enum lttcomm_consumerd_command cmd_type)
417{
418 struct msghdr msg;
419 struct iovec iov[1];
420 int ret, i;
421 struct cmsghdr *cmsg;
422 int nb_fd;
423 char tmp[CMSG_SPACE(size)];
424 struct lttcomm_kconsumerd_msg *buf;
425 /* the number of fds we are about to receive */
426 nb_fd = size/sizeof(struct lttcomm_kconsumerd_msg);
427
428 buf = malloc(size);
429
430 memset(&msg, 0, sizeof(msg));
431
432 /* Prepare to receive the structures */
433 iov[0].iov_base = buf;
434 iov[0].iov_len = size;
435 msg.msg_iov = iov;
436 msg.msg_iovlen = 1;
437
438 msg.msg_control = tmp;
439 msg.msg_controllen = sizeof(tmp);
440
441 DBG("Waiting to receive fds");
442 if ((ret = recvmsg(sfd, &msg, 0)) < 0) {
443 perror("recvmsg");
444 }
445 if (ret != size) {
446 ERR("Received only %d, expected %d", ret, size);
447 send_error(KCONSUMERD_ERROR_RECV_FD);
448 goto end;
449 }
450
451 cmsg = CMSG_FIRSTHDR(&msg);
452 if (!cmsg) {
453 ERR("Invalid control message header");
454 ret = -1;
455 send_error(KCONSUMERD_ERROR_RECV_FD);
456 goto end;
457 }
458
459 /* if we received fds */
460 if (cmsg->cmsg_level == SOL_SOCKET && cmsg->cmsg_type == SCM_RIGHTS) {
461 DBG("Receive : expecting %d fds", nb_fd);
462 for (i = 0; i < nb_fd; i++) {
463 switch (cmd_type) {
464 case LTTCOMM_ADD_STREAM:
465 DBG("add_fd %s (%d)", buf[i].path_name, ((int *)CMSG_DATA(cmsg))[i]);
466 ret = add_fd(&buf[i], ((int *)CMSG_DATA(cmsg))[i]);
467 if (ret < 0) {
468 send_error(KCONSUMERD_OUTFD_ERROR);
469 goto end;
470 }
471 break;
472 case LTTCOMM_UPDATE_STREAM:
473 change_fd_state(buf[i].fd, buf[i].state);
474 break;
475 default:
476 break;
477 }
478 }
479 /* flag to tell the polling thread to update its fd array */
480 update_fd_array = 1;
481 send_error(KCONSUMERD_SUCCESS_RECV_FD);
482 } else {
483 ERR("Didn't received any fd");
484 send_error(KCONSUMERD_ERROR_RECV_FD);
485 ret = -1;
486 goto end;
487 }
488
489end:
490 if (buf != NULL) {
491 free(buf);
492 buf = NULL;
493 }
494 return ret;
495}
496
497/*
498 * thread_receive_fds
499 *
500 * This thread listens on the consumerd socket and
501 * receives the file descriptors from ltt-sessiond
502 */
503static void *thread_receive_fds(void *data)
504{
505 int sock, client_socket, ret;
506 struct lttcomm_kconsumerd_header tmp;
507
508 DBG("Creating command socket %s", command_sock_path);
509 unlink(command_sock_path);
510 client_socket = lttcomm_create_unix_sock(command_sock_path);
511 if (client_socket < 0) {
512 ERR("Cannot create command socket");
513 goto error;
514 }
515
516 ret = lttcomm_listen_unix_sock(client_socket);
517 if (ret < 0) {
518 goto error;
519 }
520
521 DBG("Sending ready command to ltt-sessiond");
522 ret = send_error(KCONSUMERD_COMMAND_SOCK_READY);
523 if (ret < 0) {
524 ERR("Error sending ready command to ltt-sessiond");
525 goto error;
526 }
527
528 while (1) {
529 /* Blocking call, waiting for transmission */
530 sock = lttcomm_accept_unix_sock(client_socket);
531 if (sock <= 0) {
532 continue;
533 }
534
535 /* We first get the number of fd we are about to receive */
536 ret = lttcomm_recv_unix_sock(sock, &tmp,
537 sizeof(struct lttcomm_kconsumerd_header));
538 if (ret < 0) {
539 ERR("Receiving the lttcomm_kconsumerd_header");
540 continue;
541 }
542 ret = consumerd_recv_fd(sock, tmp.payload_size, tmp.cmd_type);
543 if (ret < 0) {
544 continue;
545 }
546 }
547
548error:
549 return NULL;
550}
551
552/*
553 * update_poll_array
554 *
555 * Allocate the pollfd structure and the local view of the out fds
556 * to avoid doing a lookup in the linked list and concurrency issues
557 * when writing is needed.
558 * Returns the number of fds in the structures
559 */
560static int update_poll_array(struct pollfd **pollfd,
561 struct ltt_kconsumerd_fd **local_kconsumerd_fd)
562{
563 struct ltt_kconsumerd_fd *iter;
564 int i = 0;
565
566 if (*pollfd != NULL) {
567 free(*pollfd);
568 *pollfd = NULL;
569 }
570
571 if (*local_kconsumerd_fd != NULL) {
572 free(*local_kconsumerd_fd);
573 *local_kconsumerd_fd = NULL;
574 }
575
576 *pollfd = malloc(fds_count * sizeof(struct pollfd));
577 if (*pollfd == NULL) {
578 perror("pollfd malloc");
579 goto error_mem;
580 }
581
582 *local_kconsumerd_fd = malloc(fds_count * sizeof(struct ltt_kconsumerd_fd));
583 if (*local_kconsumerd_fd == NULL) {
584 perror("local_kconsumerd_fd malloc");
585 goto error_mem;
586 }
587
588 DBG("Updating poll fd array");
589 pthread_mutex_lock(&kconsumerd_lock_fds);
590
591 cds_list_for_each_entry(iter, &kconsumerd_fd_list.head, list) {
592 DBG("Inside for each");
593 if (iter->state == ACTIVE_FD) {
594 DBG("Active FD %d", iter->consumerd_fd);
595 pollfd[i]->fd = iter->consumerd_fd;
596 pollfd[i]->events = POLLIN | POLLPRI;
597 local_kconsumerd_fd[i] = iter;
598 i++;
599 } else if (iter->state == DELETE_FD) {
600 del_fd(iter);
601 }
602 }
603 update_fd_array = 0;
604 pthread_mutex_unlock(&kconsumerd_lock_fds);
605 return i;
606
607error_mem:
608 return -ENOMEM;
609}
610
611/*
612 * thread_poll_fds
613 *
614 * This thread polls the fds in the ltt_fd_list to consume the data
615 * and write it to tracefile if necessary.
616 */
617static void *thread_poll_fds(void *data)
618{
619 int num_rdy, num_hup, high_prio, ret, i;
620 struct pollfd *pollfd = NULL;
621 /* local view of the fds */
622 struct ltt_kconsumerd_fd *local_kconsumerd_fd = NULL;
623 /* local view of fds_count */
624 int nb_fd = 0;
625
626 ret = pipe(thread_pipe);
627 if (ret < 0) {
628 perror("Error creating pipe");
629 goto end;
630 }
631
632 while (1) {
633 high_prio = 0;
634 num_hup = 0;
635
636 /*
637 * the ltt_fd_list has been updated, we need to update our
638 * local array as well
639 */
640 if (update_fd_array) {
641 ret = update_poll_array(&pollfd, &local_kconsumerd_fd);
642 if (ret < 0) {
643 ERR("Error in allocating pollfd or local_outfds");
644 send_error(KCONSUMERD_POLL_ERROR);
645 goto end;
646 }
647 nb_fd = ret;
648 }
649
650 /* poll on the array of fds */
651 DBG("polling on %d fd", nb_fd);
652 num_rdy = poll(pollfd, nb_fd, POLL_TIMEOUT);
653 DBG("poll num_rdy : %d", num_rdy);
654 if (num_rdy == -1) {
655 perror("Poll error");
656 send_error(KCONSUMERD_POLL_ERROR);
657 goto end;
658 }
659
660 /* Take care of high priority channels first. */
661 for (i = 0; i < nb_fd; i++) {
662 switch(pollfd[i].revents) {
663 case POLLERR:
664 ERR("Error returned in polling fd %d.", pollfd[i].fd);
665 num_hup++;
666 send_error(KCONSUMERD_POLL_ERROR);
667 break;
668 case POLLHUP:
669 ERR("Polling fd %d tells it has hung up.", pollfd[i].fd);
670 num_hup++;
671 break;
672 case POLLNVAL:
673 ERR("Polling fd %d tells fd is not open.", pollfd[i].fd);
674 send_error(KCONSUMERD_POLL_NVAL);
675 num_hup++;
676 break;
677 case POLLPRI:
678 DBG("Urgent read on fd %d", pollfd[i].fd);
679 high_prio = 1;
680 ret = read_subbuffer(&local_kconsumerd_fd[i]);
681 /* it's ok to have an unavailable sub-buffer (FIXME : is it ?) */
682 if (ret == EAGAIN) {
683 ret = 0;
684 }
685 break;
686 }
687 }
688
689 /* If every buffer FD has hung up, we end the read loop here */
690 if (nb_fd > 0 && num_hup == nb_fd) {
691 DBG("every buffer FD has hung up\n");
692 send_error(KCONSUMERD_POLL_HUP);
693 continue;
694 }
695
696 /* Take care of low priority channels. */
697 if (!high_prio) {
698 for (i = 0; i < nb_fd; i++) {
699 switch(pollfd[i].revents) {
700 case POLLIN:
701 DBG("Normal read on fd %d", pollfd[i].fd);
702 ret = read_subbuffer(&local_kconsumerd_fd[i]);
703 /* it's ok to have an unavailable subbuffer (FIXME : is it ?) */
704 if (ret == EAGAIN) {
705 ret = 0;
706 }
707 break;
708 }
709 }
710 }
711 }
712end:
713 if (pollfd != NULL) {
714 free(pollfd);
715 pollfd = NULL;
716 }
717 if (local_kconsumerd_fd != NULL) {
718 free(local_kconsumerd_fd);
719 local_kconsumerd_fd = NULL;
720 }
721 return NULL;
722}
723
724/*
725 * usage function on stderr
726 */
727static void usage(void)
728{
729 fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname);
730 fprintf(stderr, " -h, --help "
731 "Display this usage.\n");
732 fprintf(stderr, " -c, --kconsumerd-cmd-sock PATH "
733 "Specify path for the command socket\n");
734 fprintf(stderr, " -e, --kconsumerd-err-sock PATH "
735 "Specify path for the error socket\n");
736 fprintf(stderr, " -d, --daemonize "
737 "Start as a daemon.\n");
738 fprintf(stderr, " -q, --quiet "
739 "No output at all.\n");
740 fprintf(stderr, " -v, --verbose "
741 "Verbose mode. Activate DBG() macro.\n");
742 fprintf(stderr, " -V, --version "
743 "Show version number.\n");
744}
745
746/*
747 * daemon argument parsing
748 */
749static void parse_args(int argc, char **argv)
750{
751 int c;
752
753 static struct option long_options[] = {
754 { "kconsumerd-cmd-sock", 1, 0, 'c' },
755 { "kconsumerd-err-sock", 1, 0, 'e' },
756 { "daemonize", 0, 0, 'd' },
757 { "help", 0, 0, 'h' },
758 { "quiet", 0, 0, 'q' },
759 { "verbose", 0, 0, 'v' },
760 { "version", 0, 0, 'V' },
761 { NULL, 0, 0, 0 }
762 };
763
764 while (1) {
765 int option_index = 0;
766 c = getopt_long(argc, argv, "dhqvV" "c:e:", long_options, &option_index);
767 if (c == -1) {
768 break;
769 }
770
771 switch (c) {
772 case 0:
773 fprintf(stderr, "option %s", long_options[option_index].name);
774 if (optarg) {
775 fprintf(stderr, " with arg %s\n", optarg);
776 }
777 break;
778 case 'c':
779 snprintf(command_sock_path, PATH_MAX, "%s", optarg);
780 break;
781 case 'e':
782 snprintf(error_sock_path, PATH_MAX, "%s", optarg);
783 break;
784 case 'd':
785 opt_daemon = 1;
786 break;
787 case 'h':
788 usage();
789 exit(EXIT_FAILURE);
790 case 'q':
791 opt_quiet = 1;
792 break;
793 case 'v':
794 opt_verbose = 1;
795 break;
796 case 'V':
797 fprintf(stdout, "%s\n", VERSION);
798 exit(EXIT_SUCCESS);
799 default:
800 usage();
801 exit(EXIT_FAILURE);
802 }
803 }
804}
805
806
807/*
808 * main
809 */
810int main(int argc, char **argv)
811{
812 int i;
813 int ret = 0;
814 void *status;
815
816 /* Parse arguments */
817 progname = argv[0];
818 parse_args(argc, argv);
819
820 /* Daemonize */
821 if (opt_daemon) {
822 ret = daemon(0, 0);
823 if (ret < 0) {
824 perror("daemon");
825 goto error;
826 }
827 }
828
829 if (strlen(command_sock_path) == 0) {
830 snprintf(command_sock_path, PATH_MAX,
831 KCONSUMERD_CMD_SOCK_PATH);
832 }
833 if (strlen(error_sock_path) == 0) {
834 snprintf(error_sock_path, PATH_MAX,
835 KCONSUMERD_ERR_SOCK_PATH);
836 }
837
838 if (set_signal_handler() < 0) {
839 goto error;
840 }
841
842 /* Connect to the socket created by ltt-sessiond to report errors */
843 DBG("Connecting to error socket %s", error_sock_path);
844 error_socket = lttcomm_connect_unix_sock(error_sock_path);
845 /* not a fatal error, but all communication with ltt-sessiond will fail */
846 if (error_socket < 0) {
847 WARN("Cannot connect to error socket, is ltt-sessiond started ?");
848 }
849
850 /* Create the thread to manage the receive of fd */
851 ret = pthread_create(&threads[0], NULL, thread_receive_fds, (void *) NULL);
852 if (ret != 0) {
853 perror("pthread_create");
854 goto error;
855 }
856
857 /* Create thread to manage the polling/writing of traces */
858 ret = pthread_create(&threads[1], NULL, thread_poll_fds, (void *) NULL);
859 if (ret != 0) {
860 perror("pthread_create");
861 goto error;
862 }
863
864 for (i = 0; i < 2; i++) {
865 ret = pthread_join(threads[i], &status);
866 if (ret != 0) {
867 perror("pthread_join");
868 goto error;
869 }
870 }
871 ret = EXIT_SUCCESS;
872 send_error(KCONSUMERD_EXIT_SUCCESS);
873 goto end;
874
875error:
876 ret = EXIT_FAILURE;
877 send_error(KCONSUMERD_EXIT_FAILURE);
878
879end:
880 cleanup();
881
882 return ret;
883}
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