65 lines
2.0 KiB
C
65 lines
2.0 KiB
C
/*-
|
|
* Copyright (c) 2014 Juan Romero Pardines.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
|
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <errno.h>
|
|
#include <sys/stat.h>
|
|
#include <fcntl.h>
|
|
|
|
#include "defs.h"
|
|
|
|
sem_t *
|
|
index_lock(void)
|
|
{
|
|
sem_t *sem;
|
|
/*
|
|
* Create/open the POSIX named semaphore.
|
|
*/
|
|
sem = sem_open(_XBPS_RINDEX_SEMNAME, O_CREAT, 0660, 1);
|
|
if (sem == SEM_FAILED) {
|
|
fprintf(stderr, "%s: failed to create/open named "
|
|
"semaphore: %s\n", _XBPS_RINDEX, strerror(errno));
|
|
return NULL;
|
|
}
|
|
if (sem_wait(sem) == -1) {
|
|
fprintf(stderr, "%s: failed to lock named semaphore: %s\n",
|
|
_XBPS_RINDEX, strerror(errno));
|
|
return NULL;
|
|
}
|
|
|
|
return sem;
|
|
}
|
|
|
|
void
|
|
index_unlock(sem_t *sem)
|
|
{
|
|
/* Unblock semaphore, close and destroy it (if possible) */
|
|
sem_post(sem);
|
|
sem_close(sem);
|
|
sem_unlink(_XBPS_RINDEX_SEMNAME);
|
|
}
|