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/*
* libEtPan! -- a mail stuff library
*
* Copyright (C) 2001, 2005 - DINH Viet Hoa
* 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.
* 3. Neither the name of the libEtPan! project nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``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 AUTHORS OR CONTRIBUTORS 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.
*/
/*
* $Id$
*/
#include "mailsem.h"
#include <semaphore.h>
#include <stdlib.h>
#include <stdio.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <fcntl.h>
enum {
SEMKIND_SEMOPEN,
SEMKIND_SEMINIT,
};
#define SEMNAME_LEN 64
struct mailsem * mailsem_new(void)
{
struct mailsem * sem;
int r;
sem = malloc(sizeof(* sem));
if (sem == NULL)
goto err;
r = sem_init(sem->sem_sem, 0, 0);
if (r < 0) {
char name[SEMNAME_LEN];
free(sem->sem_sem);
snprintf(name, sizeof(name), "sem-%p", sem);
#ifndef __CYGWIN__
sem->sem_sem = sem_open(name, O_CREAT, 0600, 0);
if (sem->sem_sem == NULL)
goto err;
sem->sem_kind = SEMKIND_SEMOPEN;
#else
goto err;
#endif
}
else {
sem->sem_kind = SEMKIND_SEMINIT;
}
return sem;
err:
return NULL;
}
void mailsem_free(struct mailsem * sem)
{
if (sem->sem_kind == SEMKIND_SEMOPEN) {
char name[SEMNAME_LEN];
#ifndef __CYGWIN__
sem_close((sem_t *) sem->sem_sem);
snprintf(name, sizeof(name), "sem-%p", sem);
sem_unlink(name);
#endif
}
else {
sem_destroy((sem_t *) sem->sem_sem);
free(sem->sem_sem);
}
free(sem);
}
int mailsem_up(struct mailsem * sem)
{
return sem_wait((sem_t *) sem->sem_sem);
}
int mailsem_down(struct mailsem * sem)
{
return sem_post((sem_t *) sem->sem_sem);
}
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