shm.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2004 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
#include "synonyms.h"
#include <sys/types.h>
#include <sys/mman.h>
#include <fcntl.h>
#include <limits.h>
#include <errno.h>
#include "pos4obj.h"
int
shm_open(const char *path, int oflag, mode_t mode)
{
int flag, fd, flags;
if (__pos4obj_check(path) == -1) {
return (-1);
}
/* acquire semaphore lock to have atomic operation */
if ((__pos4obj_lock(path, SHM_LOCK_TYPE)) < 0) {
return (-1);
}
fd = __pos4obj_open(path, SHM_DATA_TYPE, oflag, mode, &flag);
if (fd < 0) {
(void) __pos4obj_unlock(path, SHM_LOCK_TYPE);
return (-1);
}
if ((flags = fcntl(fd, F_GETFD)) < 0) {
(void) __pos4obj_unlock(path, SHM_LOCK_TYPE);
return (-1);
}
if ((fcntl(fd, F_SETFD, flags|FD_CLOEXEC)) < 0) {
(void) __pos4obj_unlock(path, SHM_LOCK_TYPE);
return (-1);
}
/* relase semaphore lock operation */
if (__pos4obj_unlock(path, SHM_LOCK_TYPE) < 0) {
return (-1);
}
return (fd);
}
int
shm_unlink(const char *path)
{
int oerrno;
int err;
if (__pos4obj_check(path) < 0)
return (-1);
if (__pos4obj_lock(path, SHM_LOCK_TYPE) < 0)
return (-1);
err = __pos4obj_unlink(path, SHM_DATA_TYPE);
oerrno = errno;
(void) __pos4obj_unlock(path, SHM_LOCK_TYPE);
errno = oerrno;
return (err);
}