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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (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 2008 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#include "lint.h"
#include <sys/sysmacros.h>
#include <stdlib.h>
#include <errno.h>
/*
* SUSv3 - aligned memory allocation
*
* From the SUSv3 specification:
* The value of alignment shall be a power
* of two multiple of sizeof (void *).
* This is enforced below.
*
* From the SUSv3 specification:
* If the size of the space requested is 0, the behavior
* is implementation-defined; the value returned in memptr
* shall be either a null pointer or a unique pointer.
* We choose always to return a null pointer in this case.
* (Not all implementations of memalign() behave this way.)
*/
int
posix_memalign(void **memptr, size_t alignment, size_t size)
{
void *ptr = NULL;
if ((alignment == 0) || !ISP2(alignment) ||
(alignment & (sizeof (void *) - 1)) != 0) {
return (EINVAL);
} else if (size == 0) {
*memptr = NULL;
return (0);
} else {
if ((ptr = memalign(alignment, size)) == NULL) {
return (ENOMEM);
} else {
*memptr = ptr;
return (0);
}
}
}
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