/*

 * 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.

 */

#pragma ident	"%Z%%M%	%I%	%E% SMI"

#include "lint.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;

	int error = 0;

	if (alignment == 0 ||

	    (alignment & (sizeof (void *) - 1)) != 0 ||

	    (alignment & (alignment - 1)) != 0)

		error = EINVAL;

	else if (size != 0 &&

	    (ptr = memalign(alignment, size)) == NULL)

		error = ENOMEM;

	*memptr = ptr;

	return (error);

}