1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 #include "lint.h" 30 #include <stdlib.h> 31 #include <errno.h> 32 33 /* 34 * SUSv3 - aligned memory allocation 35 * 36 * From the SUSv3 specification: 37 * The value of alignment shall be a power 38 * of two multiple of sizeof (void *). 39 * This is enforced below. 40 * 41 * From the SUSv3 specification: 42 * If the size of the space requested is 0, the behavior 43 * is implementation-defined; the value returned in memptr 44 * shall be either a null pointer or a unique pointer. 45 * We choose always to return a null pointer in this case. 46 * (Not all implementations of memalign() behave this way.) 47 */ 48 int 49 posix_memalign(void **memptr, size_t alignment, size_t size) 50 { 51 void *ptr = NULL; 52 int error = 0; 53 54 if (alignment == 0 || 55 (alignment & (sizeof (void *) - 1)) != 0 || 56 (alignment & (alignment - 1)) != 0) 57 error = EINVAL; 58 else if (size != 0 && 59 (ptr = memalign(alignment, size)) == NULL) 60 error = ENOMEM; 61 62 *memptr = ptr; 63 return (error); 64 } 65