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 #include "lint.h" 28 29 #include <sys/sysmacros.h> 30 31 #include <stdlib.h> 32 #include <errno.h> 33 34 /* 35 * SUSv3 - aligned memory allocation 36 * 37 * From the SUSv3 specification: 38 * The value of alignment shall be a power 39 * of two multiple of sizeof (void *). 40 * This is enforced below. 41 * 42 * From the SUSv3 specification: 43 * If the size of the space requested is 0, the behavior 44 * is implementation-defined; the value returned in memptr 45 * shall be either a null pointer or a unique pointer. 46 * We choose always to return a null pointer in this case. 47 * (Not all implementations of memalign() behave this way.) 48 */ 49 int 50 posix_memalign(void **memptr, size_t alignment, size_t size) 51 { 52 void *ptr = NULL; 53 54 if ((alignment == 0) || !ISP2(alignment) || 55 (alignment & (sizeof (void *) - 1)) != 0) { 56 return (EINVAL); 57 } else if (size == 0) { 58 *memptr = NULL; 59 return (0); 60 } else { 61 if ((ptr = memalign(alignment, size)) == NULL) { 62 return (ENOMEM); 63 } else { 64 *memptr = ptr; 65 return (0); 66 } 67 } 68 } 69