1/* 2 * Copyright (c) 2004 Apple Computer, Inc. All rights reserved. 3 * 4 * @APPLE_LICENSE_HEADER_START@ 5 * 6 * This file contains Original Code and/or Modifications of Original Code 7 * as defined in and that are subject to the Apple Public Source License 8 * Version 2.0 (the 'License'). You may not use this file except in 9 * compliance with the License. Please obtain a copy of the License at 10 * http://www.opensource.apple.com/apsl/ and read it before using this 11 * file. 12 * 13 * The Original Code and all software distributed under the License are 14 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 15 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 16 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 17 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 18 * Please see the License for the specific language governing rights and 19 * limitations under the License. 20 * 21 * @APPLE_LICENSE_HEADER_END@ 22 */ 23 24#ifndef NO_SYSCALL_LEGACY 25 26#define _NONSTD_SOURCE 27#include <sys/cdefs.h> 28 29#include <sys/types.h> 30#include <sys/mman.h> 31#include <mach/vm_param.h> 32 33/* 34 * Stub function to account for the differences in standard compliance 35 * while maintaining binary backward compatibility. 36 * 37 * This is only the legacy behavior. 38 */ 39extern int __munmap(void *, size_t); 40 41int 42munmap(void *addr, size_t len) 43{ 44 size_t offset; 45 46 if (len == 0) { 47 /* 48 * Standard compliance now requires the system to return EINVAL 49 * for munmap(addr, 0). Return success now to maintain 50 * backwards compatibility. 51 */ 52 return 0; 53 } 54 /* 55 * Page-align "addr" since the system now requires it 56 * for standards compliance. 57 * Update "len" to reflect the adjustment and still cover the same area. 58 */ 59 offset = ((uintptr_t) addr) & PAGE_MASK; 60 addr = (void *) (((uintptr_t) addr) & ~PAGE_MASK); 61 len += offset; 62 return __munmap(addr, len); 63} 64 65#endif /* NO_SYSCALL_LEGACY */ 66