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 "_errno.h" 30#include <sys/types.h> 31#include <sys/mman.h> 32#include <mach/vm_param.h> 33 34/* 35 * Stub function to account for the differences in standard compliance 36 * while maintaining binary backward compatibility. 37 * 38 * This is only the legacy behavior. 39 */ 40extern int __mprotect(void *, size_t, int); 41 42int 43mprotect(void *addr, size_t len, int prot) 44{ 45 void *aligned_addr; 46 size_t offset; 47 int rv; 48 49 /* 50 * Page-align "addr" since the system now requires it 51 * for standards compliance. 52 * Update "len" to reflect the alignment. 53 */ 54 offset = ((uintptr_t) addr) & PAGE_MASK; 55 aligned_addr = (void *) (((uintptr_t) addr) & ~PAGE_MASK); 56 len += offset; 57 rv = __mprotect(aligned_addr, len, prot); 58 if (rv == -1 && errno == ENOMEM) { 59 /* 60 * Standards now require that we return ENOMEM if there was 61 * a hole in the address range. Panther and earlier used 62 * to return an EINVAL error, so honor backwards compatibility. 63 */ 64 errno = EINVAL; 65 } 66 return rv; 67} 68 69#endif /* NO_SYSCALL_LEGACY */ 70