/* * Copyright (c) 2005-2008 Apple Computer, Inc. All rights reserved. * * @APPLE_LICENSE_HEADER_START@ * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in * compliance with the License. Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this * file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_LICENSE_HEADER_END@ */ #if !defined(_DYLD_INTERPOSING_H_) #define _DYLD_INTERPOSING_H_ /* * Example: * * static * int * my_open(const char* path, int flags, mode_t mode) * { * int value; * // do stuff before open (including changing the arguments) * value = open(path, flags, mode); * // do stuff after open (including changing the return value(s)) * return value; * } * DYLD_INTERPOSE(my_open, open) */ #define DYLD_INTERPOSE(_replacement,_replacee) \ __attribute__((used)) static struct{ const void* replacement; const void* replacee; } _interpose_##_replacee \ __attribute__ ((section ("__DATA,__interpose"))) = { (const void*)(unsigned long)&_replacement, (const void*)(unsigned long)&_replacee }; #endif