1258945Sroberto/* 2258945Sroberto * Copyright (C) 2004-2007 Internet Systems Consortium, Inc. ("ISC") 3258945Sroberto * Copyright (C) 1999-2001 Internet Software Consortium. 4258945Sroberto * 5258945Sroberto * Permission to use, copy, modify, and/or distribute this software for any 6258945Sroberto * purpose with or without fee is hereby granted, provided that the above 7258945Sroberto * copyright notice and this permission notice appear in all copies. 8258945Sroberto * 9258945Sroberto * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH 10258945Sroberto * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY 11258945Sroberto * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT, 12258945Sroberto * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM 13258945Sroberto * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE 14258945Sroberto * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR 15258945Sroberto * PERFORMANCE OF THIS SOFTWARE. 16258945Sroberto */ 17258945Sroberto 18258945Sroberto/* $Id: magic.h,v 1.18 2007/06/19 23:47:18 tbox Exp $ */ 19258945Sroberto 20258945Sroberto#ifndef ISC_MAGIC_H 21258945Sroberto#define ISC_MAGIC_H 1 22258945Sroberto 23258945Sroberto/*! \file isc/magic.h */ 24258945Sroberto 25258945Srobertotypedef struct { 26258945Sroberto unsigned int magic; 27258945Sroberto} isc__magic_t; 28258945Sroberto 29258945Sroberto 30258945Sroberto/*% 31258945Sroberto * To use this macro the magic number MUST be the first thing in the 32258945Sroberto * structure, and MUST be of type "unsigned int". 33258945Sroberto * The intent of this is to allow magic numbers to be checked even though 34258945Sroberto * the object is otherwise opaque. 35258945Sroberto */ 36258945Sroberto#define ISC_MAGIC_VALID(a,b) (((a) != NULL) && \ 37258945Sroberto (((const isc__magic_t *)(a))->magic == (b))) 38258945Sroberto 39258945Sroberto#define ISC_MAGIC(a, b, c, d) ((a) << 24 | (b) << 16 | (c) << 8 | (d)) 40258945Sroberto 41258945Sroberto#endif /* ISC_MAGIC_H */ 42