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/*
* Copyright (C) 2004-2007 Internet Systems Consortium, Inc. ("ISC")
* Copyright (C) 1999-2001 Internet Software Consortium.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
* OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*/
/* $Id: magic.h,v 1.18 2007-06-19 23:47:18 tbox Exp $ */
#ifndef ISC_MAGIC_H
#define ISC_MAGIC_H 1
/*! \file isc/magic.h */
typedef struct {
unsigned int magic;
} isc__magic_t;
/*%
* To use this macro the magic number MUST be the first thing in the
* structure, and MUST be of type "unsigned int".
* The intent of this is to allow magic numbers to be checked even though
* the object is otherwise opaque.
*/
#define ISC_MAGIC_VALID(a,b) (((a) != NULL) && \
(((const isc__magic_t *)(a))->magic == (b)))
#define ISC_MAGIC(a, b, c, d) ((a) << 24 | (b) << 16 | (c) << 8 | (d))
#endif /* ISC_MAGIC_H */
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