43 lines
1.5 KiB
C
43 lines
1.5 KiB
C
/* $NetBSD: magic.h,v 1.2 2003/12/04 16:23:36 drochner Exp $ */
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/*
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* Copyright (C) 1999-2001 Internet Software Consortium.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM
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* DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
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* INTERNET SOFTWARE CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT,
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* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
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* FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
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* NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
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* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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/* Id: magic.h,v 1.11 2001/01/09 21:57:10 bwelling Exp */
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#ifndef ISC_MAGIC_H
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#define ISC_MAGIC_H 1
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typedef struct {
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unsigned int magic;
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} isc__magic_t;
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/*
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* To use this macro the magic number MUST be the first thing in the
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* structure, and MUST be of type "unsigned int".
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*
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* The intent of this is to allow magic numbers to be checked even though
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* the object is otherwise opaque.
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*/
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#define ISC_MAGIC_VALID(a,b) (((a) != NULL) && \
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(((const isc__magic_t *)(a))->magic == (b)))
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#define ISC_MAGIC(a, b, c, d) ((a) << 24 | (b) << 16 | (c) << 8 | (d))
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#endif /* ISC_MAGIC_H */
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