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Current Path : /proc/2/cwd/usr/include/isc/
Current File : //proc/2/cwd/usr/include/isc/magic.h
/*
 * 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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