/* * Copyright (C) 1999-2001 Internet Software Consortium. * * Permission to use, copy, modify, and 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 INTERNET SOFTWARE CONSORTIUM * DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL * INTERNET SOFTWARE CONSORTIUM 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 1.11 2001/01/09 21:57:10 bwelling Exp $ */ #ifndef ISC_MAGIC_H #define ISC_MAGIC_H 1 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 */