/contrib/ntp/include/isc/magic.h
https://bitbucket.org/freebsd/freebsd-head/ · C++ Header · 40 lines · 9 code · 7 blank · 24 comment · 3 complexity · 5d4e3b51b4e666c9c62b623871d7a464 MD5 · raw file
- /*
- * 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 */