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Diffstat (limited to 'contrib/ntp/include/isc/magic.h')
-rw-r--r-- | contrib/ntp/include/isc/magic.h | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/contrib/ntp/include/isc/magic.h b/contrib/ntp/include/isc/magic.h new file mode 100644 index 0000000..ff3df24 --- /dev/null +++ b/contrib/ntp/include/isc/magic.h @@ -0,0 +1,40 @@ +/* + * 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 */ |