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author | Martin Nagy <mnagy@redhat.com> | 2008-12-09 19:31:51 +0100 |
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committer | Martin Nagy <mnagy@redhat.com> | 2008-12-09 19:31:51 +0100 |
commit | 9b941ce45484431bf095ffc39f242e81c716cbd5 (patch) | |
tree | 5e9fb4d5945e88d78d61591cdd803e8174520f81 /lib/isc/include/isc/magic.h | |
download | bind_dynamic-bind-9-6-0-rc1.tar.gz bind_dynamic-bind-9-6-0-rc1.tar.xz bind_dynamic-bind-9-6-0-rc1.zip |
Initial import.bind-9-6-0-rc1
Diffstat (limited to 'lib/isc/include/isc/magic.h')
-rw-r--r-- | lib/isc/include/isc/magic.h | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/lib/isc/include/isc/magic.h b/lib/isc/include/isc/magic.h new file mode 100644 index 0000000..073de90 --- /dev/null +++ b/lib/isc/include/isc/magic.h @@ -0,0 +1,41 @@ +/* + * 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 */ |