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 */