xnu-1228.tar.gz

[apple/xnu.git] / bsd / libkern / random.c

diff --git a/bsd/libkern/random.c b/bsd/libkern/random.c
index 8a002af2c22aa1465e897724e1820c3d608cf48b..920ae5c609388878f884e729d675307129ad8c29 100644 (file)
--- a/bsd/libkern/random.c
+++ b/bsd/libkern/random.c
@@ -1,23 +1,29 @@
 /*
  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
  *
- * @APPLE_LICENSE_HEADER_START@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
  * 
- * The contents of this file constitute Original Code as defined in and
- * are subject to the Apple Public Source License Version 1.1 (the
- * "License").  You may not use this file except in compliance with the
- * License.  Please obtain a copy of the License at
- * http://www.apple.com/publicsource and read it before using this file.
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. The rights granted to you under the License
+ * may not be used to create, or enable the creation or redistribution of,
+ * unlawful or unlicensed copies of an Apple operating system, or to
+ * circumvent, violate, or enable the circumvention or violation of, any
+ * terms of an Apple operating system software license agreement.
  * 
- * This Original Code and all software distributed under the License are
- * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this file.
+ * 
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
- * License for the specific language governing rights and limitations
- * under the License.
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
  * 
- * @APPLE_LICENSE_HEADER_END@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  */
 /*-
  * Copyright (c) 1992, 1993
@@ -56,6 +62,8 @@
 
 #include <sys/types.h>
 #include <sys/random.h>
+#include <libkern/libkern.h>
+#include <dev/random/randomdev.h>
 
 /*
  * Pseudo-random number generator for randomizing the profiling clock,
@@ -63,8 +71,10 @@
  * [0, 2^31 - 1].
  */
 u_long
-random()
+random(void)
 {
-       return RandomULong();
+       /* Zero all but bottom 31 bits, also works for 64-bit longs */
+       u_long mask = (u_long)-1 >> ((sizeof(u_long) * 8) - 31);
+       return (mask & RandomULong());
 }