xnu-6153.141.1.tar.gz

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

diff --git a/bsd/libkern/random.c b/bsd/libkern/random.c
index cb2b6ec9d68cece8c6f030c303a44ca272d3b9e5..8b5521a358569c05148551aede2bd34a7b4e18f5 100644 (file)
--- a/bsd/libkern/random.c
+++ b/bsd/libkern/random.c
@@ -2,7 +2,7 @@
  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
  *
  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
- * 
+ *
  * 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
@@ -11,10 +11,10 @@
  * 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.
- * 
+ *
  * 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,
@@ -22,7 +22,7 @@
  * 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_OSREFERENCE_LICENSE_HEADER_END@
  */
 /*-
@@ -62,15 +62,18 @@
 
 #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,
  * and whatever else we might use it for.  The result is uniform on
  * [0, 2^31 - 1].
  */
-u_long
-random()
+u_int32_t
+random(void)
 {
-       return RandomULong();
+       /* Zero all but bottom 31 bits, also works for 64-bit longs */
+       u_int32_t mask = (u_int32_t)-1 >> ((sizeof(u_int32_t) * 8) - 31);
+       return mask & RandomULong();
 }
-