Libraries updates and cleanup

* Updating common/lib
 * Updating lib/csu
 * Updating lib/libc
 * Updating libexec/ld.elf_so
 * Corrected test on __minix in featuretest to actually follow the
   meaning of the comment.
 * Cleaned up _REENTRANT-related defintions.
 * Disabled -D_REENTRANT for libfetch
 * Removing some unneeded __NBSD_LIBC defines and tests

Change-Id: Ic1394baef74d11b9f86b312f5ff4bbc3cbf72ce2

lib/libc/gen/arc4random.3

@@ -1,4 +1,4 @@
-.\"	$NetBSD: arc4random.3,v 1.7 2005/12/26 19:40:14 perry Exp $
+.\"	$NetBSD: arc4random.3,v 1.9 2011/02/05 00:24:08 wiz Exp $
 .\" $OpenBSD: arc4random.3,v 1.17 2000/12/21 14:07:41 aaron Exp $
 .\"
 .\" Copyright 1997 Niels Provos <provos@physnet.uni-hamburg.de>
@@ -31,11 +31,13 @@
 .\"
 .\" Manual page, using -mandoc macros
 .\"
-.Dd April 15, 1997
+.Dd February 4, 2011
 .Dt ARC4RANDOM 3
 .Os
 .Sh NAME
 .Nm arc4random ,
+.Nm arc4random_buf ,
+.Nm arc4random_uniform ,
 .Nm arc4random_stir ,
 .Nm arc4random_addrandom
 .Nd arc4 random number generator
@@ -46,6 +48,10 @@
 .Ft uint32_t
 .Fn arc4random "void"
 .Ft void
+.Fn arc4random_buf "void *buffer" "size_t length"
+.Ft uint32_t
+.Fn arc4random_uniform "uint32_t upper_bound"
+.Ft void
 .Fn arc4random_stir "void"
 .Ft void
 .Fn arc4random_addrandom "u_char *dat" "int datlen"
@@ -77,6 +83,20 @@ and
 .Xr drand48 3 .
 .Pp
 The
+.Fn arc4random_buf
+function fills the
+.Fa buffer
+with
+.Fa length
+bytes of ARC4-derived random data.
+.Pp
+The
+.Fn arc4random_uniform
+function returns a uniformly distributed random number less than
+.Fa upper_bound
+avoiding modulo bias when the upper bound is not a power of two.
+.Pp
+The
 .Fn arc4random_stir
 function reads data from
 .Pa /dev/urandom