From fb76083ae2c2c518374309576a3a0fe4f9d1697c Mon Sep 17 00:00:00 2001
From: ache <ache@FreeBSD.org>
Date: Mon, 23 Apr 2001 02:29:10 +0000
Subject: Add sranddev() since srand() is not vary much with seed, typical time

---
 lib/libc/stdlib/rand.3 | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

(limited to 'lib/libc/stdlib/rand.3')

diff --git a/lib/libc/stdlib/rand.3 b/lib/libc/stdlib/rand.3
index b47ff67..67955d9 100644
--- a/lib/libc/stdlib/rand.3
+++ b/lib/libc/stdlib/rand.3
@@ -42,6 +42,7 @@
 .Sh NAME
 .Nm rand ,
 .Nm srand ,
+.Nm sranddev ,
 .Nm rand_r
 .Nd bad random number generator
 .Sh LIBRARY
@@ -50,6 +51,8 @@
 .Fd #include <stdlib.h>
 .Ft void
 .Fn srand "unsigned seed"
+.Ft void
+.Fn sranddev void
 .Ft int
 .Fn rand void
 .Ft int
@@ -83,6 +86,13 @@ If no
 value is provided, the functions are automatically
 seeded with a value of 1.
 .Pp
+The
+.Fn sranddev
+routine initialize a seed using
+.Xr urandom 4
+random number device which returns good random numbers,
+suitable for cryptographic use.
+.Pp
 .Fn rand_r
 provides the same functionality as
 .Fn rand .
@@ -90,7 +100,8 @@ A pointer to the context value
 .Fa ctx
 must be supplied by the caller.
 .Sh SEE ALSO
-.Xr random 3
+.Xr random 3 ,
+.Xr urandom 4
 .Sh STANDARDS
 The
 .Fn rand
-- 
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