Initial import from FreeBSD RELENG_4:
[dragonfly.git] / tools / test / devrandom / hammer.urandom
CommitLineData
984263bc
MD
1#!/usr/bin/perl
2
3#
4# Test program for /dev/urandom
5# Read and display random numbers.
6# This also reads /dev/zero to make sure there is no brokenness there.
7#
8# $FreeBSD: src/tools/test/devrandom/hammer.urandom,v 1.4 1999/08/28 00:54:24 peter Exp $
9#
10
11open(ZERO, "/dev/zero") || die "Cannot open /dev/zero - $!\n";
12
13for (;;) {
14 open(BIN, "/dev/urandom");
15 $len = sysread(BIN, $a, 20);
16 sysread(ZERO, $b, 20);
17 close(BIN);
18 if ($len > 0) {
19 for ($j = 0; $j < $len; $j += 2) {
20 $k = unpack("S", substr($a, $j, 2));
21 $z = unpack("S", substr($b, $j, 2));
22 $z == 0 || die "/dev/zero is returning non-zero!\n";
23 printf("%.4X ", $k);
24 }
25 printf "\n";
26 }
27}