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#!/usr/bin/perl
#
# Test program for /dev/urandom
# Read and display random numbers.
# This also reads /dev/zero to make sure there is no brokenness there.
#
# $Id$
#
open(ZERO, "/dev/zero") || die "Cannot open /dev/zero - $!\n";
for (;;) {
open(BIN, "/dev/urandom");
$len = sysread(BIN, $a, 20);
sysread(ZERO, $b, 20);
close(BIN);
if ($len > 0) {
for ($j = 0; $j < $len; $j += 2) {
$k = unpack("S", substr($a, $j, 2));
$z = unpack("S", substr($b, $j, 2));
$z == 0 || die "/dev/zero is returning non-zero!\n";
printf("%.4X ", $k);
}
printf "\n";
}
}
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