mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-17 10:26:15 +00:00
28 lines
582 B
Perl
28 lines
582 B
Perl
#!/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.
|
|
#
|
|
# $FreeBSD$
|
|
#
|
|
|
|
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";
|
|
}
|
|
}
|