tools/test/devrandom/hammer.urandom

   1 #!/usr/pkg/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 # $DragonFly: src/tools/test/devrandom/hammer.urandom,v 1.2 2003/06/17 04:29:11 dillon Exp $
  10 #
  11
  12 open(ZERO, "/dev/zero") || die "Cannot open /dev/zero - $!\n";
  13
  14 for (;;) {
  15         open(BIN, "/dev/urandom");
  16         $len = sysread(BIN, $a, 20);
  17         sysread(ZERO, $b, 20);
  18         close(BIN);
  19         if ($len > 0) {
  20                 for ($j = 0; $j < $len; $j += 2) {
  21                         $k = unpack("S", substr($a, $j, 2));
  22                         $z = unpack("S", substr($b, $j, 2));
  23                         $z == 0 || die "/dev/zero is returning non-zero!\n";
  24                         printf("%.4X ", $k);
  25                 }
  26                 printf "\n";
  27         }
  28 }