tools/test/devrandom/hammer.random

   1 #!/usr/pkg/bin/perl
   2
   3 #
   4 # Test program for /dev/random
   5 # Read and display random numbers.
   6 # Try tapping shift/alt/ctrl to get more randomness.
   7 #
   8 # $FreeBSD: src/tools/test/devrandom/hammer.random,v 1.4 1999/08/28 00:54:24 peter Exp $
   9 # $DragonFly: src/tools/test/devrandom/hammer.random,v 1.2 2003/06/17 04:29:11 dillon Exp $
  10 #
  11
  12 for (;;) {
  13         open(BIN, "/dev/random") || die "Cannot open /dev/random - $!\n";
  14         $len = sysread(BIN, $a, 128);
  15         close(BIN);
  16         if ($len > 0) {
  17                 print "$len bytes read: ";
  18                 for ($j = 0; $j < $len; $j++) {
  19                         $k = unpack("C", substr($a, $j, 1));
  20                         printf("%.2X ", $k);
  21                 }
  22                 printf "\n";
  23         }
  24 }