my $p = Net::Ping->new("icmp",$timeout,32);
while (1) {
   foreach my $host (@hosts) {
      my @times;
      for (1..4) {
         my $t0 = [gettimeofday];
         my $alive = $p->ping($host);
         my $t1 = tv_interval ($t0, [gettimeofday]);
         push @times, 
            $alive ?             # was ping successful?
            int($t1 * 1000) :    # if so, record interval
            $timeout * 1000;     # if not, record timeout val
      }
      my ($sec, $min, $hr, $day, $month, $year) = (localtime)[0..5];
      my $timestamp = sprintf("%04d-%02d-%02d,%02d:%02d:%02d",
         $year + 1900, $month + 1, $day, $hr, $min, $sec);
      print "$timestamp,$host,", join ( ',', @times ), "\n";
   }
   sleep $yawn;
}