#!/usr/bin/perl
use warnings;
use strict;
use IPC::Open3;
use Tk;

my $pid = shift;
my $pid1 = open3(0, \*READ,0,"top -d 1 -b -p $pid ");
waitpid($pid1, 1);
my $sizeold = 0;

my $mw = new MainWindow;
$mw->overrideredirect(1);
my $t = $mw->Text(-width=>25, -height=>1, -bg=>'black',-fg=>'yellow')->pack;

my $id = Tk::After->new($mw,50,'repeat',\&refresh);

MainLoop;

sub refresh{
  my @words = split(/\s+/,<READ>);
  $words[0] ||= 0;
  if($words[0] =~ /$pid/){
              $t->delete('1.0','end');
              $t->insert('end',"PID: $pid ->  $words[4]");
              if($words[4] != $sizeold){print chr(07)}
              $sizeold = $words[4];
              }
}