open ENSTAIL, "tail +0 -f $ENS_LOG |";
while ( not $done ) {
  eval {
    alarm 60;
    $$line = <ENSTAIL>;
    alarm 0;
    };
  if ($@) {
    if ( finishedReading() ) {
      close ENSTAIL;           # BLOCKED!
      $done = 1;   
      }
    }
  process( $line );
  }