sub DB::get_fork_TTY {

  require File::Temp or return '';

  my ( $FH, $filename ) = File::Temp::tempfile( UNLINK => 1 );

  system( qq{screen -t 'Child $$' sh -c "tty > $filename ; sleep 1000000"} ) == 0
    or return '';

  chomp ( my $tty = <$FH> );

  return $tty;
}