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      # well, if we can't force it even now, try exit 255
      $? = 255;
   } else {
      # exit status
      $? = $EXIT_STATUS;
   }

}

sub on_exit(&) {
   unless ($AnyEvent::Watchdog::end) {
      $AnyEvent::Watchdog::end = \&_exit;

      push @ON_EXIT, $_[0];

      for my $signal (qw(TERM INT XFSZ XCPU)) {
         my $signum = AnyEvent::Base::sig2num $signal
            or next;
         $SIG_W{$signum} = AE::signal $signal => sub {
            $EXIT_STATUS = [$signal => $signum];