my $PID;
BEGIN {
  $PID = getpid();
}

SIG{TERM} = sub __set_semaphor {
   open my $sema, '>', "$PID.semaphor";
   print $sema 1;
   close $sema;
   
   return 1;
};

# bei Terminierung hier Aufräumen, später Dateien etc schließen, was weiß ich was du noch machst...
sub __cleanup {
	my $self = shift;
	
	sleep(10);
    unlink "$PID.semaphor"; 
	
	1;
}

sub process {
    my $self = shift;
    my($cmd, @args);
    
    my $sock = $self->{SOCK};    
    while(my $line = <$sock>) {
	
		# check for termination semaphore
		if ( open my $sema, '<', "$PID.semaphor") {
			my $terminated = <$sema>;
			if ($terminated =~ /^1/) {
				$self->_put("451 4.7.1 Service unavailable - try again later;");
				
				$self->__cleanup();
				
				exit(255); # end client
			}
		}

$Net::SMTP::Server::Client::DEBUG and print STDOUT $line;

                # Clean up.
                chomp $line;
                $line =~ s/^\s+//;
                $line =~ s/\s+$//;
                if (!length $line) {
                        $self->_put("500 Learn to type!");
                        next;
                }
                
                ($cmd, @args) = split(/\s+/,$line);
                
                $cmd =~ tr/a-z/A-Z/;
                
                if( !defined $_cmds{$cmd} ) {
                        $self->_put("500 Learn to type!");
                        next;
                }
                
                return(defined($self->{MSG}) ? 1 : 0) unless
                        &{$_cmds{$cmd}}($self, \@args);
    }

    return undef;
}