#!/usr/bin/perl
package MyServer;
use vars qw(@ISA);
use strict;
use Net::Server;
use Net::Server::PreFork;
@ISA = qw(Net::Server::PreFork);
### run the server
MyServer->run();
exit;

sub configure_hook {
  my $self = shift;  
  $self->{server}->{port}   = ['*:1234']; # 
  $self->{server}->{chdir}  = 'datadir'; #
  $self->{server}->{setsid} = 1; # 
}

sub process_request {
  my $self = shift;
  my $prop = $self->{server};
  my $addr= $prop->{peeraddr};
  local %ENV = ();
  my $line = <STDIN>;
  &getdatafile($addr,$line);
}

sub getdatafile {
#...
}