/usr/share/perl5/Net/Server/Single.pm is in libnet-server-perl 0.99-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#
# Net::Server::Single - Net::Server personality
#
# $Id: Single.pm,v 1.4 2007/02/03 05:55:40 rhandom Exp $
#
# Copyright (C) 2001-2007
#
# Paul Seamons
# paul@seamons.com
# http://seamons.com/
#
# This package may be distributed under the terms of either the
# GNU General Public License
# or the
# Perl Artistic License
#
# All rights reserved.
#
################################################################
package Net::Server::Single;
use strict;
use vars qw($VERSION @ISA);
use Net::Server;
$VERSION = $Net::Server::VERSION; # done until separated
### fall back to parent methods
@ISA = qw(Net::Server);
### this module is simple a place holder so that
### Net::Server::MultiType can ask for Single as one of
### the fall back methods (which it does any way).
### Essentially all we are doing here is providing parallelism.
1;
__END__
=head1 NAME
Net::Server::Single - Net::Server personality
=head1 SYNOPSIS
use Net::Server::MultiType;
@ISA = qw(Net::Server::MultiType);
sub process_request {
#...code...
}
my @types = qw(PreFork Single Fork);
Net::Server::MultiType->run(server_type=>\@types);
=head1 DESCRIPTION
This module offers no functionality beyond the Net::Server
base class. This modules only purpose is to provide
parallelism for the MultiType personality.
See L<Net::Server>
=cut
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