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Edit: servent.pm
package Net::servent; use strict; use 5.006_001; our $VERSION = '1.02'; our(@EXPORT, @EXPORT_OK, %EXPORT_TAGS); our ( $s_name, @s_aliases, $s_port, $s_proto ); BEGIN { use Exporter (); @EXPORT = qw(getservbyname getservbyport getservent getserv); @EXPORT_OK = qw( $s_name @s_aliases $s_port $s_proto ); %EXPORT_TAGS = ( FIELDS => [ @EXPORT_OK, @EXPORT ] ); } # Class::Struct forbids use of @ISA sub import { goto &Exporter::import } use Class::Struct qw(struct); struct 'Net::servent' => [ name => '$', aliases => '@', port => '$', proto => '$', ]; sub populate (@) { return unless @_; my $sob = new(); $s_name = $sob->[0] = $_[0]; @s_aliases = @{ $sob->[1] } = split ' ', $_[1]; $s_port = $sob->[2] = $_[2]; $s_proto = $sob->[3] = $_[3]; return $sob; } sub getservent ( ) { populate(CORE::getservent()) } sub getservbyname ($;$) { populate(CORE::getservbyname(shift,shift||'tcp')) } sub getservbyport ($;$) { populate(CORE::getservbyport(shift,shift||'tcp')) } sub getserv ($;$) { no strict 'refs'; return &{'getservby' . ($_[0]=~/^\d+$/ ? 'port' : 'name')}(@_); } 1; __END__ =head1 NAME Net::servent - by-name interface to Perl's built-in getserv*() functions =head1 SYNOPSIS use Net::servent; $s = getservbyname(shift || 'ftp') || die "no service"; printf "port for %s is %s, aliases are %s\n", $s->name, $s->port, "@{$s->aliases}"; use Net::servent qw(:FIELDS); getservbyname(shift || 'ftp') || die "no service"; print "port for $s_name is $s_port, aliases are @s_aliases\n"; =head1 DESCRIPTION This module's default exports override the core getservent(), getservbyname(), and getnetbyport() functions, replacing them with versions that return "Net::servent" objects. They take default second arguments of "tcp". This object has methods that return the similarly named structure field name from the C's servent structure from F<netdb.h>; namely name, aliases, port, and proto. The aliases method returns an array reference, the rest scalars. You may also import all the structure fields directly into your namespace as regular variables using the :FIELDS import tag. (Note that this still overrides your core functions.) Access these fields as variables named with a preceding C<s_>. Thus, C<$serv_obj-E<gt>name()> corresponds to $s_name if you import the fields. Array references are available as regular array variables, so for example C<@{ $serv_obj-E<gt>aliases()}> would be simply @s_aliases. The getserv() function is a simple front-end that forwards a numeric argument to getservbyport(), and the rest to getservbyname(). To access this functionality without the core overrides, pass the C<use> an empty import list, and then access function functions with their full qualified names. On the other hand, the built-ins are still available via the C<CORE::> pseudo-package. =head1 EXAMPLES use Net::servent qw(:FIELDS); while (@ARGV) { my ($service, $proto) = ((split m!/!, shift), 'tcp'); my $valet = getserv($service, $proto); unless ($valet) { warn "$0: No service: $service/$proto\n" next; } printf "service $service/$proto is port %d\n", $valet->port; print "alias are @s_aliases\n" if @s_aliases; } =head1 NOTE While this class is currently implemented using the Class::Struct module to build a struct-like class, you shouldn't rely upon this. =head1 AUTHOR Tom Christiansen