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root |
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package Net::protoent; |
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use strict; |
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use 5.006_001; |
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our $VERSION = '1.00'; |
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our(@EXPORT, @EXPORT_OK, %EXPORT_TAGS); |
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BEGIN { |
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use Exporter (); |
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@EXPORT = qw(getprotobyname getprotobynumber getprotoent getproto); |
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@EXPORT_OK = qw( $p_name @p_aliases $p_proto ); |
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%EXPORT_TAGS = ( FIELDS => [ @EXPORT_OK, @EXPORT ] ); |
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} |
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use vars @EXPORT_OK; |
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# Class::Struct forbids use of @ISA |
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sub import { goto &Exporter::import } |
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use Class::Struct qw(struct); |
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struct 'Net::protoent' => [ |
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name => '$', |
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aliases => '@', |
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proto => '$', |
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]; |
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sub populate (@) { |
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return unless @_; |
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my $pob = new(); |
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$p_name = $pob->[0] = $_[0]; |
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@p_aliases = @{ $pob->[1] } = split ' ', $_[1]; |
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$p_proto = $pob->[2] = $_[2]; |
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return $pob; |
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} |
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sub getprotoent ( ) { populate(CORE::getprotoent()) } |
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sub getprotobyname ($) { populate(CORE::getprotobyname(shift)) } |
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sub getprotobynumber ($) { populate(CORE::getprotobynumber(shift)) } |
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sub getproto ($;$) { |
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no strict 'refs'; |
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return &{'getprotoby' . ($_[0]=~/^\d+$/ ? 'number' : 'name')}(@_); |
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} |
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1; |
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__END__ |
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=head1 NAME |
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Net::protoent - by-name interface to Perl's built-in getproto*() functions |
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=head1 SYNOPSIS |
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use Net::protoent; |
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$p = getprotobyname(shift || 'tcp') || die "no proto"; |
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printf "proto for %s is %d, aliases are %s\n", |
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$p->name, $p->proto, "@{$p->aliases}"; |
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use Net::protoent qw(:FIELDS); |
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getprotobyname(shift || 'tcp') || die "no proto"; |
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print "proto for $p_name is $p_proto, aliases are @p_aliases\n"; |
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=head1 DESCRIPTION |
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This module's default exports override the core getprotoent(), |
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getprotobyname(), and getnetbyport() functions, replacing them with |
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versions that return "Net::protoent" objects. They take default |
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second arguments of "tcp". This object has methods that return the |
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similarly named structure field name from the C's protoent structure |
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from F<netdb.h>; namely name, aliases, and proto. The aliases method |
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returns an array reference, the rest scalars. |
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You may also import all the structure fields directly into your namespace |
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as regular variables using the :FIELDS import tag. (Note that this still |
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overrides your core functions.) Access these fields as variables named |
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with a preceding C<p_>. Thus, C<$proto_obj-E<gt>name()> corresponds to |
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$p_name if you import the fields. Array references are available as |
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regular array variables, so for example C<@{ $proto_obj-E<gt>aliases() |
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}> would be simply @p_aliases. |
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The getproto() function is a simple front-end that forwards a numeric |
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argument to getprotobyport(), and the rest to getprotobyname(). |
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To access this functionality without the core overrides, |
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pass the C<use> an empty import list, and then access |
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function functions with their full qualified names. |
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On the other hand, the built-ins are still available |
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via the C<CORE::> pseudo-package. |
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=head1 NOTE |
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While this class is currently implemented using the Class::Struct |
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module to build a struct-like class, you shouldn't rely upon this. |
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=head1 AUTHOR |
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Tom Christiansen |
