Commit | Line | Data |
36477c24 |
1 | package Net::protoent; |
2 | use strict; |
3 | |
4 | BEGIN { |
5 | use Exporter (); |
6 | use vars qw(@ISA @EXPORT @EXPORT_OK %EXPORT_TAGS); |
7 | @ISA = qw(Exporter); |
8 | @EXPORT = qw(getprotobyname getprotobynumber getprotoent); |
9 | @EXPORT_OK = qw( $p_name @p_aliases $p_proto ); |
10 | %EXPORT_TAGS = ( FIELDS => [ @EXPORT_OK, @EXPORT ] ); |
11 | } |
12 | use vars @EXPORT_OK; |
13 | |
14 | use Class::Template qw(struct); |
15 | struct 'Net::protoent' => [ |
16 | name => '$', |
17 | aliases => '@', |
18 | proto => '$', |
19 | ]; |
20 | |
21 | sub populate (@) { |
22 | return unless @_; |
23 | my $pob = new(); |
24 | $p_name = $pob->[0] = $_[0]; |
25 | @p_aliases = @{ $pob->[1] } = split ' ', $_[1]; |
26 | $p_proto = $pob->[2] = $_[2]; |
27 | return $pob; |
28 | } |
29 | |
30 | sub getprotoent ( ) { populate(CORE::getprotoent()) } |
31 | sub getprotobyname ($) { populate(CORE::getprotobyname(shift)) } |
32 | sub getprotobynumber ($) { populate(CORE::getprotobynumber(shift)) } |
33 | |
34 | sub getproto ($;$) { |
35 | no strict 'refs'; |
36 | return &{'getprotoby' . ($_[0]=~/^\d+$/ ? 'number' : 'name')}(@_); |
37 | } |
38 | |
39 | 1; |
40 | |
41 | __END__ |
42 | |
43 | =head1 NAME |
44 | |
45 | Net::protoent - by-name interface to Perl's built-in getproto*() functions |
46 | |
47 | =head1 SYNOPSIS |
48 | |
49 | use Net::protoent; |
50 | $p = getprotobyname(shift || 'tcp') || die "no proto"; |
51 | printf "proto for %s is %d, aliases are %s\n", |
52 | $p->name, $p->proto, "@{$p->aliases}"; |
53 | |
54 | use Net::protoent qw(:FIELDS); |
55 | getprotobyname(shift || 'tcp') || die "no proto"; |
56 | print "proto for $p_name is $p_proto, aliases are @p_aliases\n"; |
57 | |
58 | =head1 DESCRIPTION |
59 | |
60 | This module's default exports override the core getprotoent(), |
61 | getprotobyname(), and getnetbyport() functions, replacing them with |
62 | versions that return "Net::protoent" objects. They take default |
63 | second arguments of "tcp". This object has methods that return the |
64 | similarly named structure field name from the C's protoent structure |
65 | from F<netdb.h>; namely name, aliases, and proto. The aliases method |
66 | returns an array reference, the rest scalars. |
67 | |
68 | You may also import all the structure fields directly into your namespace |
69 | as regular variables using the :FIELDS import tag. (Note that this still |
70 | overrides your core functions.) Access these fields as variables named |
71 | with a preceding C<p_>. Thus, C<$proto_obj-E<gt>name()> corresponds to |
72 | $p_name if you import the fields. Array references are available as |
73 | regular array variables, so for example C<@{ $proto_obj-E<gt>aliases() |
74 | }> would be simply @p_aliases. |
75 | |
76 | The getproto() function is a simple front-end that forwards a numeric |
77 | argument to getprotobyport(), and the rest to getprotobyname(). |
78 | |
79 | To access this functionality without the core overrides, |
80 | pass the C<use> an empty import list, and then access |
81 | function functions with their full qualified names. |
82 | On the other hand, the built-ins are still available |
83 | via the C<CORE::> pseudo-package. |
84 | |
85 | =head1 NOTE |
86 | |
87 | While this class is currently implemented using the Class::Template |
88 | module to build a struct-like class, you shouldn't rely upon this. |
89 | |
90 | =head1 AUTHOR |
91 | |
92 | Tom Christiansen |