IO::Socket::INET - Object interface for AF_INET domain sockets

    use IO::Socket::INET;

CWIO::Socket::INET provides an object interface to creating and using sockets in the AF_INET domain. It is built upon the IO::Socket interface and inherits all the methods defined by IO::Socket.

new ( [ARGS] )

Creates an CWIO::Socket::INET object, which is a reference to a newly created symbol (see the CWSymbol package). CWnew optionally takes arguments, these arguments are in key-value pairs. In addition to the key-value pairs accepted by IO::Socket, CWIO::Socket::INET provides.

    PeerAddr    Remote host address          <hostname>[:<port>]
    PeerHost    Synonym for PeerAddr
    PeerPort    Remote port or service       <service>[(<no>)] | <no>
    LocalAddr   Local host bind address      hostname[:port]
    LocalHost   Synonym for LocalAddr
    LocalPort   Local host bind port         <service>[(<no>)] | <no>
    Proto       Protocol name (or number)    "tcp" | "udp" | ...
    Type        Socket type                  SOCK_STREAM | SOCK_DGRAM | ...
    Listen      Queue size for listen
    ReuseAddr   Set SO_REUSEADDR before binding
    Reuse       Set SO_REUSEADDR before binding (deprecated, prefer ReuseAddr)
    ReusePort   Set SO_REUSEPORT before binding
    Broadcast   Set SO_BROADCAST before binding
    Timeout     Timeout value for various operations
    MultiHomed  Try all adresses for multi-homed hosts
    Blocking    Determine if connection will be blocking mode

If CWListen is defined then a listen socket is created, else if the socket type, which is derived from the protocol, is SOCK_STREAM then connect() is called. Although it is not illegal, the use of CWMultiHomed on a socket which is in non-blocking mode is of little use. This is because the first connect will never fail with a timeout as the connect call will not block. The CWPeerAddr can be a hostname or the IP-address on the xx.xx.xx.xx form. The CWPeerPort can be a number or a symbolic service name. The service name might be followed by a number in parenthesis which is used if the service is not known by the system. The CWPeerPort specification can also be embedded in the CWPeerAddr by preceding it with a :. If CWProto is not given and you specify a symbolic CWPeerPort port, then the constructor will try to derive CWProto from the service name. As a last resort CWProto tcp is assumed. The CWType parameter will be deduced from CWProto if not specified. If the constructor is only passed a single argument, it is assumed to be a CWPeerAddr specification. If CWBlocking is set to 0, the connection will be in nonblocking mode. If not specified it defaults to 1 (blocking mode). Examples:

   $sock = IO::Socket::INET->new(PeerAddr => 'www.perl.org',
                                 PeerPort => 'http(8)',
                                 Proto    => 'tcp');

   $sock = IO::Socket::INET->new(PeerAddr => 'localhost:smtp(2)');

   $sock = IO::Socket::INET->new(Listen    => 5,
                                 LocalAddr => 'localhost',
                                 LocalPort => 9000,
                                 Proto     => 'tcp');

   $sock = IO::Socket::INET->new('127.0.0.1:25');

   $sock = IO::Socket::INET->new(PeerPort  => 9999,
                                 PeerAddr  => inet_ntoa(INADDR_BROADCAST),
                                 Proto     => udp,    
                                 LocalAddr => 'localhost',
                                 Broadcast => 1 ) 
                             or die "Can't bind : $@\n";

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As of VERSION 1.18 all IO::Socket objects have autoflush turned on by default. This was not the case with earlier releases.

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sockaddr ()

Return the address part of the sockaddr structure for the socket

sockport ()

Return the port number that the socket is using on the local host

sockhost ()

Return the address part of the sockaddr structure for the socket in a text form xx.xx.xx.xx

peeraddr ()

Return the address part of the sockaddr structure for the socket on the peer host

peerport ()

Return the port number for the socket on the peer host.

peerhost ()

Return the address part of the sockaddr structure for the socket on the peer host in a text form xx.xx.xx.xx

Socket, IO::Socket

Graham Barr. Currently maintained by the Perl Porters. Please report all bugs to <perl5-porters@perl.org>.

Copyright (c) 1996-8 Graham Barr <gbarr@pobox.com>. All rights reserved. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.