IO::Socket::INET(3)              Perl Programmers Reference Guide             IO::Socket::INET(3)



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

SYNOPSIS
           use IO::Socket::INET;

DESCRIPTION
       "IO::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.

CONSTRUCTOR
       new ( [ARGS] )
           Creates an "IO::Socket::INET" object, which is a reference to a newly created symbol
           (see the "Symbol" package). "new" optionally takes arguments, these arguments are in
           key-value pairs.

           In addition to the key-value pairs accepted by IO::Socket, "IO::Socket::INET" pro-
           vides.

               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 addresses for multi-homed hosts
               Blocking    Determine if connection will be blocking mode

           If "Listen" 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 "MultiHomed" on a socket which is in non-block-
           ing 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 "PeerAddr" can be a hostname or the IP-address on the "xx.xx.xx.xx" form.  The
           "PeerPort" can be a number or a symbolic service name.  The service name might be fol-
           lowed by a number in parenthesis which is used if the service is not known by the sys-
           tem.  The "PeerPort" specification can also be embedded in the "PeerAddr" by preceding
           it with a ":".

           If "Proto" is not given and you specify a symbolic "PeerPort" port, then the construc-
           tor will try to derive "Proto" from the service name.  As a last resort "Proto" "tcp"
           is assumed.  The "Type" parameter will be deduced from "Proto" if not specified.

           If the constructor is only passed a single argument, it is assumed to be a "PeerAddr"
           specification.

           If "Blocking" is set to 0, the connection will be in nonblocking mode.  If not speci-
           fied it defaults to 1 (blocking mode).

           Examples:

              $sock = IO::Socket::INET->new(PeerAddr => 'www.perl.org',
                                            PeerPort => 'http(80)',
                                            Proto    => 'tcp');

              $sock = IO::Socket::INET->new(PeerAddr => 'localhost:smtp(25)');

              $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";

            NOTE NOTE NOTE NOTE NOTE NOTE NOTE NOTE NOTE NOTE NOTE NOTE

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

            NOTE NOTE NOTE NOTE NOTE NOTE NOTE NOTE NOTE NOTE NOTE NOTE

       METHODS


       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

SEE ALSO
       Socket, IO::Socket

AUTHOR
       Graham Barr. Currently maintained by the Perl Porters.  Please report all bugs to
       <>.

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



perl v5.8.8                                 2001-09-21                        IO::Socket::INET(3)