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IO::Socket::INET

Perl 5 version 20.0 documentation
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IO::Socket::INET

NAME

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

SYNOPSIS

  1. 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 provides.

    1. PeerAddr Remote host address <hostname>[:<port>]
    2. PeerHost Synonym for PeerAddr
    3. PeerPort Remote port or service <service>[(<no>)] | <no>
    4. LocalAddr Local host bind address hostname[:port]
    5. LocalHost Synonym for LocalAddr
    6. LocalPort Local host bind port <service>[(<no>)] | <no>
    7. Proto Protocol name (or number) "tcp" | "udp" | ...
    8. Type Socket type SOCK_STREAM | SOCK_DGRAM | ...
    9. Listen Queue size for listen
    10. ReuseAddr Set SO_REUSEADDR before binding
    11. Reuse Set SO_REUSEADDR before binding (deprecated,
    12. prefer ReuseAddr)
    13. ReusePort Set SO_REUSEPORT before binding
    14. Broadcast Set SO_BROADCAST before binding
    15. Timeout Timeout value for various operations
    16. MultiHomed Try all addresses for multi-homed hosts
    17. 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. If the Listen argument is given, but false, the queue size will be set to 5.

    Although it is not illegal, the use of MultiHomed 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 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 followed by a number in parenthesis which is used if the service is not known by the system. 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 constructor 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 specified it defaults to 1 (blocking mode).

    Examples:

    1. $sock = IO::Socket::INET->new(PeerAddr => 'www.perl.org',
    2. PeerPort => 'http(80)',
    3. Proto => 'tcp');
    4. $sock = IO::Socket::INET->new(PeerAddr => 'localhost:smtp(25)');
    5. $sock = IO::Socket::INET->new(Listen => 5,
    6. LocalAddr => 'localhost',
    7. LocalPort => 9000,
    8. Proto => 'tcp');
    9. $sock = IO::Socket::INET->new('127.0.0.1:25');
    10. $sock = IO::Socket::INET->new(
    11. PeerPort => 9999,
    12. PeerAddr => inet_ntoa(INADDR_BROADCAST),
    13. Proto => udp,
    14. LocalAddr => 'localhost',
    15. Broadcast => 1 )
    16. or die "Can't bind : $@\n";
    17. 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.

    1. 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 <perlbug@perl.org>.

COPYRIGHT

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.