IO::Socketprovides an object interface to creating and using sockets. It is built upon the Handle interface and inherits all the methods defined by Handle.
IO::Socket only defines methods for those operations which are common to all types of
socket. Operations which are specified to a socket in a particular domain
have methods defined in sub classes of
IO::Socket will export all functions (and constants) defined by the Socket manpage.
IO::Socket, which is a reference to a newly created symbol (see the
newoptionally takes arguments, these arguments are in key-value pairs.
newonly looks for one key
Domainwhich tells new which domain the socket it will be. All other arguments will be passed to the configuration method of the package for that domain, See below.
IO::Seekablemethods, which are just front ends for the corresponding built-in functions:
socket socketpair bind listen accept send recv peername (getpeername) sockname (getsockname)
Some methods take slightly different arguments to those defined in the perlfunc manpage in attempt to make the interface more flexible. These are
PKGis specified. This object can be used to communicate with the client that was trying to connect. In a scalar context the new socket is returned, or undef upon failure. In an array context a two-element array is returned containing the new socket and the peer address, the list will be empty upon failure.
Additional methods that are provided are
&AF_INETwill be returned.
&SOCK_STREAMwill be returned.
IO::Socket::INETprovides a constructor to create an AF_INET domain socket and some related methods. The constructor can take the following options
PeerAddr Remote host address <hostname>[:<port>] PeerPort Remote port or service <service>[(<no>)] | <no> LocalAddr Local host bind address hostname[:port] LocalPort Local host bind port <service>[(<no>)] | <no> Proto Protocol name "tcp" | "udp" | ... Type Socket type SOCK_STREAM | SOCK_DGRAM | ... Listen Queue size for listen Reuse Set SO_REUSEADDR before binding Timeout Timeout value for various operations
Listen is defined then a listen socket is created, else if the socket type, which is derived from the protocol, is
connect is called.
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
by preceding it with a ``:''.
Only one of
Proto needs to be specified, one will be assumed from the other. If you specify a
PeerPort port, then the constructor will try to derive
Proto from the service name.
$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');
IO::Socket::UNIXprovides a constructor to create an AF_UNIX domain socket and some related methods. The constructor can take the following options
Type Type of socket (eg SOCK_STREAM or SOCK_DGRAM) Local Path to local fifo Peer Path to peer fifo Listen Create a listen socket