The IO::Socket Module
The IO::Socket module included in the core Perl distribution provides an object-oriented approach to socket programming. This module provides a convenient way to handle the large number of options you have to deal with, and it handles the laborious task of forming addresses. IO::Socket is built upon the Socket module provided in the standard library. It inherits from IO::Handle, which supports a class of filehandle objects for much of the IO library. The following IO::Socket functions are simply frontends for the corresponding built-in functions and use the same syntax:
socket socketpair bind listen send recv peername (same as getpeername) sockname (same as getsockname)
accept function in IO::Socket is slightly different from the
equivalent function, however, and is described later in the chapter.
IO:Socket contains two subclasses: INET and UNIX. The INET subclass is used to create and manipulate Internet-domain sockets, such as the ones used in the examples. The UNIX subclass creates Unix domain sockets.
IO::Socket greatly simplifies the implementation of a socket for client communications. The following example creates an Internet-domain socket (using the INET subclass) and attempts to connect to the specified server:
use IO::Socket; $sock = new IO::Socket::INET (PeerAddr => 'www.ora.com', PeerPort => 80, Proto => 'tcp'); die "$!" unless $sock;
IO::Socket::INET::new creates an object containing a socket filehandle and connects it ...