Network Programming with Perl

A Nonblocking TCP Client Using IO::Poll

As a practical example of IO::Poll, Figure 16.1 shows gab7.pl, the last of the gab series of Telnet-like TCP clients. This client is similar to the multiplexed gab5.pl client discussed in Chapter 12 (Figure 12.1). It tries to make an outgoing TCP connection to the host and port indicated on the command line or, if not otherwise specified, to the echo server on the local machine. It then copies its standard input to the socket and copies everything received on the socket to standard output. Like Telnet, gab7.pl can be used to talk directly to any of the conventional text-based servers.

Figure 16.1. The gab7.pl script uses IO::Poll to multiplex input and output

To make it more interesting, gab7.pl