Socket Communication Over the Internet

Perl Tutorials - Herong's Tutorial Examples

Dr. Herong Yang, Version 5.10

Perl Tutorials - Herong's Tutorial Examples

∟Socket Communication Over the Internet

This chapter provides tutorial examples and notes on socket communication. Topics include the socket communication interface model; built-in functions for socket communication server and client; using listen() and accept() functions to play the server role; using connect() to play the client role.

What Is Socket Communication?

connect() - Establishing a Socket Communication

ReverseEchoer.pl - A Simple Socket Server Program

SocketClient.pl - A Simple Socket Client Program

gethostbyaddr() - Network Utility Functions

Socket.pm - The Socket Module

Conclusions:

A socket represents one end-point of a two-way communication link between two programs running on the Internet network.
connect() - Sends a communication request to a remote address that represents a port on the server system.
ReverseEchoer.pl is a socket communication server script example that uses listen() and accept() to take a remote client request.
SocketClient.pl is a socket communication client script example that uses connect() to make connection request to a remote server.
gethostbyaddr() returns the host name of the specified packed IP address.
Socket.pm is a Perl module that helps you to use socket related functions.

Table of Contents

About This Book

Perl on Linux Systems

ActivePerl on Windows Systems

Data Types: Values and Variables

Expressions, Operations and Simple Statements

User Defined Subroutines

Perl Built-in Debugger

Name Spaces and Perl Module Files

Symbolic (or Soft) References

Hard References - Addresses of Memory Objects

Objects (or References) and Classes (or Packages)