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The LUA SocketLib and the Coroutines

By Jerome Guinot aka 'JeGX' - jegx_AT_ozone3d(dot)net

Initial draft: May 2, 2006

[ Index ]

Introduction | Page 2 | Page 3 | Page 4 | Page 5

�Next Page

3 - Setting up a TCP/IP server

The usual procedure to create a TCP server can directly be applied with the SocketLib functions. This schema is the following one:

  • 1 - create a server half-socket
  • 2 - attach the half-socket to a port
  • 3 - listen on this port

The SocketLib being a part of Hyperion, it can be used like any other standard library provided with LUA (io, math, string, os, etc.) simply by calling its name with the socket.tcp() extension for example. The following code shows how to create the TCP server.

function createTCPServer( host, port, backlog )
	local tcp_server, err = socket.tcp();
	if tcp_server==nil then 
		return nil, err; 

	tcp_server:setoption("reuseaddr", true);
	local res, err = tcp_server:bind(host, port);
	if res==nil then
		return nil, err;

	res, err = tcp_server:listen(backlog);
	if res==nil then 
		return nil, err;

	return tcp_server;

socket.tcp() allows to create a TCP server object. It is then possible to access the server functions by separating the server name and the function name by 2 points: tcp_server:setoption(). A detailed explanation on functions and objects provided with the SocketLib is available in the project at the end of this page.

All the functions used after the creation of the server object are really well known for this kind of job: setoption(), bind() and listen().

Most of the SocketLib functions return one parameter if successful and two parameters if not. If a failure occurs, the first returned value is nil and the second value is the error message.

The createTCPServer() function must be called once during ths initialization of the host program. This is done in Hyperion just by inserting both the code and the call to that function in an initialization LUA script (run_mode="INIT").

Last thing: pay attention to the host parameter in createTCPServer() function. If you set it with "localhost", the TCP server will accept only localhost incoming connections (i.e the client is localized on the same computer than the server). So if you wish to be able to connect to your server from a client placed physically in another computer, you have to set host as follow: host = "*";. It's a little trick but believe me, you may waste much time if you don't know it!

Creating a TCP server is the easiest part. Let us tackle the hardcore one: the acceptation and the management of the in going connections.

[ Index ]

Introduction | Page 2 | Page 3 | Page 4 | Page 5

�Next Page

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