SocketConnected

Checks to see if a socket index is connected to the server. This is useful in order to free inactive clients from a server.

Note: This doesn't always work (in fact, most of the time SocketConnected() doesn't do the job), so you may want to implement some sort of "heart-beat" signal that must be received within a certain amount of time, or else the client will be disconnected.

if (!SocketConnected(i))
{
	SocketClose(i);
}