On a tcp server socket, I want to use a timeout to log out clients that have become inactive after 5 mins, so after reading this:

(from IO::Socket pod)

timeout([VAL])
           Set or get the timeout value associated with this socket. I
+f called
           without any arguments then the current setting is returned.
+ If
           called with an argument the current setting is changed and 
+the pre-
           vious value returned.
[download]

I wrote a socket which opens like this:

use IO::Socket;
use IO::Select;

$max_msglen = 1024;
$max_clients = 10;
$port = 9999;
$timeout = 300;

$serverSocket = IO::Socket::INET->new(     Proto=>"tcp", 
                                        LocalPort=>$port, 
                                        Listen=>$max_clients,
                                        Timeout =>$timeout, 
                                        Reuse=>1
                                        );
$sel = IO::Select->new($serverSocket);
[download]

but it doesn't time out the clients. Looking for answers I went here:

(from IO::Select pod)

 select ( READ, WRITE, ERROR [, TIMEOUT ] )
           "select" is a static method, that is you call it with the p
+ackage
           name like "new". "READ", "WRITE" and "ERROR" are either "un
+def" or
           "IO::Select" objects. "TIMEOUT" is optional and has the sam
+e effect
           as for the core select call.
[download]

So now I'm really confused -

Firstly: What is the socket timeout I've set up actually doing?

Secondly: is the "core select" mentioned the same as the one I've tried to call on the socket at startup time?

Thirdly: Should I be checking for return values to catch the timeout event, if so where?

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