Re: [lwip-users] TCP listen fucntion always return <=0

[Kieran Mansley]

On Fri, 2009-09-18 at 10:48 +0200, Oscar F wrote:
> The function with error is lwip_listen(lSocket[i],10) != 0, the first
> time return 0 but then return -1 for the next socket.

I'm asking some simple questions to help find the cause of your problem
but you keep failing to answer them.  I need to know the values of
MEMP_NUM_NETCONN and errno.  Please note that errno is not the value
returned by lwip_listen(), it is a global C variable.  

Could you for example add the following line of code after the call to
lwip_listen() fails:

printf("MEMP_NUM_NETCONN: %d, errno: %d\n", MEMP_NUM_NETCONN, errno);

and tell us what it prints out?

Your code should now look like this:

        //Listen to the 8 socket.Maximum 10 connection for socket
        if ( lwip_listen(lSocket[i],10) != 0 )
         {
           printf("MEMP_NUM_NETCONN: %d, errno: %d\n", MEMP_NUM_NETCONN, errno);
           lwip_close(lSocket[i]); //Always enter here
         }

(you may need to replace printf with whatever you platform's equivalent
function is)

Thanks

Kieran