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

[Oscar F]

Ok, sorry. The values are always the same

MEMP_NUM_NETCONN        4
errno = 0

but i saw maybe the problem
/* MEMP_NUM_TCP_PCB: the number of simultaneously active TCP connections. */
#define MEMP_NUM_TCP_PCB        2
/* MEMP_NUM_TCP_PCB_LISTEN: the number of listening TCP connections. */
#define MEMP_NUM_TCP_PCB_LISTEN 1
/* MEMP_NUM_TCP_SEG: the number of simultaneously queued TCP segments. */
#define MEMP_NUM_TCP_SEG        9
/* MEMP_NUM_SYS_TIMEOUT: the number of simulateously active timeouts. */
#define MEMP_NUM_SYS_TIMEOUT    6


#define MEMP_NUM_TCP_PCB_LISTEN 1  can be possible? i´ll test

thanks
Oscar

On Fri, Sep 18, 2009 at 11:11 AM, Kieran Mansley <address@hidden> wrote:

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



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