[En-Nut-Discussion] NutTcpConnect and NutTcpCloseSocket problem

[DreamCat]

Hi,
Enable the DEBUG function with it.
You have to use "CloseSocket", otherwise this will cause your ethernut
board still work on that links, even it is dead.

2012/8/9 Ole Reinhardt <ole.reinhardt at embedded-it.de>

> Hi Oliver,
>
>
> > But, I have a problem with NutTcpConnect.
> > I use this function to test if a computer of my network is started and
> > its program is ready to listen.
> > The problem is when the computer is offline, in the following code,
> > NutTcpCloseSocket does a reset of the board :
> >
> >   if(NutTcpConnect(sock, rip, port) != 0) { NutTcpCloseSocket(sock);
> > return -1; }
>
> I would expect the problem any where else. Do you perhaps try to later
> access the socket variable after having closed the socket before?
>
> And are you sure that "sock" is valid?
>
> Do you have implemented it this way?
>
> TCPSOCKET *sock;
>
> if ((sock = NutTcpCreateSocket()) != 0) {
>     if(NutTcpConnect(sock, rip, port) != 0) {
>         NutTcpCloseSocket(sock);
>         return -1;
>     } else {
>         /* do something here */
>         NutTcpCloseSocket(sock);
>         return 0;
>     }
> } else {
>     printf("Out of memory?\n);
> }
>
> Normaly this should be working fine so I expect a buffer overflow or
> access of an invalid pointer at some place in your user code.
>
> Perhaps you could post a lager piece of code so we could see the
> context.
>
> Another problem might be the stack. Have you implemented this as a
> thread? Do you use lots of local variables or large local arrays?
>
> A stack overflow could also result in a reboot.
>
> Bye,
>
> Ole
>
> --
>
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