[En-Nut-Discussion] NutTcpConnect and NutTcpCloseSocket problem

[CAMBON, Olivier]

Hi,
thanks for all your answer.
I will check the stack soon.
Could you explain how to activate DEBUG ?
I use Nut/OS 4.10.1
Here is my code :

uint8_t test connection(char* ip, uint16_t port)
{
  uint32_t rip = 0;
  u_long sock_opt = 0;
  TCPSOCKET *sock = NULL;

  /* Check the entries */
  if(ip == NULL)  { return 1; }

  /* Get the inet for the IP */
  rip = inet_addr(ip);
  /* Check the inet we got */
  if(rip == 0) { return  2; }

  /* Create socket for the connection to the IP */
  sock = NutTcpCreateSocket();
  if(sock == NULL) { return 3; }
  /* Set send timeout */
  sock_opt = 10000;
  NutTcpSetSockOpt(sock, SO_SNDTIMEO, &sock_opt, sizeof(sock_opt));
  /* Set receive timeout */
  sock_opt = 30000;
  NutTcpSetSockOpt(sock, SO_RCVTIMEO, &sock_opt, sizeof(sock_opt));

  /* Connect the server of the IP */
  if(NutTcpConnect(sock, rip, port) != 0) {  NutTcpCloseSocket(sock); return 4; }

  /* Connection OK */
  NutTcpCloseSocket(sock);
  return 0;
}

Best regards,
Olivier.


-----Original Message-----
From: en-nut-discussion-bounces at egnite.de [mailto:en-nut-discussion-bounces at egnite.de] On Behalf Of DreamCat
Sent: Thursday, August 09, 2012 6:16 AM
To: Ethernut User Chat (English)
Subject: Re: [En-Nut-Discussion] NutTcpConnect and NutTcpCloseSocket problem

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
>
> --
>
> Thermotemp GmbH, Embedded-IT
>
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