Re: [lwip-users] What is a PCB and why don't I have any?

[ake . forslund]

The telnet client is the client provided
by windows XP so can't provide the source code for it. The server thread
on my platform is using sockets (LWIP_COMPAT_SOCKETS) and looks like this:

void task_socket_recv(void * arg)
{
  int lSocketRecv, new_fd;
  u32_t lAddrSize;
  struct addrinfo *sListenAddr,
hints;
  char buffer[1024];
  int nbytes;
  LWIP_DEBUGF(SOCKETS_DEBUG, ("Recv
Task started!\n"));
  memset((char *)&hints, 0,
sizeof(struct addrinfo));
  hints.ai_family = AF_UNSPEC;
  hints.ai_socktype = SOCK_STREAM;
  lwip_getaddrinfo("0.0.0.0",
"23", &hints, &sListenAddr);
    
  lSocketRecv = lwip_socket(sListenAddr->ai_family,
sListenAddr->ai_socktype, sListenAddr->ai_protocol);
  
  
  lwip_bind(lSocketRecv, (struct
sockaddr *)&sListenAddr, sizeof(sListenAddr));
  
  while (1)
  {
    os_dly_wait(100);
    lwip_listen(lSocketRecv,
128);
    lAddrSize = sizeof(sListenAddr);
    new_fd = lwip_accept(lSocketRecv,
(struct sockaddr *)&sListenAddr, &lAddrSize);
    nbytes = lwip_read(new_fd,
buffer, sizeof(buffer));
    lwip_write(new_fd, "Welcome
to the jungle\n", 22);
    if (nbytes > 0)
      LWIP_DEBUGF(SOCKETS_DEBUG,
("Recv\n\r"));
  }
}

The thread stops in lwip_accept() ->
netconn_accept() where it is waiting for sys_arch_mbox_fetch(&conn->acceptmbox,
(void **)&newconn, conn->recv_timeout) to get an answer of some
sort.


/Åke

-----------------------------
Åke Forslund
0433-273296
NIBE AB
Box 14
S-285 21  Markaryd
Tel +46-(0)433-273296

From:	Kieran Mansley <address@hidden>
To:	Mailing list for lwIP users <address@hidden>
Date:	2011-06-17 10:32
Subject:	Re: [lwip-users] What is a PCB and why don't I have any?
Sent by:	address@hidden

---

On Fri, 2011-06-17 at 09:54 +0200, address@hidden
wrote:
> my question is what is a PCB in this context and where are they
> created? 
> Are they created with the socket or somewhere else?

Which API are you using in your telnet client?  Can you share the
code
with us?

Kieran


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