RE: [lwip-users] socket: LWIP_ACCEPT problem?

[Bill Auerbach]

I wrote that because for me the client (Win32) wouldn’t reopen the port if I clicked Close and then Open in my program.  Setting SO_LINGER resolved this.  You didn’t mention your client, so I guessed (wrong).

 

How to fix from lwIP?  Nothing you’ve written indicates it is lwIP, especially if a 3^rd party client works.

 

Bill

 

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From: address@hidden [mailto:address@hidden On Behalf Of Piero 74
Sent: Wednesday, March 05, 2008 10:47 AM
To: Mailing list for lwIP users
Subject: Re: [lwip-users] socket: LWIP_ACCEPT problem?

 

Now i'm using a simple client which i wrote....
By my board will work with a third part client, so, i cannot know if this pc application will set SO_LINGER.

So, how i can fix the problem from lwip code???

thanks,
Piero

2008/3/5, Bill Auerbach <address@hidden>:

Change the client's SO_LINGER option so it doesn't hang on to the connection.

 

Bill

 

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From: lwip-users-bounces+bauerbach=address@hidden [mailto:address@hidden] On Behalf Of Piero 74
Sent: Wednesday, March 05, 2008 10:14 AM
To: Mailing list for lwIP users
Subject: [lwip-users] socket: LWIP_ACCEPT problem?

 

Hi all.

I'm testing socket on lwip 130rc1

this is a piece of my code:

  // Create a new tcp connection handle
  //----------------------------------------------------------
  sockfd = socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
  serv_addr.sin_family = AF_INET;
  serv_addr.sin_addr.s_addr = INADDR_ANY;
  serv_addr.sin_port = htons(20000);
  bind(sockfd, (struct sockaddr *) &serv_addr, sizeof(serv_addr));
  //    setsockopt(sockfd, SOL_SOCKET, SO_KEEPALIVE, (char*)&bOptVal, bOptLen);
  listen(sockfd, 0);
  //----------------------------------------------------------

  // Loop forever
  while(1)
  {
    // Wait for connection.
    //------------------------------------------------------   
    newsockfd = accept(sockfd, &addr, &addrlen);
    bOptVal = TRUE;
    //------------------------------------------------------  
    for (i=0; i<10; i++)
    {
      // send 10 hello world!
      lwip_write(newsockfd, provatx, 12);
    }       
   
    // close connection
    close(newsockfd);
  }

I have a simple client on pc running windows.

If the client fixs his local port, accept function accept connection only the first time, after seems it doesn't accept.

If my client changes its local port for EVERY attempt, accept works weel!!!

What is the problem???

bye,
Piero

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