My server application in lwip board, does close operation on socket.
My client exit for "connection closed by peer" and close its socket. I'm
using a run time enviroment to write in easy way windows test application,
so, i cannot set option in socket (i have only basic blocks: listener,
connect, read, write and close)
If i write a server with the same enviroment, and use it with client, the
problem doesn't happen (so: client can reuse the same local port)
I want to know only how lwip manage this situation and why doesn't accept
connection.... i'm trying to understand using debugger, but it's very
difficoult debug a tcp connection!
And if there is a work aorund... i'm thinking to try SO_LINGER option in my
server.... but i don't know if it's correct.
PS: i'm using lwip on embedded system.
Thanks,
Piero
2008/3/5, Bikram Chatterjee <[EMAIL PROTECTED]>:
>
> > 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???
>
>
> A TCP connection is uniquely identified by six tuple at any end point
> (src_addr, src_port, dst_addr, dst_port). You see that in your case
> none of the parameters in the tuple has changed in the second
> connection. So the stack has no way of separating packets from this
> new connection from that of the previous one.
>
> Are you sure that the second connection actually have originated from
> the client? The stack on your client m/c should have stopped it.
>
>
> Bikram
>
>
> On Wed, Mar 5, 2008 at 10:12 PM, Bill Auerbach
> <[EMAIL PROTECTED]> wrote:
> >
> >
> >
> >
> > 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 3rd party client works.
> >
> >
> >
> > Bill
> >
> >
> >
> >
> > ________________________________
>
> >
> > From: [EMAIL PROTECTED] [mailto:
> [EMAIL PROTECTED] 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 <[EMAIL PROTECTED]>:
> >
> >
> >
> > Change the client's SO_LINGER option so it doesn't hang on to the
> connection.
> >
> >
> >
> > Bill
> >
> >
> >
> >
> > ________________________________
>
> >
> > From: [EMAIL PROTECTED] [mailto:
> [EMAIL PROTECTED] 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
> >
> >
> > _______________________________________________
> > lwip-users mailing list
> > [email protected]
> > http://lists.nongnu.org/mailman/listinfo/lwip-users
> >
> >
> > _______________________________________________
> > lwip-users mailing list
> > [email protected]
> > http://lists.nongnu.org/mailman/listinfo/lwip-users
> >
>
>
> _______________________________________________
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>
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