[lwip-users] RE: Why the tcp_pcb haven't been free when I calltcp_close()

[geckook Xu]

When I call tcp_close(),the program will send FIN,and then the
receiver will reply FIN
But the tcp_pcb haven't been free after this operation.

What should I do now?

It is my source code below in the attach file.

> > I use the lwip raw api.
> >
> >
> > When I call tcp_close() the tcp state is ESTABLISH.
> > and tcp_close() return err=ERR_OK.
> >
> > when will the tcp_pcb be free?
>
> I don't really know the lwip raw api regarding TCP. But what I know is
> that on socket-based systems, a TCP connection is only closed from one
> side if you call close(). It remains in a closing state until the other
> side has closed the connection, too.
>
> Without looking in the code, I would say this is the same for lwip raw
> api, too. I don't know if there is a function which aborts the
> connection without waiting for the other side to close it, too.
>
> Simon

app_server.c
Description: Text document