[lwip-devel] [task #10088] Correctly implement close() vs. shutdown()

[Simon Goldschmidt]

Update of task #10088 (project lwip):

        Percent Complete:                      0% => 60%                    
             Assigned to:                    None => goldsimon              
         Planned Release:                    None => 1.4.0                  

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Follow-up Comment #12:

I've just checked in something to get us started on this:
- tcp_shutdown(WR) does the same as the previous tcp_close,
- tcp_shutdown(RD) sets a flag TF_RXCLOSED
- if the flag is set, pcb->tmr is not updated on input segments (Fixes bug
#26062)
- if the flag is set, TCP_EVENT_RECV does *not* call the application's recv
callback but instead update the window accordingly

There are 3 open points:
- Is this the correct implementation of SHUT_RD?
- The above changes still process incoming data after FIN is sent, is this
OK?
- As written in last comment, SHUT_WR may lead to closing the connection too
early.

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