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

[Simon Goldschmidt]

Follow-up Comment #5, task #10088 (project lwip):

> close() should also send a RST if there are any data already 
> received but not yet delivered to the application

Does shutdown(SHUT_RDWR) also do that?

> To do this we need to make additions to the sockets and netconn 
> layers to allow access to "how much data is buffered on receive 
> for this connection" at each layer, so we can decide what the 
> appropriate behaviour is.

We already have that information: the application tells TCP about that by
calling tcp_recved(). Isn't it enought to check the receive window? If it has
the initial size, no more data should be buffered at higher levels.

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