[lwip-devel] [task #6930] Implement SO_LINGER

[Simon Goldschmidt]

Follow-up Comment #14, task #6930 (project lwip):

> The problem isn't it more the call (in do_delconn) to
> tcp_abort "too early" ?

I think you might be right. As Jonathan posted in that bug,
http://www.opengroup.org/onlinepubs/009695399/functions/setsockopt.html 
says: "the system handles the call in a way that allows the calling thread to
continue as quickly as possible". But it has to send the data! On the other
hand, netconn_delete is called if you really want to free the netconn.

Maybe it's better to call netconn_close and there we should try again if
tcp_close fails. After that, we can safely call netconn_delete without
fearing that it aborts the connection, since it's already closed.

Otherwise, we implement the same problem twice. Maybe netconn_delete should
first call netconn_close so we can leave away the state tests in
netconn_delete that are already implemented in netconn_close.

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