AW: [lwip-users] tcp connection state from app

[Zschocke, Florian]

Marc Boucher wrote on Dienstag, 15. April 2003 22:43:

> or recv with MSG_PEEK? (not yet supported by lwIP, I know)

I would say the "unixish" method would indeed be to use MSG_PEEK. 

> You are right about exceptfds, but a SIGIO-like asynchronous
> notification mechanism is probably what we need.

The problem is that a full SIGIO implementation is useless with TCP as
Stevens states. The signal would be generated too often. What you would have
to so is generate a signal only when the connection gets closed by the other
end. 
We have implemented a SIGIO-like mechnism in lwIP which calls a callback
function when data arrives but this is only used on UDP sockets.

Florian.