Re: [Haskell-beginners] listenOn specific IP

30 Jul 2013

      vold  writes:
...
I'm trying to write a simple server with network. listenOn takes a
socket number, but tries to bind to every available IP, which isn't what I
need. How do I tell it to bind to a specific address?
I did this eventually by writing my own copy of the listenOn function

listenOn' host (PortNumber port) = do
    proto <- getProtocolNumber "tcp"
    bracketOnError
        (socket AF_INET Stream proto)
        (sClose)
        (\sock -> do
            setSocketOption sock ReuseAddr 1
            bindSocket sock (SockAddrInet port host)
            listen sock maxListenQueue
            return sock
        )

It feels very hacky though.