Eager IO function

[Simon Marlow]

> > How should I modify the function below so that characters=20
> are printed
> > out as they arrive?
> >=20
> > printchar :: Handle -> IO ()
> > printchar handle =3D do   c <- hGetChar handle
> >                         putChar c
>=20
> Try using
>     hSetBuffering handle NoBuffering
>     hSetBuffering stdout NoBuffering
> from the IO library, before you call printchar.  If the input handle
> is attached to a terminal, you may also need to adjust the terminal
> emulation into `cbreak' mode, e.g. with
>     System.system "stty cbreak"
> Don't forget to reset the terminal afterwards!

GHC does the "stty cbreak" step for you, if the handle on which you set =
the buffering mode is a terminal.  Note also that not all systems have =
an 'stty' command.

Cheers,
	Simon