Win32 process spawning, POpen and Hugs, revisited

[Simon Marlow]

> The only thing I'd like to check on that I can't tell about is whether
> passing stdin and stdout to runProcess will behave "correctly".  Some
> programs (e.g. gpg) can figure out how to get control of the tty by
> themselves (to ask for passwords in the case of gpg), but others (some
> versions of vi) will fail if their stdin and stdout 
> correspond to a tty.
> It would be nice to be able to run "user-interactive" 
> commands such as text
> editors in a safe and consistent manner.  I'm not clear from your code
> whether there will be a problem with passing stdin and stdout to
> runProcess.  If the process closes stdin, will it be closed 
> for me? If the
> process changes the buffering of stdin, will that change it for me?
> Enquiring minds want to know! :)

Good questions, none of which I have given any thought to :-)  You're
almost certainly in a better position than me to decide what reasonable
answers to these are, so would you like to propose some?

Cheers,
	Simon