[Haskell-cafe] Re: What does the withProcessHandle_ function do?

[Simon Marlow]

John Ky wrote:
> I want to learn how to use FFI with Win32, so I'm looking through the 
> GHC source code.  I encountered the function
> 
> terminateProcess :: ProcessHandle -> IO ()
> terminateProcess ph = do
>   withProcessHandle_ ph $ \p_ ->
>     case p_ of
>       ClosedHandle _ -> return p_
>       OpenHandle h -> do
>     throwErrnoIfMinus1_ "terminateProcess" $ c_terminateProcess h
>     return p_
> 
> which uses withProcessHandle_.  What does it do?

withProcessHandle_ is defined in System.Process.Internals.

   http://darcs.haskell.org/packages/base/System/Process/Internals.hs

Cheers,
	Simon