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

[John Ky]

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?

Thanks

-John
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