import Control.Exception
import System.IO.Error
import System.Process

main :: IO ()
main = do
    res <- handle (return . Left . isDoesNotExistError) $ do
        (_, _, _, ph) <- createProcess (proc "definitelydoesnotexist" [])
            { close_fds = True
            }
        fmap Right $ waitForProcess ph
    case res of
        Left True -> return ()
        _ -> error $ show res