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import GHC.IO
import GHC.IO.Handle
import GHC.IO.Handle.Types
import System.IO
import Control.Concurrent.MVar
import Data.Typeable
import qualified GHC.IO.FD as FD
main = do
h <- openFile "tmp" WriteMode
hDuplicateTo h stdout
fdh <- getfd h
fdstdout <- getfd stdout
hPutStrLn stderr ("h: " ++ show (fdh /= fdstdout) ++ "\nstdout: " ++ show fdstdout)
hClose h
putStrLn "bla"
getfd h@(FileHandle _ mvar) = do
withMVar mvar $ \h__@Handle__{haDevice=dev} ->
case cast dev of
Just fd -> return (FD.fdFD fd)
Nothing -> error "getfd"
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