Hello, Last night I sent out an announcement about some POSIX work that I have been doing. In any case, one of the FFI wrappers is driving me crazy, i.e. the one for mq_receive: http://opengroup.org/onlinepubs/007908799/xsh/mq_receive.html . When I call this function (mqReceive), I get "message too long". In my test cases I am sending and receiving messages that are only 11 bytes! The wrapper seems really straightforward. Perhaps I am looking right at the problem and don't see. I need other eyes on the wrapper to help me ;^). Please see below. Regards, V. ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- -- mqReceive is still being debugged!!!!!!!!!! -- | Retrieve a message from mqueue designated by "mqd" -- mqReceive :: Fd -> ByteCount -> Maybe Int -> IO (String, Int) mqReceive (Fd mqd) len (Just prio) = do allocaBytes (fromIntegral len) $ \ p_buffer -> do with (fromIntegral prio) $ \ p_prio -> do rc <- throwErrnoIfMinus1 "mqReceive" (c_mq_receive mqd p_buffer (fromIntegral len) p_prio) case fromIntegral rc of 0 -> ioError (IOError Nothing EOF "mqReceive" "EOF" Nothing) n -> do s <- peekCStringLen (p_buffer, fromIntegral n) return (s, n) mqReceive (Fd mqd) len Nothing = do allocaBytes (fromIntegral len) $ \ p_buffer -> do rc <- throwErrnoIfMinus1 "mqReceive" (c_mq_receive mqd p_buffer (fromIntegral len) nullPtr) case fromIntegral rc of 0 -> ioError (IOError Nothing EOF "mqReceive" "EOF" Nothing) n -> do s <- peekCStringLen (p_buffer, fromIntegral n) return (s, n) foreign import ccall unsafe "mqueue.h mq_receive" c_mq_receive :: CInt -> Ptr CChar -> CSize -> Ptr CInt -> IO CInt