Hello,

       I am also testing my aio support. The aio_write binding seems to work ok .. as well as aio_error, Aio_return is a problem child. I think I wrote a really simple binding. I always receive nbytes as 0. I have been staring at the code hoping to catch a stupid mistake. I put putStrLn's in the code. .....Here is the code ...

aioReturn :: AIOCB -> IO (AIOCB, ByteCount)
aioReturn aiocb = do
   allocaBytes (#const sizeof(struct aiocb)) $ \ p_aiocb -> do
      poke p_aiocb aiocb
      count <- throwErrnoIfMinus1 "aioReturn" (c_aio_return p_aiocb)
      aiocb <- peek p_aiocb
      return (aiocb, fromIntegral count)

foreign import ccall safe "aio.h aio_return"
    c_aio_return :: Ptr AIOCB -> IO CInt

Maybe someone can spot something that I haven't.

Thanks, Vasili