I have a C function of type

   void f ( HsWord32* p0, HsWord32* p1, HsWord32 size );

 

along with the FFI declaration:

   foreign import ccall unsafe f :: Ptr Word32 -> Ptr Word32 -> Word32 -> IO ()

 

In my Haskell code I have an unboxed IO array of Word32; IOUArray Int Word32.

I want to pass the pointer to this array to f().  How can I get the pointer out of the array?  Or, is there a better way to declare f() to do this?

 

I'm open to using GHC hackery; using v6.6.1 right now.

 

  -- ryan