[Haskell-cafe] How can I pass IOUArrays to FFI functions?

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