[Haskell-cafe] C variable access via FFI

John Meacham john at repetae.net
Tue Apr 20 18:27:32 EDT 2010

On Tue, Apr 20, 2010 at 01:48:16AM -0500, Tom Hawkins wrote:
> I have a bunch of global variables in C I would like to directly read
> and write from Haskell.  Is this possible with FFI, or must I write a
> bunch of C wrapper functions for the interface, i.e. a 'get' and a
> 'set' for each variable?


  int my_int;


foreign import "&my_int" my_int_ptr :: Ptr Int

foo = do
        poke my_int_ptr 4
        x <- peek my_int_Ptr


John Meacham - ⑆repetae.net⑆john⑈ - http://notanumber.net/

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