On Thu, Jun 27, 2013 at 12:10 PM, Mirko Vukovic <mirko.vukovic at gmail.com> wrote: > What do I have to give for c? I do have its address. Should I use mem-ref, > or convert-from-foreign, or something else? You want mem-ref. HTH, -- Luís Oliveira http://kerno.org/~luis/