> how can I give back a pair of values (in my case both are
> int's) from C to OCaml?
>
> Didn't found something in the docs so far.
Hi,
Recently I've written a small tutorial about wrapping ocaml to C,
maybe you could find it usefull:
http://www.linux-nantes.org/~fmonnier/OCaml/ocaml-wrapping-c.php

and if someone wish to contribute to this document (correct the english or 
enhance it) it's wellcome.

With regards