Re: extending callbacks?

[Andreas Dilger <adilger@clusterfs.com>]

Matthias Scheidegger <mscheid@iam.unibe.ch> writes:
> I've got the following problem: I want to register a callback in a kernel
> structure, but I need to supply an additional argument to my own code. I.e. I
> need a callback
> 
> int (*cb)(int u)
> 
> to really call
> 
> int (*real_cb)(int u, void* my_arg)
> 
> At the moment, I'm only focussing on the i386 architecture.

In general, you would pass "my_arg" in a private pointer in a data
struct somewhere.  What function is it that you are calling?  That
may already have the possibility of passing the extra data somewhere.

Cheers, Andreas
--
Andreas Dilger  \ "If a man ate a pound of pasta and a pound of antipasto,
                 \  would they cancel out, leaving him still hungry?"
http://www-mddsp.enel.ucalgary.ca/People/adilger/               -- Dogbert