On Wed, Jan 04, 2006 at 08:26:20AM -0800, Jeff Rizzo wrote:
> I'm helping someone to port carp(4) from OpenBSD
> (comments/flames/whatever on the desirability of THAT in another thread,
> please :), and we've come across some instances where we need to add
> hooks to certain events (interface up, address change, etc).  OpenBSD
> has a dohooks(9) API that is used to implement various hook-needing
> functions (their doshutdownhooks() is implemented on top of it, for

This has been discussed, see
http://mail-index.netbsd.org/tech-net/2004/09/19/0012.html and the whole
thread.

See also pfil_add_hook(9). couldn't it do what you need?

Pavel Cahyna