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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
example).  I've done some poking around in kern_subr.c, and it looks
like we actually have almost all of the blocks that their API is built
on top of already, so I'm wondering if people think this would be a good
thing to import, or not, before I spend any time on it.  Is it
worthwhile to get a little API convergence, here?  I don't necessarily
think we should copy it exactly, but think a more general "hooks"
mechanism is warranted...

Thoughts?

+j



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