Extending the ddb command set

[Kostik Belousov]

On Sun, Aug 17, 2008 at 05:17:54PM +0000, Guillaume Ballet wrote:
> On Sat, Aug 16, 2008 at 5:15 PM, Sam Leffler <sam at freebsd.org> wrote:
> >
> > Guillaume Ballet wrote:
> >>
> >> Hello hackers,
> >>
> >> I am currently working on a small project and would like to add a few
> >> commands to the set that is available in ddb.
> >>
> >> I found that very interesting albeit succinct presentation:
> >> http://people.freebsd.org/~jhb/papers/bsdcan/2008/slides.odp<http://people.freebsd.org/%7Ejhb/papers/bsdcan/2008/slides.odp>
> >>
> >> where the author hints that I should use DB_COMMAND, which I did. Yet when
> >> invoking ddb, the command does not appear in the help list. I have taken a
> >> look at the source code and was expecting set_db_cmd_set to appear in my
> >> module's section list when calling objdump -h
> >>
> >> Is DB_COMMAND only working within the kernel itself, and not modules?
> >>
> >>
> >
> > That is correct; you can't add ddb cmds from modules.  It should be doable; just hasn't been done yet.
> >
> >   Sam
> >
> 
> It is indeed doable: Here are the diffs for a first attempt at doing
> this. I am not entirely satisfied with it, though, as it does not work
> with DB_SHOW_COMMAND and the likes... Also, I have to declare a lot of
> ddb-related stuff into kern_linker.c and I don't like it. I am
> currently working at improving the whole thing, but in the mean time
> if someone wants to give it a try, comments/rants would be greatly
> appreciated.

What about module unloading ?
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