Date: Sun, 05 Aug 2001 09:06:01 -0700 From: Dima Dorfman <dima@unixfreak.org> To: Brian Somers <brian@Awfulhak.org> Cc: arch@FreeBSD.ORG, brian@freebsd-services.com Subject: Re: Library routine to load a kld if it already isn't Message-ID: <20010805160606.C985F3E35@bazooka.unixfreak.org> In-Reply-To: <200108051412.f75ECwu42771@hak.lan.Awfulhak.org>; from brian@Awfulhak.org on "Sun, 05 Aug 2001 15:12:58 %2B0100"
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Brian Somers <brian@Awfulhak.org> writes:
> > Programs that control a certain driver or set of drivers (e.g.,
> > ifconfig, ccdconfig, mdconfig) attempt to load the module they'll be
> > working with if it isn't already present. They do it in different
> > ways, and the most correct way (i.e., the one that handles the most
> > cases properly) is liable to change if the kld subsystem ever changes.
> > I propose to add a library routine, kldmaybeload(3), that will check
> > if a certain module is present in the kernel, and load it if it isn't.
> > This will cut down on duplicated code, and may save some headaches
> > later if the kld interface changes.
> >
> > Sharball of the implementation and man page is attached (extract into
> > src/lib/libc/gen). Comments? Suggestions?
>
> This is normally done with:
>
> if (modfind("module") == -1 && ID0kldload("module") == -1)
> errx();
>
> I don't think it's a good idea to change this.
Only it's wrong in some cases. Some modules will have a bus attached
to their name, such as "pci/if_fxp", and modfind() won't find them
unless you give the full name. If it were just the simpler cases as
above, I probably wouldn't propose this; it's them more complex cases
where this would help.
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