Date: Wed, 04 Nov 1998 00:53:51 +0800 From: Peter Wemm <peter@netplex.com.au> To: Brian Feldman <green@zone.syracuse.net> Cc: John Hay <jhay@mikom.csir.co.za>, freebsd-current@FreeBSD.ORG Subject: Re: Booting Elf Kernel : replying to myself Message-ID: <199811031653.AAA24458@spinner.netplex.com.au> In-Reply-To: Your message of "Tue, 03 Nov 1998 09:40:40 EST." <Pine.BSF.4.05.9811030937540.27548-100000@zone.syracuse.net>
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Brian Feldman wrote:
> I am referring also that it would check to see if this file exists, and
> return a malloced answer, else return NULL. This way it would be asy to
> say something like
> char *name;
> if ((name = getkldbyname("mfs")) != NULL {
> kldload(name);
> free(name);
> } else {
> fprintf(stderr, "Could not load mfs.\n");
> exit(1);
> }
Well, it would have to parse the module path:
$ sysctl kern.module_path
kern.module_path: /;/boot/;/modules/
The kernel searches the path already, the best way to do the code above is:
if (kldload("mfs") == -1) {
fprintf(stderr, "Could not load mfs.\n");
exit(1);
}
.. but the kernel will already try this in mount(2) now. I have already
got one "What???" response about having just made mount do this, so I
guess we'll have to wait and see if this is going to stay.
> Brian Feldman
>
> On Tue, 3 Nov 1998, Brian Feldman wrote:
>
> > So should we take the VFS loading out of libc and add it to mount? Or
> > should there be a wrapper function in libc, getkldbyname (char *name) and
> > return "/modules/name.ko"?
> >
> > Brian Feldman
> >
> > On Tue, 3 Nov 1998, Peter Wemm wrote:
> >
> > > Brian Feldman wrote:
> > > > Ahhhh, that's where it is! I have no good idea on how to allow, with th
is
> > > > code, lkm's and kld's to coexist.... so is it time to completely phase
out
> > > > lkm's yet?
> > >
> > > I think the best way is to have mount(2) initiate a kldload if needed. W
e
> > > will need this functionality sooner or later. If mount(2) does it, we ca
n
> > > garbage collect unused, unmounted filesystems after a while and unload
> > > them.
> > >
> > > > Brian Feldman
> > > >
> > > > On Mon, 2 Nov 1998, John Hay wrote:
> > > >
> > > > > > Be sure to let me know when ELF kernels can autoload kld modules li
ke the
> > > > > > current a.out kernel does with lkm's.
> > > > >
> > > > > It's not the kernel that loads them. Go and look in lib/libc/gen/getv
fsent.
> > > c
> > > > >
> > > > > John
> > > > > --
> > > > > John Hay -- John.Hay@mikom.csir.co.za
Cheers,
-Peter
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