Date: Wed, 09 Sep 1998 12:33:57 -0700 From: Mike Smith <mike@smith.net.au> To: Andrzej Bialecki <abial@nask.pl> Cc: Poul-Henning Kamp <phk@critter.freebsd.dk>, freebsd-current@FreeBSD.ORG Subject: Re: Adding sysctl, part II Message-ID: <199809091933.MAA00801@dingo.cdrom.com> In-Reply-To: Your message of "Wed, 09 Sep 1998 14:54:22 %2B0200." <Pine.BSF.4.02A.9809091411140.21222-100000@korin.warman.org.pl>
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> On Wed, 9 Sep 1998, Poul-Henning Kamp wrote:
>
> >
> > >Well, I kind of figured out I probably need to use SYSCTL_PROC, and
> > >applied the following patch to machdep.c:
> >
> > Look at the
> > DDB_SHOW_COMMAND(msgbuf, db_show_msgbuf)
> > {
> >
> > at the bottom of kern/subr_prf.c
>
> Ah! I see it now - I should be glad it didn't explode in my face...
>
> It's still unclear to me, however, what should I do to retrieve not only
> the struct msgbuf (which the msgbufp points to), but the buffer itself as
> well. If I understand this correctly, once I retrieved the struct msgbuf
> contents, the msgbufp->msg_ptr is useless because it points to the data in
> kernel space, so I need to make another call to retrieve the buffer
> contents, right? The code in subr_prf.c can do this because it works in
> kernel space all the time, but I can't...
Try something like
static int
sysctl_msgbuf SYSCTL_HANDLER_ARGS
{
return(sysctl_out(req, msgbufp, MSGBUFLEN));
}
SYSCTL_PROC(_kern, OID_AUTO, msgbuf, CTLFLAG_RD, NULL, NULL,
sysctl_msgbuf, "S,msgbuf", "kernel message buffer");
--
\\ Sometimes you're ahead, \\ Mike Smith
\\ sometimes you're behind. \\ mike@smith.net.au
\\ The race is long, and in the \\ msmith@freebsd.org
\\ end it's only with yourself. \\ msmith@cdrom.com
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