Date: Wed, 09 Sep 1998 15:42:02 +0200 From: Poul-Henning Kamp <phk@critter.freebsd.dk> To: Andrzej Bialecki <abial@nask.pl> Cc: freebsd-current@FreeBSD.ORG Subject: Re: Adding sysctl, part II Message-ID: <1492.905348522@critter.freebsd.dk> 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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In message <Pine.BSF.4.02A.9809091411140.21222-100000@korin.warman.org.pl>, And rzej Bialecki writes: >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... But you sysctl_proc does run in kernel, clone the code in from the DDB_SHOW procedure... -- Poul-Henning Kamp FreeBSD coreteam member phk@FreeBSD.ORG "Real hackers run -current on their laptop." "ttyv0" -- What UNIX calls a $20K state-of-the-art, 3D, hi-res color terminal To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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