From owner-freebsd-current Wed May 12 1:38:50 1999 Delivered-To: freebsd-current@freebsd.org Received: from phk.freebsd.dk (phk.freebsd.dk [212.242.40.153]) by hub.freebsd.org (Postfix) with ESMTP id B5DD3152D8 for ; Wed, 12 May 1999 01:38:46 -0700 (PDT) (envelope-from phk@critter.freebsd.dk) Received: from critter.freebsd.dk (critter.freebsd.dk [212.242.40.131]) by phk.freebsd.dk (8.9.1/8.8.8) with ESMTP id KAA23942; Wed, 12 May 1999 10:38:45 +0200 (CEST) (envelope-from phk@critter.freebsd.dk) Received: from critter.freebsd.dk (localhost [127.0.0.1]) by critter.freebsd.dk (8.9.2/8.9.2) with ESMTP id KAA03918; Wed, 12 May 1999 10:38:42 +0200 (CEST) (envelope-from phk@critter.freebsd.dk) To: Robert Garrett Cc: current@FreeBSD.ORG Subject: Re: simple (but important) task for junior kernel hacker In-reply-to: Your message of "Wed, 12 May 1999 03:33:44 -0000." <19990512033344.E21016@phc.igs.net> Date: Wed, 12 May 1999 10:38:41 +0200 Message-ID: <3916.926498321@critter.freebsd.dk> From: Poul-Henning Kamp Sender: owner-freebsd-current@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG In message <19990512033344.E21016@phc.igs.net>, Robert Garrett writes: >On Wed, 12 May 1999 at 10:04:09 +0200, Poul-Henning Kamp wrote: >> >> I don't have time just now to attend this particular detail, which >> manifests itself by swapinfo/pstat -p showing "/dev/(null)" for >> device name. >> >> The problem in short is that libkvm:kvm_getswapinfo.c has it's >> fingers in the kernels memory and pulls out a dev_t without knowing >> how to (and it shouldn't be taught this!) convert it to a udev_t. >> >> The Right Way to solve this problem is to rewrite libkvm:kvm_getswapinfo.c >> to pick up the information using some (for this purpose constructed) >> sysctl variables (sysctlbyname(3) please!), and let the kernel convert >> the dev_t to udev_t before passing it out to userland. >> >> So for any aspiring kernel hackers out there: have at it. Patches >> accepted. >> >> In general libkvm should not grovel around in a running kernel but >> only use sysctlbyname(3). >> >> -- >the only place in the entire libkvm where a dev_t is used is >kvm_proc.c line 230 this particular section completely looses me There is a dev_t passed out to pstat -s in a datastructure. -- Poul-Henning Kamp FreeBSD coreteam member phk@FreeBSD.ORG "Real hackers run -current on their laptop." FreeBSD -- It will take a long time before progress goes too far! To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message