Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Sat, 16 Mar 2002 17:04:04 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Sat, 16 Mar 2002 17:03:44 -0500 Received: from ns.suse.de ([213.95.15.193]:59406 "HELO Cantor.suse.de") by vger.kernel.org with SMTP id ; Sat, 16 Mar 2002 17:03:38 -0500 To: Alan Cox Cc: linux-kernel@vger.kernel.org Subject: Re: Nice values for kernel modules In-Reply-To:

From: Andi Kleen Date: 16 Mar 2002 23:03:36 +0100 In-Reply-To: Alan Cox's message of "16 Mar 2002 18:40:02 +0100" Message-ID: Lines: 24 X-Mailer: Gnus v5.7/Emacs 20.6 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Alan Cox writes: > > Ability to bypass the stupid commercial time-locked licences (at some time > > wordperfect demo was locked like that and my timetravel module turned a > > demo into full product -- users were happy, at least according to emails I > > received :) > > Not any more. Under the DMCA your time travel module probably makes you > a fugtive from US justice 8) > > In general though calling into the syscall table by hand is a bad move. If > the function you are calling is generically useful then its much better to > work out whether the real function should be exported. Some programs depends on tapping the system call table. For example private ice and oprofile do this for execve and other calls to know when a new process is started. It would be possible to add function pointers to all these functions, but just tapping the system call table actually looks cleaner to me. [yes, the approach has module unload races, but these modules tend to just make themselves not unloadable] -Andi - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/