From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S267589AbUBSX4I (ORCPT ); Thu, 19 Feb 2004 18:56:08 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S267591AbUBSX4I (ORCPT ); Thu, 19 Feb 2004 18:56:08 -0500 Received: from mail.kroah.org ([65.200.24.183]:46477 "EHLO perch.kroah.org") by vger.kernel.org with ESMTP id S267589AbUBSX4C (ORCPT ); Thu, 19 Feb 2004 18:56:02 -0500 Date: Thu, 19 Feb 2004 15:56:02 -0800 From: Greg KH To: =?iso-8859-1?B?RnLpZOlyaWMgTC4gVy4=?= Meunier <1@pervalidus.net> Cc: linux-kernel@vger.kernel.org, linux-hotplug-devel@lists.sourceforge.net Subject: Re: HOWTO use udev to manage /dev Message-ID: <20040219235602.GI15848@kroah.com> References: <20040219185932.GA10527@kroah.com> <20040219191636.GC10527@kroah.com> <20040219230749.GA15848@kroah.com> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: User-Agent: Mutt/1.4.1i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Feb 19, 2004 at 08:46:42PM -0300, Frédéric L. W. Meunier wrote: > On Thu, 19 Feb 2004, Greg KH wrote: > > > On Thu, Feb 19, 2004 at 07:22:30PM -0300, Frédéric L. W. Meunier wrote: > > > On Thu, 19 Feb 2004, Greg KH wrote: > > > > > > > - modify the rc.sysinit script to call the start_udev script as one of > > > > the first things that it does, but after /proc and /sys are mounted. > > > > I did this with the latest Fedora startup scripts with the patch at > > > > the end of this file. > > > > > > > > - make sure the /etc/udev/udev.conf file lists the udev_root as /dev. > > > > It should contain the following line in order to work properly. > > > > udev_root="/dev/" > > > > > > > > - reboot into a 2.6 kernel and watch udev create all of the initial > > > > device nodes in /dev > > > > > > > > > > > > If anyone has any problems with this, please let me, and the > > > > linux-hotplug-devel@lists.sourceforge.net mailing list know. > > > > > > Unless I'm missing something, it doesn't seem to work if you > > > don't have /dev/null before it gets mounted. > > > > Did you build udev using glibc or klibc? I used klibc and it worked > > just fine, as udev and udevd does not need /dev/null to work, unlike > > programs built against glibc. > > I used your instructions, so klibc. > > # ldd /sbin/udev* > > /sbin/udev: > not a dynamic executable > /sbin/udevd: > not a dynamic executable > /sbin/udevinfo: > not a dynamic executable > /sbin/udevsend: > not a dynamic executable > /sbin/udevtest: > not a dynamic executable > > It doesn't complain if I mount in /udev after I boot with > devfs, probably because it can find /dev/null etc. But I want > to boot with devfs=nomount and use it in /dev. I agree, that would be the best. So if you take out the line about starting udevd, does it work for you? How about changing the #!/bin/bash to #!/bin/sash in the first line for the start_udev script? What distro is this? Can you run strace on the start_udev script after boot to see who is needing access to /dev/null? Oh, and if you create the /dev/null node as the first thing in the start_udev script does that work? thanks, greg k-h