Re: HOWTO use udev to manage /dev

[Greg KH]

On Thu, Feb 19, 2004 at 09:51:52PM -0300, Frédéric L. W. Meunier wrote:
> On Thu, 19 Feb 2004, Greg KH wrote:
> 
> > So if you take out the line about starting udevd, does it
> > work for you?
> 
> No.
> 
> > How about changing the #!/bin/bash to #!/bin/sash in the
> > first line for the start_udev script?
> 
> I didn't have it, but compiled and changed. Yes, it works.
> 
> > What distro is this?
> 
> Slackware, with a cute rc.S. /bin/bash was also recompiled, shared:
> 
> $ ldd /bin/bash
>         libreadline.so.4 => /usr/lib/libreadline.so.4 (0x4001c000)
>         libhistory.so.4 => /usr/lib/libhistory.so.4 (0x40049000)
>         libncurses.so.5 => /lib/libncurses.so.5 (0x40050000)
>         libdl.so.2 => /lib/libdl.so.2 (0x4008f000)
>         libc.so.6 => /lib/libc.so.6 (0x40092000)
>         /lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0x40000000)
> 
> Maybe the problem ? Does yours differ ?

Mine does differ, but it is dynamic:

$ ldd /bin/bash
        linux-gate.so.1 =>  (0xffffe000)
        libtermcap.so.2 => /lib/libtermcap.so.2 (0x4d5b5000)
        libdl.so.2 => /lib/libdl.so.2 (0x4d3b4000)
        libc.so.6 => /lib/tls/libc.so.6 (0x4d254000)
        /lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0x4d238000)

> bash from Slackware:
> 
>         libtermcap.so.2 => /lib/libtermcap.so.2 (0x4001c000)
>         libdl.so.2 => /lib/libdl.so.2 (0x4005c000)
>         libc.so.6 => /lib/libc.so.6 (0x4005f000)
>         /lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0x40000000)
> 
> OK, I'll later boot with it and see if it works. If it does,
> I'll run strace with the other.

How about using sash?  That is statically linked.

> > Can you run strace on the start_udev script after boot to see who is
> > needing access to /dev/null?
> 
> I forgot to run it, but noticed there was a /dev/null, but a
> text file (0644). And I didn't create it anywhere.

That sounds like some program is trying to write to it.

Hm, there is a patch in the Red Hat version of udev that basically makes
udev do the start_udev logic, in the .c file because they do not have a
shell in their initrd.  If you can dig it out of there, that might be a
solution for you to use.

Other than that, how about running strace on start_udev when your rc.S
script calls it?  That might help out.

thanks,

greg k-h
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