udev on real Linux from scratch

["Gabor Z. Papp" <gzp@papp.hu>]

Hello,

the udev FAQ pointed me to this list.

Time hit me too, and started to migrating from 2.4 kernels to 2.6. :-P

I have some questions that not really clear to me, I think this part
of documentation could be expanded too. :-)

First of all, someone could take a look at this init process and
confirm me its ok, or something still wrong. Finally got working /dev
directory with this setup, but I'm not sure its correct:

   mount -n -t proc proc /proc

   mount -n -t sysfs sysfs /sys

   echo "" > /proc/sys/kernel/hotplug

   mount -n -o mode\a55 -t tmpfs tmpfs /dev

   mkdir -p /dev/pts

   mount -n -o mode\x0620 -t devpts devpts /dev/pts

   udevd --daemon

   udevstart

My /etc/udev dir is mostly empty (only the default udev.conf exist)
and will fill up the rules.d/ dir depending on my needs.
I'm not starting any other udev* related program.
The original /dev/ directory has only console device. 

Well, my another important question is, that starting udevd --daemon
gives me a "cannot open /dev/null" error message.

I have found this message in the udevd.c file around line 1018:

        /* make sure std{in,out,err} fd's are in a sane state */
        fd = open("/dev/null", O_RDWR);
        if (fd < 0) {
                fprintf(stderr, "cannot open /dev/null\n");
                err("cannot open /dev/null");
        }

Should I create /dev/null after mounting tmpfs on /dev/?

Thanks for the help.

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