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#! /bin/sh
#
# start_udev
# script to initialize /dev by using udev.
#
# Modified for Archlinux by Tobias Powalowski <tpowa@archlinux.org>
#
# Inspired by:
#
# Copyright (C) 2004 Greg Kroah-Hartman <greg@kroah.com>
#
# Released under the GPL v2 only.
#
# This needs to be run at the earliest possible point in the boot
# process.
#
# Based on the udev init.d script
#
# Thanks go out to the Gentoo developers for proving
# that this is possible to do.
#
# Yes, it's very verbose, feel free to turn off all of the echo calls,
# they were there to make me feel better that everything was working
# properly during development...
prog=udev
sysfs_dir=/sys
bin=/sbin/udev
udevd=/sbin/udevd
udev_root="/dev"
trigger_device_events ()
{
/sbin/udevtrigger
}
wait_for_queue ()
{
# disabled because it hangs network boot
#loop=20
#while ! [ "$loop" -gt 0 -a -d /dev/.udev/queue ]; do
# sleep 0.1;
# loop=$(($loop - 1))
#done
/sbin/udevsettle
}
make_extra_nodes ()
{
# there are a few things that sysfs does not export for us.
# these things go here (and remember to remove them in
# remove_extra_nodes()
#
# Thanks to Gentoo for the initial list of these.
ln -sf /proc/self/fd $udev_root/fd
ln -sf /proc/self/fd/0 $udev_root/stdin
ln -sf /proc/self/fd/1 $udev_root/stdout
ln -sf /proc/self/fd/2 $udev_root/stderr
ln -sf /proc/kcore $udev_root/core
}
udev_init ()
{
# don't use udev if sysfs is not mounted.
if [ ! -d $sysfs_dir/block ]; then
exit 1
fi
# Do not mount ramfs, we are already in ramfs
#mount -t ramfs none $udev_root
# propogate /udev from /sys
#echo "Creating initial udev device nodes:"
#echo "making extra nodes"
make_extra_nodes
# check if udevd is already running
#echo "start udev daemon"
/sbin/udevd --daemon
case "$(uname -r)" in
2.6.[0-9]|2.6.[0-9][!0-9]*) ;;
*) if [ -f "/sys/class/tty/console/uevent" ]; then
#echo "Kernel >= 2.6.15 and supports uevents"
# trigger the sorted events
echo -e '\000\000\000\000' > /proc/sys/kernel/hotplug
# catch events that are real fast
mkdir -p /dev/.udev/queue
else
# for older kernels without uevents will be removed when udevstart dies in udev
echo "Kernel does not support uevents, you need a kernel >= 2.6.15!"
exit 1
fi
;;
esac
}
udev_uevents ()
{
# configure all devices
trigger_device_events
# until we know how to do better, just wait for _all_ events to finish
wait_for_queue
}
if [ $# -eq 0 ]; then
udev_init
udev_uevents
fi
[ "$1" = "init" ] && udev_init
[ "$1" = "uevents" ] && udev_uevents
exit 0
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