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Viewing file:     start_udev (4.35 KB)      -rwxr-xr-x

#!/bin/sh
#
# start_udev
#
# script to initialize /dev by using udev.
#
# 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...
#
# don't use udev if sysfs is not mounted.

sysfs_dir=/sys

export TZ=/etc/localtime

[ -d $sysfs_dir/class ] || exit 1
[ -r /proc/mounts ] || exit 1
[ -x /sbin/udevd ] || exit 1
[ -f /etc/udev/udev.conf ] && . /etc/udev/udev.conf
udev_root=${udev_root-/dev}


. /etc/init.d/functions

prog=udev
bin=/sbin/udev
udevd=/sbin/udevd
MAKEDEV="/sbin/MAKEDEV"

xargs_simple () {
	if [ "$1" = "-n" ]; then
		shift
		MAXNR="$1"
		shift
	else
		MAXNR=100
	fi
	NR=$MAXNR
	ARGS=""
	[ -z "$1" ] && set echo

	while read line; do
		if [ $NR -gt 0 ]; then
        		ARGS="$ARGS $line"
	        	NR=$[$NR - 1]
		else
        		"$@" $ARGS
	        	NR=$MAXNR
		        ARGS="$line"
		fi
	done
	if [ -n "$ARGS" ]; then
		"$@" $ARGS
	fi 
}

make_extra_nodes () {
	ln -snf /proc/self/fd $udev_root/fd
	ln -snf /proc/self/fd/0 $udev_root/stdin
	ln -snf /proc/self/fd/1 $udev_root/stdout
	ln -snf /proc/self/fd/2 $udev_root/stderr
	ln -snf /proc/kcore $udev_root/core

	[ -d $udev_root/pts ] || mkdir -m 0755 $udev_root/pts
	[ -d $udev_root/shm ] || mkdir -m 0755 $udev_root/shm
	[ -a /dev/MAKEDEV ] || ln -s $MAKEDEV /dev/MAKEDEV;

	if [ -x $MAKEDEV ]; then
		for i in /etc/udev/makedev.d/*.nodes; do
			if [ -f "$i" ]; then 
				cat "$i" | sed -e 's,#.*,,g' | \
					xargs_simple -n 100 $MAKEDEV -x
			fi
		done 
	fi
	for devdir in /etc/udev/devices /lib/udev/devices; do
		[ -d "$devdir" ] || continue
		pushd $devdir &> "$udev_root/null"
		set *
		if [ "$1" != "*" ]; then
        		cp -ar "$@" $udev_root/ 
			pushd "$udev_root" &> "$udev_root/null"
			[ -x /sbin/restorecon ] && /sbin/restorecon "$@" 
			popd &> "$udev_root/null"
		fi
		popd &> "$udev_root/null"
	done
}

kill_udevd() {
	if [ -x /sbin/pidof ]; then
		pid=`/sbin/pidof -x udevd`
        	[ -n "$pid" ] && kill $pid
	fi
}


wait_for_queue() {
        local timeout=${1:-0}
	local ret=0
	if [ $timeout -gt 0 ]; then
	    /sbin/udevsettle --timeout=$timeout
        else
	    /sbin/udevsettle
	fi
	ret=$?
	if [ $ret -ne 0 ]; then
		echo -n "Wait timeout. Will continue in the background."
	fi
	return $ret;
}

export ACTION=add
prog=udev
ret=0
STRING=$"Starting $prog: "
# propagate $udev_root from /sys
echo -n "$STRING"

# mount the tmpfs on ${udev_root%/}, if not already done
LANG=C awk "\$2 == \"${udev_root%/}\" && \$3 == \"tmpfs\" { exit 1 }" /proc/mounts && {
	if LANG=C fgrep -q "none ${udev_root%/}/pts " /proc/mounts; then
		PTSDIR=$(mktemp -d)
		mount --move $udev_root/pts "$PTSDIR"
	fi
	if LANG=C fgrep -q "none ${udev_root%/}/shm " /proc/mounts; then
		SHMDIR=$(mktemp -d)
		mount --move $udev_root/shm "$SHMDIR"
	fi
	mount -n -o mode=0755 -t tmpfs none "$udev_root"
	mkdir -m 0755 $udev_root/pts
	mkdir -m 0755 $udev_root/shm
	if [ -n "$PTSDIR" ]; then
		mount --move "$PTSDIR" $udev_root/pts
		rmdir "$PTSDIR"
	fi
	if [ -n "$SHMDIR" ]; then
		mount --move "$SHMDIR" $udev_root/shm
		rmdir "$SHMDIR"
	fi
	
	ret=$[$ret + $?]
}

# returns OK if $1 contains $2
strstr() {
  [ "${1#*$2*}" = "$1" ] && return 1
  return 0
}

getval() {
    what=$1
    shift
    for arg; do 
	if strstr "$arg" "$what="; then
	    val=${arg#${what}=*}
	    echo $val
	    return 0
	fi
    done
    return 1
}


make_extra_nodes

kill_udevd > "$udev_root/null" 2>&1

rm -fr /dev/.udev  > "$udev_root/null" 2>&1

cmdline=$(cat /proc/cmdline)

if [ -f "/sys/class/tty/console/uevent" ]; then
	# trigger the sorted events
	echo -e '\000\000\000\000' > /proc/sys/kernel/hotplug
	if strstr "$cmdline" modprobedebug; then
		touch /dev/.modprobe_debug
	else
		rm -f /dev/.modprobe_debug
	fi
	/sbin/udevd -d
	ret=$[$ret + $?]
	if strstr "$cmdline" udevdebug; then
		/sbin/udevcontrol log_priority=debug
	fi
	/sbin/udevtrigger
	ret=$[$ret + $?]
	wait_for_queue $(getval udevtimeout $cmdline)
	ret=$[$ret + $?]
else
	echo -n " kernel too old for this udev version "
	/sbin/udevd -d
	ret=10
fi

ret=$[$ret + $?]
[ $ret -eq 0 ] && success $"$STRING" || failure $"$STRING"
echo
exit 0