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|
#!/bin/sh
### BEGIN INIT INFO
# Provides: udev
# Required-Start: mountvirtfs
# Required-Stop:
# Default-Start: S
# Default-Stop:
# Short-Description: Start udevd, populate /dev and load drivers.
### END INIT INFO
export TZ=/etc/localtime
[ -d /sys/class ] || exit 1
[ -r /proc/mounts ] || exit 1
[ -x @UDEVD@ ] || exit 1
[ -f /etc/default/udev-cache ] && . /etc/default/udev-cache
[ -f /etc/udev/udev.conf ] && . /etc/udev/udev.conf
[ -f /etc/default/rcS ] && . /etc/default/rcS
readfiles () {
READDATA=""
for filename in $@; do
if [ -r $filename ]; then
while read line; do
READDATA="$READDATA$line"
done < $filename
fi
done
}
kill_udevd () {
pid=`pidof -x udevd`
[ -n "$pid" ] && kill $pid
}
case "$1" in
start)
export ACTION=add
# propagate /dev from /sys
echo "Starting udev"
# Check for requireed devtmpfs before trying to start udev and
# mount a no-existant fs.
if ! grep -q devtmpfs /proc/filesystems
then
echo "Missing devtmpfs, which is required for udev to run";
echo "Halting..."
halt
fi
# mount the devtmpfs on /dev, if not already done
LANG=C awk '$2 == "/dev" && ($3 == "devtmpfs") { exit 1 }' /proc/mounts && {
mount -n -o mode=0755 -t devtmpfs none "/dev"
}
[ -e /dev/pts ] || mkdir -m 0755 /dev/pts
[ -e /dev/shm ] || mkdir -m 1777 /dev/shm
# the automount rule for udev needs /tmp directory available, as /tmp is a symlink
# to /var/tmp which in turn is a symlink to /var/volatile/tmp, we need to make sure
# /var/volatile/tmp directory to be available.
mkdir -p /var/volatile/tmp
# Cache handling.
# A list of files which are used as a criteria to judge whether the udev cache could be reused.
CMP_FILE_LIST="/proc/version /proc/cmdline /proc/devices /proc/atags"
if [ "$DEVCACHE" != "" ]; then
if [ -e $DEVCACHE ]; then
readfiles $CMP_FILE_LIST
NEWDATA="$READDATA"
readfiles /etc/udev/cache.data
OLDDATA="$READDATA"
if [ "$OLDDATA" = "$NEWDATA" ]; then
(cd /; tar xf $DEVCACHE > /dev/null 2>&1)
not_first_boot=1
[ "$VERBOSE" != "no" ] && echo "udev: using cache file $DEVCACHE"
[ -e /dev/shm/udev.cache ] && rm -f /dev/shm/udev.cache
else
# Output detailed reason why the cached /dev is not used
if [ "$VERBOSE" != "no" ]; then
echo "udev: udev cache not used"
echo "udev: we use $CMP_FILE_LIST as criteria to judge whether the cache /dev could be resued"
echo "udev: olddata: $OLDDATA"
echo "udev: newdata: $NEWDATA"
fi
echo "$NEWDATA" > /dev/shm/udev.cache
fi
else
if [ "$ROOTFS_READ_ONLY" != "yes" ]; then
# If rootfs is not read-only, it's possible that a new udev cache would be generated;
# otherwise, we do not bother to read files.
readfiles $CMP_FILE_LIST
echo "$READDATA" > /dev/shm/udev.cache
fi
fi
fi
# make_extra_nodes
kill_udevd > "/dev/null" 2>&1
# trigger the sorted events
echo -e '\000\000\000\000' > /proc/sys/kernel/hotplug
@UDEVD@ -d
udevadm control --env=STARTUP=1
if [ "$not_first_boot" != "" ];then
udevadm trigger --action=add --subsystem-nomatch=tty --subsystem-nomatch=mem --subsystem-nomatch=vc --subsystem-nomatch=vtconsole --subsystem-nomatch=misc --subsystem-nomatch=dcon --subsystem-nomatch=pci_bus --subsystem-nomatch=graphics --subsystem-nomatch=backlight --subsystem-nomatch=video4linux --subsystem-nomatch=platform
(udevadm settle --timeout=3; udevadm control --env=STARTUP=)&
else
udevadm trigger --action=add
udevadm settle
fi
;;
stop)
echo "Stopping udevd"
start-stop-daemon --stop --name udevd --quiet
;;
restart)
$0 stop
sleep 1
$0 start
;;
status)
pid=`pidof -x udevd`
if [ -n "$pid" ]; then
echo "udevd (pid $pid) is running ..."
else
echo "udevd is stopped"
fi
;;
*)
echo "Usage: $0 {start|stop|status|restart}"
exit 1
esac
exit 0
|
