poky/meta/recipes-core/udev/eudev/init

#!/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 SYSCONF_CACHED="/etc/udev/cache.data" SYSCONF_TMP="/dev/shm/udev.cache" DEVCACHE_REGEN="/dev/shm/udev-regen" # create to request cache regen

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" [ -f /proc/atags ] && CMP_FILE_LIST="$CMP_FILE_LIST /proc/atags"

List of files whose metadata (size/mtime/name) will be included in cached

system state.

META_FILE_LIST="lib/udev/rules.d/* etc/udev/rules.d/*"

Command to compute system configuration.

sysconf_cmd () { cat -- $CMP_FILE_LIST stat -c '%s %Y %n' -- $META_FILE_LIST | awk -F/ '{print $1 " " $NF;}' }

[ -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

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 -m 1777 -p /var/volatile/tmp

# Cache handling.
if [ "$DEVCACHE" != "" ]; then
        if [ -e $DEVCACHE ]; then
	    sysconf_cmd > "$SYSCONF_TMP"
	    if cmp $SYSCONF_CACHED $SYSCONF_TMP >/dev/null; then
                        tar xmf $DEVCACHE -C / -m
                        not_first_boot=1
                        [ "$VERBOSE" != "no" ] && echo "udev: using cache file $DEVCACHE"
                        [ -e $SYSCONF_TMP ] && rm -f "$SYSCONF_TMP"
                        [ -e "$DEVCACHE_REGEN" ] && rm -f "$DEVCACHE_REGEN"
                else
		    # Output detailed reason why the cached /dev is not used
		    cat <<EOF

udev: Not using udev cache because of changes detected in the following files: udev: $CMP_FILE_LIST udev: $META_FILE_LIST udev: The udev cache will be regenerated. To identify the detected changes, udev: compare the cached sysconf at $SYSCONF_CACHED udev: against the current sysconf at $SYSCONF_TMP EOF touch "$DEVCACHE_REGEN" fi else if [ "$ROOTFS_READ_ONLY" != "yes" ]; then # If rootfs is not read-only, it's possible that a new udev cache would be generated; # otherwise, we do not bother to read files. touch "$DEVCACHE_REGEN" fi fi fi

# make_extra_nodes
kill_udevd > "/dev/null" 2>&1

# trigger the sorted events
[ -e /proc/sys/kernel/hotplug ] && echo -e '\000' >/proc/sys/kernel/hotplug
@UDEVD@ -d

udevadm control --env=STARTUP=1
if [ "$not_first_boot" != "" ];then
        if [ "$PROBE_PLATFORM_BUS" != "yes" ]; then
            PLATFORM_BUS_NOMATCH="--subsystem-nomatch=platform"
        else
            PLATFORM_BUS_NOMATCH=""
        fi
        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 $PLATFORM_BUS_NOMATCH
        (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