start_udev

   1 #!/bin/sh
   2 #
   3 # start_udev
   4 #
   5 # script to initialize /dev by using udev.
   6 #
   7 # Copyright (C) 2004 Greg Kroah-Hartman <greg@kroah.com>
   8 #
   9 # Released under the GPL v2 only.
  10 #
  11 # This needs to be run at the earliest possible point in the boot
  12 # process.
  13 #
  14 # Based on the udev init.d script
  15 #
  16 # Thanks go out to the Gentoo developers for proving
  17 # that this is possible to do.
  18 #
  19 # Yes, it's very verbose, feel free to turn off all of the echo calls,
  20 # they were there to make me feel better that everything was working
  21 # properly during development...
  22
  23 # default value, if no config present.
  24 udev_root="/dev/"
  25 sysfs_dir="/sys"
  26 udevd_timeout=8
  27
  28 # don't use udev if sysfs is not mounted.
  29 [ -d $sysfs_dir/class ] || exit 1
  30 [ -r /proc/mounts ] || exit 1
  31 [ -x /sbin/udev ] || exit 1
  32 [ -f /etc/udev/udev.conf ] && . /etc/udev/udev.conf
  33
  34 . /etc/rc.d/init.d/functions
  35
  36 prog=udev
  37 bin=/sbin/udev
  38 udevd=/sbin/udevd
  39
  40 make_extra_nodes () {
  41         grep '^[^#]' /etc/udev/links.conf | \
  42         while read type name arg1; do
  43             [ "$type" -a "$name" -a ! -e "$udev_root/$name" -a ! -L "/dev/$name" ] ||continue
  44             case "$type" in
  45                 L) ln -s $arg1 $udev_root/$name ;;
  46                 D) mkdir -p $udev_root/$name ;;
  47                 *) echo "links.conf: unparseable line ($type $name $arg1)" ;;
  48             esac
  49         done
  50         cp -a /lib/udev/devices/* /dev/ >/dev/null 2>&1 || :
  51 }
  52
  53 kill_udevd() {
  54         if [ -x /sbin/pidof ]; then
  55                 pid=`/sbin/pidof -x udevd`
  56                 [ -n "$pid" ] && kill $pid
  57         fi
  58 }
  59
  60 set_hotplug_handler() {
  61     echo "" > /proc/sys/kernel/hotplug
  62 }
  63                                                                                                                                                         return 0
  64 export ACTION=add
  65 prog=udev
  66 ret=0
  67 show "Starting udev"
  68 busy
  69
  70 if ! supported_kernel; then
  71     fail
  72 fi
  73 # mount the tmpfs on ${udev_root%/}, if not already done
  74 LANG=C awk "\$2 == \"${udev_root%/}\" && \$3 == \"tmpfs\" { exit 1 }" /proc/mounts && {
  75         if LANG=C fgrep -q "none ${udev_root%/}/pts " /proc/mounts; then
  76                 PTSDIR=$(mktemp -d ${TMPDIR:-/tmp}/tmpXXXXXX)
  77                 mount --move $udev_root/pts "$PTSDIR"
  78         fi
  79         if LANG=C fgrep -q "none ${udev_root%/}/shm " /proc/mounts; then
  80                 SHMDIR=$(mktemp -d ${TMPDIR:-/tmp}/tmpXXXXXX)
  81                 mount --move $udev_root/shm "$SHMDIR"
  82         fi
  83         mount -n -o mode=0755 -t tmpfs none "$udev_root"
  84         mkdir -m 0755 $udev_root/pts
  85         mkdir -m 0755 $udev_root/shm
  86         if [ -n "$PTSDIR" ]; then
  87                 mount --move "$PTSDIR" $udev_root/pts
  88                 rmdir "$PTSDIR"
  89         fi
  90         if [ -n "$SHMDIR" ]; then
  91                 mount --move "$SHMDIR" $udev_root/shm
  92                 rmdir "$SHMDIR"
  93         fi
  94
  95         ret=$(( $ret + $? ))
  96 }
  97
  98 kill_udevd > "$udev_root/null" 2>&1
  99
 100 if [ -f "/sys/class/tty/console/uevent" ]; then
 101         # Start udevd daemon
 102         udevd --daemon
 103
 104         # Making extra nodes
 105         make_extra_nodes
 106
 107         # Setting default hotplug handler
 108         set_hotplug_handler
 109
 110         # retrigger all events
 111         mkdir -p /dev/.udev/queue
 112         list=$(echo /sys/bus/*/devices/*/uevent)
 113         list="$list $(echo /sys/class/*/*/uevent)"
 114         list="$list $(echo /sys/block/*/uevent /sys/block/*/*/uevent)"
 115         for i in $list; do
 116             case "$i" in
 117                 */device/uevent|*\**)
 118                     continue
 119                     ;;
 120                 */class/mem/*|*/class/tty/*)
 121                     first="$first $i"
 122                     ;;
 123                 */block/md*)
 124                     last="$last $i"
 125                     ;;
 126                 */*)
 127                     default="$default $i"
 128                     ;;
 129             esac
 130         done
 131
 132         # trigger the sorted events
 133         for i in $first $default $last; do
 134             echo "add" > "$i"
 135         done
 136
 137
 138         # wait for the events to finish
 139         loop=300
 140         while test -d /dev/.udev/queue; do
 141             sleep 0.1;
 142             test "$loop" -gt 0 || break
 143             loop=$(($loop - 1))
 144         done
 145 else
 146         echo "udev requires a kernel >= 2.6.15, not started."
 147         exit 0
 148 fi
 149
 150 ret=$(( $ret + $? ))
 151 [ $ret -eq 0 ] && ok || fail
 152 exit 0