package/udev/init-udev

   1 #!/bin/sh
   2 #
   3 # udev  This is a minimal non-LSB version of a UDEV startup script.  It
   4 #       was derived by stripping down the udev-058 LSB version for use
   5 #       with buildroot on embedded hardware using Linux 2.6.12+ kernels.
   6 #
   7 #       You may need to customize this for your system's resource limits
   8 #       (including startup time!) and administration.  For example, if
   9 #       your early userspace has a custom initramfs or initrd you might
  10 #       need /dev much earlier; or without hotpluggable busses (like USB,
  11 #       PCMCIA, MMC/SD, and so on) your /dev might be static after boot.
  12 #
  13 #       This script assumes your system boots right into the eventual root
  14 #       filesystem, and that init runs this udev script before any programs
  15 #       needing more device nodes than the bare-bones set -- /dev/console,
  16 #       /dev/zero, /dev/null -- that's needed to boot and run this script.
  17 #
  18
  19 # old kernels don't use udev
  20 case $(uname -r) in
  21 2.6*|2.7*)      ;;
  22 *)              exit 0;;
  23 esac
  24
  25 # Check for missing binaries
  26 UDEV_BIN=/sbin/udev
  27 test -x $UDEV_BIN || exit 5
  28 UDEVSTART_BIN=/sbin/udevstart
  29 test -x $UDEVSTART_BIN || exit 5
  30 UDEVD_BIN=/sbin/udevd
  31 test -x $UDEVD_BIN || exit 5
  32
  33 # Check for config file and read it
  34 UDEV_CONFIG=/etc/udev/udev.conf
  35 test -r $UDEV_CONFIG || exit 6
  36 . $UDEV_CONFIG
  37
  38 # Directory where sysfs is mounted
  39 SYSFS_DIR=/sys
  40
  41 case "$1" in
  42     start)
  43         # mount sysfs if it's not yet mounted
  44         if [ ! -d $SYSFS_DIR ]; then
  45                 echo "${0}: SYSFS_DIR \"$SYSFS_DIR\" not found"
  46                 exit 1
  47         fi
  48         grep -q "^sysfs $SYSFS_DIR" /proc/mounts ||
  49                 mount -t sysfs /sys /sys ||
  50                 exit 1
  51
  52         # mount $udev_root as ramfs if it's not yet mounted
  53         # we know 2.6 kernels always support ramfs
  54         if [ ! -d $udev_root ]; then
  55                 echo "${0}: udev_root \"$udev_root\" not found"
  56                 exit 1
  57         fi
  58         grep -q "^udev $udev_root" /proc/mounts ||
  59                 mount -t ramfs udev $udev_root ||
  60                 exit 1
  61
  62         # heck, go whole-hog:  use only new style hotplug
  63         # echo $UDEV_BIN > /proc/sys/kernel/hotplug
  64
  65         # populate /dev (normally)
  66         echo -n "Populating $udev_root using udev... "
  67         $UDEVSTART_BIN || (echo "FAIL" && exit 1)
  68         mkdir $udev_root/pts $udev_root/shm
  69         mount /dev/pts
  70         echo "done"
  71
  72         # Start udevd
  73         echo -n "Starting udevd... "
  74         $UDEVD_BIN --daemon || (echo "FAIL" && exit 1)
  75         echo "done"
  76         ;;
  77     stop)
  78         # do nothing
  79         ;;
  80     *)
  81         echo "Usage: $0 {start|stop}"
  82         exit 1
  83         ;;
  84 esac