package/udev/S10udev

   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/udevd
  27 test -x $UDEV_BIN || exit 5
  28 UDEVSTART_BIN=/sbin/udevstart
  29 test -x $UDEVSTART_BIN || exit 5
  30
  31 # Check for config file and read it
  32 UDEV_CONFIG=/etc/udev/udev.conf
  33 test -r $UDEV_CONFIG || exit 6
  34 . $UDEV_CONFIG
  35
  36 # Directory where sysfs is mounted
  37 SYSFS_DIR=/sys
  38
  39 case "$1" in
  40     start)
  41         # mount sysfs if it's not yet mounted
  42         if [ ! -d $SYSFS_DIR ]; then
  43             echo "${0}: SYSFS_DIR \"$SYSFS_DIR\" not found"
  44             exit 1
  45         fi
  46         grep -q "^sysfs $SYSFS_DIR" /proc/mounts ||
  47         mount -t sysfs /sys /sys ||
  48         exit 1
  49
  50         # mount $udev_root as ramfs if it's not yet mounted
  51         # we know 2.6 kernels always support ramfs
  52         if [ ! -d $udev_root ]; then
  53             echo "${0}: udev_root \"$udev_root\" not found"
  54             exit 1
  55         fi
  56         grep -q "^udev $udev_root" /proc/mounts ||
  57         mount -t ramfs udev $udev_root ||
  58         exit 1
  59
  60         mkdir $udev_root/pts $udev_root/shm
  61
  62         # populate /dev (normally)
  63         echo -n "Populating $udev_root using udev: "
  64         echo -e '\000\000\000\000' > /proc/sys/kernel/hotplug
  65         $UDEV_BIN -d || (echo "FAIL" && exit 1)
  66         $UDEVSTART_BIN || (echo "FAIL" && exit 1)
  67         mount -t devpts /dev/pts /dev/pts || (echo "FAIL" && exit 1)
  68         echo "done"
  69         ;;
  70     stop)
  71         # Stop execution of events
  72         udevcontrol stop_exec_queue
  73         killall udevd
  74         ;;
  75     *)
  76         echo "Usage: $0 {start|stop}"
  77         exit 1
  78         ;;
  79 esac
  80
  81
  82 exit 0