recipes/busybox/busybox-1.2.2/busybox-mdev.sh

   1 #!/bin/sh
   2 MDEV=/sbin/mdev
   3 DESC="Busybox mdev setup"
   4
   5 # Complain if thing's aren't right
   6 if [ ! -e /proc/filesystems ]; then
   7   echo "mdev requires a mounted procfs, not started."
   8   exit 1
   9 fi
  10
  11 if ! grep -q '[[:space:]]tmpfs$' /proc/filesystems; then
  12   echo "mdev requires tmpfs support, not started."
  13   exit 1
  14 fi
  15
  16 if [ ! -d /sys/class/ ]; then
  17   echo "mdev requires a mounted sysfs, not started."
  18   exit 1
  19 fi
  20
  21 if [ ! -e /proc/sys/kernel/hotplug ]; then
  22   echo "mdev requires hotplug support, not started."
  23   exit 1
  24 fi
  25
  26 # We need to unmount /dev/pts/ and remount it later over the tmpfs
  27 if mountpoint -q /dev/pts/; then
  28   umount -l /dev/pts/
  29 fi
  30
  31 if mountpoint -q /dev/shm/; then
  32   umount -l /dev/shm/
  33 fi
  34
  35 # Create tmpfs for /dev
  36 echo "Creating tmpfs at /dev"
  37 mount -t tmpfs tmpfs /dev -o size=800k
  38
  39 # Register mdev as hotplug event helper
  40 echo "$MDEV" > /proc/sys/kernel/hotplug
  41
  42 # Populate /dev from /sys info
  43 echo "Populating /dev using mdev"
  44 $MDEV -s
  45
  46 # Touch .udev to inform scripts that /dev needs no further setup
  47 touch /dev/.udev
  48
  49 # Mount devpts
  50 TTYGRP=5
  51 TTYMODE=620
  52 mkdir -m 755 -p /dev/pts
  53 if [ ! -e /dev/ptmx ]; then
  54     mknod -m 666 /dev/ptmx c 5 2
  55 fi
  56 mount -t devpts devpts /dev/pts -onoexec,nosuid,gid=$TTYGRP,mode=$TTYMODE
  57
  58 # Make shm directory
  59 mkdir -m 755 -p /dev/shm
  60
  61 # Make extraneous links
  62 ln -sf /proc/self/fd /dev/fd
  63 ln -sf /proc/self/fd/0 /dev/stdin
  64 ln -sf /proc/self/fd/1 /dev/stdout
  65 ln -sf /proc/self/fd/2 /dev/stderr
  66 ln -sf /proc/kcore /dev/core
  67 ln -sf /proc/asound/oss/sndstat /dev/sndstat
  68
  69 exit 0