udev/start_udev

   1 #!/bin/sh
   2
   3 # - if /dev is not mounted - mount as a devtmpfs (CONFIG_DEVTMPFS=y)
   4 # - if /dev is mounted (e.g. due to handover from initramfs or
   5 #   CONFIG_DEVTMPFS_MOUNT=y), remount with specific options
   6 # - some video drivers require exec access in /dev, thus it's set here
   7 # - for completness, we add few sanity limits (2k non-empty files, 16k inodes)
   8
   9 UDEVOPTS="exec,nosuid,noatime,mode=0755,nr_blocks=2048,nr_inodes=16384"
  10 if /bin/mountpoint -q /dev ; then
  11         /bin/mount -n -o remount,${UDEVOPTS} dev /dev
  12 else
  13         /bin/mount -n -t devtmpfs -o ${UDEVOPTS} dev /dev
  14 fi
  15
  16 # mount /run directory
  17 /bin/mount -n -t tmpfs -o mode=0755,nosuid,nodev,exec tmpfs /run
  18
  19 # make sure hotplugger is not set
  20 echo > /proc/sys/kernel/hotplug
  21
  22 # since v155, udevd automatically copies /lib/udev/devices
  23 # and creates /proc/{kcore,self/fd/{0,1,2}} symlinks
  24
  25 # launch udev daemon, make sure it's not running first
  26 test -z "$(/bin/pidof -s udevd)" && /sbin/udevd --daemon
  27
  28 # coldplug devices and wait for the queue to be processed
  29 /sbin/udevadm trigger --type=subsystems --action=add
  30 /sbin/udevadm trigger --type=devices --action=add
  31 /sbin/udevadm settle
  32