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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 supported_kernel() {
61     if [ -f "/sys/class/tty/console/uevent" ]; then
62     2.[012345].*) return 1 ;;
63     esac
64     return 0
65 }
66
67 set_hotplug_handler() {
68     echo "" > /proc/sys/kernel/hotplug
69 }
70                                                                                                                                                         return 0                                             
71 export ACTION=add
72 prog=udev
73 ret=0
74 show "Starting udev"
75 busy
76
77 if ! supported_kernel; then
78     fail
79 fi
80 # mount the tmpfs on ${udev_root%/}, if not already done
81 LANG=C awk "\$2 == \"${udev_root%/}\" && \$3 == \"tmpfs\" { exit 1 }" /proc/mounts && {
82         if LANG=C fgrep -q "none ${udev_root%/}/pts " /proc/mounts; then
83                 PTSDIR=$(mktemp -d ${TMPDIR:-/tmp}/tmpXXXXXX)
84                 mount --move $udev_root/pts "$PTSDIR"
85         fi
86         if LANG=C fgrep -q "none ${udev_root%/}/shm " /proc/mounts; then
87                 SHMDIR=$(mktemp -d ${TMPDIR:-/tmp}/tmpXXXXXX)
88                 mount --move $udev_root/shm "$SHMDIR"
89         fi
90         mount -n -o mode=0755 -t tmpfs none "$udev_root"
91         mkdir -m 0755 $udev_root/pts
92         mkdir -m 0755 $udev_root/shm
93         if [ -n "$PTSDIR" ]; then
94                 mount --move "$PTSDIR" $udev_root/pts
95                 rmdir "$PTSDIR"
96         fi
97         if [ -n "$SHMDIR" ]; then
98                 mount --move "$SHMDIR" $udev_root/shm
99                 rmdir "$SHMDIR"
100         fi
101
102         ret=$(( $ret + $? ))
103 }
104
105 kill_udevd > "$udev_root/null" 2>&1
106
107 if [ -f "/sys/class/tty/console/uevent" ]; then
108         # Start udevd daemon
109         udevd -d
110         
111         # Making extra nodes
112         make_extra_nodes
113         
114         # Setting default hotplug handler
115         set_hotplug_handler
116 else
117     echo "udev requires a kernel >= 2.6.15, not started."
118     exit 0                                                
119 fi
120 ret=$(( $ret + $? ))
121 [ $ret -eq 0 ] && ok || fail
122 exit 0
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