5 # script to initialize /dev by using udev.
7 # Copyright (C) 2004 Greg Kroah-Hartman <greg@kroah.com>
9 # Released under the GPL v2 only.
11 # This needs to be run at the earliest possible point in the boot
14 # Based on the udev init.d script
16 # Thanks go out to the Gentoo developers for proving
17 # that this is possible to do.
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...
23 # default value, if no config present.
28 # don't use udev if sysfs is not mounted.
29 [ -d $sysfs_dir/class ] || exit 1
30 [ -r /proc/mounts ] || exit 1
31 [ -f /etc/udev/udev.conf ] && . /etc/udev/udev.conf
33 . /etc/rc.d/init.d/functions
38 # trim traling slash, code expects it not to be there
39 udev_root=${udev_root%/}
41 create_static_nodes() {
42 /sbin/kmod static-nodes --format=tmpfiles | \
43 while read type file mode uid gid age dev ; do
46 if ! test -d $file; then
47 mkdir -p --mode=$mode $file
57 if ! test -e $file; then
58 mknod --mode=$mode $file $type $maj $min
62 [ $uid = "-" ] || chown $uid $file
63 [ $gid = "-" ] || chgrp $gid $file
68 grep '^[^#]' /etc/udev/links.conf | \
69 while read type name arg1; do
70 [ "$type" -a "$name" -a ! -e "$udev_root/$name" -a ! -L "/dev/$name" ] ||continue
73 if ! test -h $udev_root/$name; then
74 ln -s $arg1 $udev_root/$name
78 if ! test -d $udev_root/$name; then
79 mkdir -p $udev_root/$name
83 if ! test -e /dev/$name; then
84 mknod -m 600 /dev/$name $arg1
88 echo "links.conf: unparseable line ($type $name $arg1)"
92 [ -d /lib/udev/devices ] && cp -a /lib/udev/devices/* /dev/ >/dev/null 2>&1 || :
93 [ -d /lib64/udev/devices ] && cp -a /lib64/udev/devices/* /dev/ >/dev/null 2>&1 || :
97 if [ -x /sbin/pidof ]; then
98 pid=$(/sbin/pidof -x udevd)
99 [ -n "$pid" ] && kill $pid
103 set_hotplug_handler() {
104 echo "" > /proc/sys/kernel/hotplug
107 # find subdirs mounted under $udev_root
109 awk -vudev_root="$udev_root/" '
111 len = length(udev_root);
114 substr($2, 1, len) == udev_root {
115 print substr($2, len + 1)
119 show "Starting udev"; busy
125 # mount the devtmpfs on $udev_root, if not already done
126 awk "\$2 == \"$udev_root\" && \$3 == \"devtmpfs\" { exit 1 }" /proc/mounts && {
127 submounts=$(get_dev_mounts)
129 if [ "$submounts" ]; then
130 # mount to temporary location to be able to move submounts
131 # this needs writable TMPDIR:-/tmp, so it won't work in early boot
132 # but fix is simple: use initramfs instead of romfs
133 devdir=$(mktemp -d ${TMPDIR:-/tmp}/tmpXXXXXX)
137 mount -n -o mode=0755 -t devtmpfs devtmpfs "$devdir"
141 for dir in $submounts; do
142 mount -n --move $udev_root/$dir $devdir/$dir
146 if [ "$submounts" ]; then
147 mount -n --move $devdir $udev_root
152 kill_udevd > "$udev_root/null" 2>&1
154 # Create required static device nodes for the current kernel
158 $udevd --daemon; rc=$?
159 test $rc -eq 0 && ok || fail
160 ret=$(( $ret + $rc ))
163 show "Setup extra nodes"; busy
164 make_extra_nodes; rc=$?
165 test $rc -eq 0 && ok || fail
166 ret=$(( $ret + $rc ))
168 if [ -f /sys/class/tty/console/uevent ]; then
169 # Setting default hotplug handler
173 # retrigger all events
174 show "Retrigger subsystems events"; busy
175 /sbin/udevadm trigger --type=subsystems --action=add; rc=$?
176 test $rc -eq 0 && ok || fail
177 ret=$(( $ret + $rc ))
179 show "Retrigger devices events"; busy
180 /sbin/udevadm trigger --type=devices --action=add; rc=$?
181 test $rc -eq 0 && ok || fail
182 ret=$(( $ret + $rc ))
184 # wait for the events to finish
185 show "udevadm settle"; busy
186 /sbin/udevadm settle; rc=$?
187 test $rc -eq 0 && ok || fail
188 ret=$(( $ret + $rc ))
190 echo "Kernel too old for this udev version"