scull_load

本源码是将述嵌入式LINUX驱动程序例程

#!/bin/sh
module="scull"
device="scull"
mode="664"

# Group: since distributions do it differently, look for wheel or use staff
if grep '^staff:' /etc/group > /dev/null; then
    group="staff"
else
    group="wheel"
fi

# invoke insmod with all arguments we got
# and use a pathname, as newer modutils don't look in . by default
/sbin/insmod -f ./$module.o $* || exit 1

major=`cat /proc/devices | awk "\\$2==\"$module\" {print \\$1}"`

# Remove stale nodes and replace them, then give gid and perms
# Usually the script is shorter, it's scull that has several devices in it.

rm -f /dev/${device}[0-3]
mknod /dev/${device}0 c $major 0
mknod /dev/${device}1 c $major 1
mknod /dev/${device}2 c $major 2
mknod /dev/${device}3 c $major 3
ln -sf ${device}0 /dev/${device}
chgrp $group /dev/${device}[0-3] 
chmod $mode  /dev/${device}[0-3]

rm -f /dev/${device}priv
mknod /dev/${device}priv  c $major 16
chgrp $group /dev/${device}priv
chmod $mode  /dev/${device}priv

rm -f /dev/${device}pipe[0-3]
mknod /dev/${device}pipe0 c $major 32
mknod /dev/${device}pipe1 c $major 33
mknod /dev/${device}pipe2 c $major 34
mknod /dev/${device}pipe3 c $major 35
ln -sf ${device}pipe0 /dev/${device}pipe
chgrp $group /dev/${device}pipe[0-3] 
chmod $mode  /dev/${device}pipe[0-3]

rm -f /dev/${device}single
mknod /dev/${device}single  c $major 48
chgrp $group /dev/${device}single
chmod $mode  /dev/${device}single

rm -f /dev/${device}uid
mknod /dev/${device}uid   c $major 64
chgrp $group /dev/${device}uid
chmod $mode  /dev/${device}uid

rm -f /dev/${device}wuid
mknod /dev/${device}wuid  c $major 80
chgrp $group /dev/${device}wuid
chmod $mode  /dev/${device}wuid