sbull_load

本源码是将述嵌入式LINUX驱动程序例程

#!/bin/sh
module="sbull"
device="sbull"
mode="664"
chardevice="sbullr"

# 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/${device}[0-3] /dev/${device}

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

#
# Look and see if the raw device is present as well.  If so set it up.
#
if ! grep " $chardevice\$" /proc/devices > /dev/null; then
    exit
fi
charmajor=`cat /proc/devices | awk "\\$2==\"$chardevice\" {print \\$1}"`

rm -f /dev/${chardevice}[0-3] /dev/${chardevice}

mknod /dev/${chardevice}0 c $charmajor 0
mknod /dev/${chardevice}1 c $charmajor 1
mknod /dev/${chardevice}2 c $charmajor 2
mknod /dev/${chardevice}3 c $charmajor 3
ln -sf ${chardevice}0 /dev/${chardevice}
chgrp $group /dev/${chardevice}[0-3] 
chmod $mode  /dev/${chardevice}[0-3]