/dev/下的设备是通过mknod加上去的，用户通过此设备名来访问驱动。
The following script, scull_load, is part of the scull distribution. The user of a driver that is distributed in the form of a module can invoke such a script from the system's rc.local file or call it manually whenever the module is needed.
#!/bin/shmodule="scull"
device="scull"
mode="664"
# invoke insmod with all arguments we got
# and use a pathname, as newer modutils don't look in . by default
/sbin/insmod ./$module.ko $* || exit 1
# remove stale nodes
rm -f /dev/${device}[0-3]
major=$(awk "\\$2= =\"$module\" {print \\$1}" /proc/devices)
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
# give appropriate group/permissions, and change the group.
# Not all distributions have staff, some have "wheel" instead.
group="staff"
grep -q '^staff:' /etc/group || group="wheel"
chgrp $group /dev/${device}[0-3]
chmod $mode /dev/${device}[0-3]
请
问:linux环境下,/dev/目录下的内容与/proc/下文件devices中的内容有什么区别?我在目标板上做实验时发现,当我向板子上加载驱动
模块时,devices文件中有变化,而/dev下根本没有变化,/dev/下不也应该是设备接点吗,为什么为模块建立设备接点时,/dev/下却没有变
化呢?
请各位帮帮忙,谢谢!!!
/proc/devices/中的设备是通过insmod加载到内核的，它可产生一个major供mknod作为参数。
/dev/*.* 是通过mknod加上去的，格式:mknod device1 c/b major minor 如：mknod dr1 c 254 0，用户通过此设备名来访问你的驱动。