Write kernel module 4 FreeBSD

I have write a test kernel module for FreeBSD 6.1, it's very simple, and make no sense, it's just proof of concept!
this module is named hello.ko, it's source code is hello.c, and the module build script is Makefile.
Okay, now let's see some effect of that module.
first, cd into the directory of the source and built module, which is /root/src in my configuration!
second, load the hello.ko into kernel space using the kldload command, which is somewhat resemble the inmod utility of Linux! Plz note: because the hello.ko is not located under the kernel module directory(which should be /boot/kernel/), so the parameter passed to kldload must be "./hello.ko", rather than hello.ko, the suffix .ko is not matter, you can omit it. It completely depends on your choice!
then, we will find that a new device jump out of /dev/, which is /dev/hello here. Okay, that is the device special file created by hello.ko, but it's absolutely useless. you can read and write something from or to it, but it won't do any real work.<%2

本文来自ChinaUnix博客，如果查看原文请点：http://blog.chinaunix.net/u/270/showart_207541.html

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