a puzzle about FreeBSD

[=?gb2312?B?1twg1tw=?=]

You'd better read "the design and implementation of the freebsd operating 
system" written by McKusick himself.

>From: ¹ùÕñ»ª <gzh at net.pku.edu.cn>
>To: <freebsd-hackers at freebsd.org>
>Subject: a puzzle about FreeBSD
>Date: Sat, 19 Nov 2005 21:51:58 +0800
>
>I am very interested in FreeBSD but it is difficult to master it. There is
>little resource related to the most basic and fundamental problems.
>
>I read the source code of a project. I don¡¯t understand SYSCTL_IN macro 
and
>SYSCTL_PROC macro. I want to know when my function registered in 
SYSCTL_PROC
>is called.
>
>In addition, can you give me some advanced reference books or websites 
which
>are useful?
>
>
>
>Best wishes
>
>Jenvor
>
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