From owner-freebsd-hackers@FreeBSD.ORG  Sun Sep 25 12:24:51 2005
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Date: Sun, 25 Sep 2005 13:24:47 +0100
From: David Malone <dwmalone@maths.tcd.ie>
To: kamal kc <kamal_ckk@yahoo.com>
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Cc: freebsd-hackers@freebsd.org
Subject: Re: kernel hack
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On Sun, Sep 25, 2005 at 03:31:51AM -0700, kamal kc wrote:
> does anybody know what is the best way
> to start kernel hack.

It isn't quite clear what you mean, but presuming you mean "make
a change to the FreeBSD kernel that you use" then:

1) First learn how to recompile your kernel.
   You can get details from the FreeBSD handbook
   (http://www.freebsd.org/handbook/).
2) Look under /usr/src/sys for the kernel source code.
   The main bit is in /usr/src/sys/kern, networking
   lives under /usr/src/sys/net* and so on.
3) Change the code you want and then recompie the kernel.
   Remember to keep an old kernel around incase you make
   a mistake.

	David.