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From: "Maxim Zhuravlev" <thIOretic@FreeBSD.org>
Date: Tue, 8 May 2007 02:55:48 +0400
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Subject: Re: Writing to a file
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"Sonja Milicic" <tanarri@geri.cc.fer.hr> wrote 

> So, could anyone please give me a detailed
> explanation of how to open a file in kernel and write to it - best data
> types to use, functions, what to look out for, maybe a link to tutorial
> or manual that deals with this (if such a thing exists), etc.?


Not really an explanation, but may be you should start from 
vfs kernel subsystem (it should be nicely documented, I guess :)). 
Even more adequate, study file-related syscalls implementation.
If not done already.

WBR,
Maxim