Date: Mon, 05 Sep 2005 08:46:11 +0200 From: "Poul-Henning Kamp" <phk@phk.freebsd.dk> To: Jeb Campbell <jebc@c4solutions.net> Cc: freebsd-fs@freebsd.org Subject: Re: kernel newb -- read/write to a local file from in kernel Message-ID: <51974.1125902771@phk.freebsd.dk> In-Reply-To: Your message of "Mon, 05 Sep 2005 01:44:33 CDT." <431BE951.4070101@c4solutions.net>
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In message <431BE951.4070101@c4solutions.net>, Jeb Campbell writes: >I'm trying to learn about kernel programming and as a weekend project >I've started writing a Netgraph to file/dev module. > >The Netgraph stuff was pretty easy, but I'm at a loss on the file access >part as I've never done anything in-kernel. > >After much searching (most of it not knowing what I was looking for), I >think that I'm looking for something like "Vnode interface mechanics, >write to a local file" as taught in Mr. McKusick's "FreeBSD Kernel >Internals: An Intensive Code Walkthrough". > >I've looked at nullfs/null_vnops.c, but I think that is more of a >pass-through example. Does anyone know of any online code that shows >the process of opening a file/device for read/write? In the spirit of education I won't tell you "how to" but only "where to look": ktrace, coredumps and accounting all writes to files from the kernel. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk@FreeBSD.ORG | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence.
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