From owner-freebsd-hackers  Mon Mar 20 19:34:11 2000
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Date: Mon, 20 Mar 2000 22:34:41 -0500
From: "Gary T. Corcoran" <garycor@home.com>
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To: Darrell Anderson <anderson@cs.duke.edu>
Cc: freebsd-hackers@FreeBSD.ORG
Subject: Re: How to read a file from a device driver?
References: <200003201606.LAA12793@cold.cs.duke.edu>
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Darrell,

> > I'm trying to initialize a network device, and I'm trying to download
> > code *into* my device from some binary system files.  There is no "user
> > space" or user process, for that matter, to deal with at this point. I
> > just want to (at this step) open a file(s) directly from my device
> > driver, read the file(s), and download the relevant parts to my device.
> 
> sysctl might also do the trick.  to answer your question, here's some code:
> 
> struct vnode *
> vp_open(char *fname)
> {
>         struct vnode *vp;
>         struct nameidata nd;
>         int error;
> 
>         NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, fname, curproc);

< rest of good code sample snipped - see previous message>

This is great - thanks!

One question though (since I'm new to FreeBSD drivers):
Is "curproc" a global variable that will be set to the "right thing"
while my device driver is executing?   Presuming that it is, it looks
like I can just take your sample code and run with it...  :)

Thanks,
Gary


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