From: Roman Shaposhnick <rvs@sun.com>
To: Fans of the OS Plan 9 from Bell Labs <9fans@cse.psu.edu>
Subject: Re: [9fans] quick stupid question
Date: Mon, 5 Jun 2006 18:34:40 -0700 [thread overview]
Message-ID: <20060606013440.GC27456@submarine> (raw)
In-Reply-To: <018062f584bd7cfd4c738d23f969e2fe@collyer.net>
On Mon, Jun 05, 2006 at 06:24:31PM -0700, geoff@collyer.net wrote:
> It looks like it's initialised in 9/pc/screen.c, for example in
> screensize(), and 9/pc/devvga.c, for example in vgaopen() and the
> routines it calls. Look for
>
> scr = &vgascreen[0];
>
> which is a pedantic way of writing
>
> scr = vgascreen;
>
> and see how scr is used.
Here's the thing -- it looks like everything assumes that the place
'scr' ends up pointing to has been already initialized somehow. Every
sourceline that I've been able to identify using
"grep vgascreen /sys/src/9/*/*"
does exactly what you've mentioned: 'scr = &vgascreen[0];' but the problem
is -- scr never gets written to, which means there's not way vgascreen could
be initialized.
Or am I missing something really obvious here ?
Thanks,
Roman.
next prev parent reply other threads:[~2006-06-06 1:34 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-06-06 1:10 Roman Shaposhnick
2006-06-06 1:24 ` geoff
2006-06-06 1:34 ` Roman Shaposhnick [this message]
2006-06-06 2:41 ` Russ Cox
2006-06-06 1:53 ` Roman Shaposhnick
2006-06-06 2:32 ` Russ Cox
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