Re: CVS commit: src/sys

[Joerg Sonnenberger <joerg%britannica.bec.de@localhost>]

On Tue, Mar 25, 2008 at 02:36:39PM +0000, David Brownlee wrote:
> On Tue, 25 Mar 2008, Joerg Sonnenberger wrote:
>
>> On Mon, Mar 24, 2008 at 02:27:13PM +1300, Dave Sainty wrote:
>>> No-one is going to be surprised to switch to a text console with DDB if
>>> they hit C-M-ESC, just grateful :) And it's a keystroke that people already
>>> know.
>>
>> The problem is that it doesn't *switch* to a text console. It kicks the
>> VGA device into shape and if you want to continue, the system is very
>> likely to end up in DDB soon enough again.
>
>       Could it revoke all access to the relevant video device, so next
>       time X tries to read/write the hardware it aborts?

Only by altering the IOPL of the X server and by forcefully closing all
instances of /dev/mem it holds open. I am not sure that is a clean
approach...

Joerg