[Info-vax] CRTL and RMS vs SSIO

[Arne Vajhøj]

On 10/13/2021 8:43 PM, Lawrence D’Oliveiro wrote:
> On Thursday, October 14, 2021 at 7:14:08 AM UTC+13, Simon Clubley
> wrote:
>> On 2021-10-12, Lawrence D?Oliveiro <lawren... at gmail.com> wrote:
>>> On Wednesday, October 13, 2021 at 9:54:14 AM UTC+13, Stephen
>>> Hoffman wrote:
>>>> Possible areas where kernel modifications might necessary?
>>>> Linux memory management is thoroughly two-ring, and OpenVMS
>>>> expectations are four-ring. Do you drop those areas from
>>>> OpenVMS, and force app source code changes?
>>> 
>>> Where is there app code that cares about this?
>>> 
>> 
>> Any program that interacts with DCL for one simple example.
> 
> The fact that DCL runs in supervisor mode is an internal
> implementation matter. It could be replaced by a thread or an
> entirely separate process (even a privileged one), for example, and
> what difference would that make to user-mode code?

If the program sets symbols or define logicals in process
table then it makes a difference.

Arne