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From: "Rugxulo (rugxulo AT gmail DOT com) [via djgpp AT delorie DOT com]" <djgpp AT delorie DOT com>
Date: Fri, 22 Mar 2024 19:30:28 -0500
Message-ID: <CAA-ihx_+CvPpsJzTiuf3BzOvZ_JCq7nUNwsOAfF5o4LMMHTEEA@mail.gmail.com>
Subject: Re: Error handling of ECX in __dpmi_set_page_attributes()
To: djgpp AT delorie DOT com
Cc: Pali <pali AT pali DOT im>
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Reply-To: djgpp AT delorie DOT com

Hi,

On Thu, Mar 21, 2024 at 2:23 AM Eli Zaretskii (eliz AT gnu DOT org) [via
djgpp AT delorie DOT com] <djgpp AT delorie DOT com> wrote:
>
> > DPMI 1.0 spec says that if function 0507H is unsuccessful then it sets
> > ECX to number of pages that have been set.
>
> It is not clear from the spec whether ECX is _always_ set, regardless
> of the error code returned in AX.  Some error codes don't sound like
> they could happen after successfully setting attributes of several
> pages.  Do we have any information about what the various DPMI 1.0
> hosts actually do in this case?  Should we at least check in the
> function's code that the value in ECX is non-negative and smaller than
> the value of ECX set by the caller?

Sudley Place's DPMIONE is GPL'd these days, IIRC, and supports DPMI 1.0.
Otherwise, I'd mainly suggest testing CWSDPMI (obviously) and
(Japheth's HX) HDPMI32.

* https://github.com/sudleyplace/DPMIONE
* https://github.com/Baron-von-Riedesel/HX