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From: Rod Pemberton <invalid AT lkntrgzxc DOT com>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: [PATCH] exec: fix inversions in leak detection logic
Date: Sat, 17 Aug 2019 21:16:00 -0400
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On Sat, 17 Aug 2019 22:47:00 +0300
"stsp (stsp2 AT yandex DOT ru) [via djgpp AT delorie DOT com]" <djgpp AT delorie DOT com>
wrote:

> 17.08.2019 22:02, Rod Pemberton пишет:


> If the get descriptor call fails
> we also know this descriptor is currently not user allocated.
> ---
> Which means freed!

No, it doesn't.

Windows - i.e., a non-user - allocates descriptors for itself.

The DPMI host would also be a non-user which allocates descriptors for
itself.

IIRC, the CRT startup code also allocates descriptors for itself.

>> I'm confused by this patch, but I'm also not familiar with what the
>> code does.  Even so, I suspect you fixed the problem in the wrong
>> manner.  Could you try only modifying the mask to see if that fixes
>> your issue?  
>
>This will make thing very DPMI-host-dependent.
>One host only clears P, another one can do other
>things.

DJGPP DPMI apps work for both DOS with DPMI and for Windows in console
windows with Windows' built-in DPMI for V86 mode.

DJGPP code can already run under many DPMI hosts: CWSDPMI, CWSDPR0,
PMODETSR, and Windows 98/SE/ME/NT/2K/XP DPMI in console windows, etc.


Rod Pemberton 
-- 
Let me say it yet again.  Reducing gun violence doesn't reduce
violence.  Dead is dead, whether by gun, car, hammer, club, or knife.