Date:	Wed, 5 Feb 1997 15:07:36 +0200 (IST)
From:	Eli Zaretskii <eliz AT is DOT elta DOT co DOT il>
To:	chojnacki <s709 AT ernie DOT icslab DOT agh DOT edu DOT pl>
cc:	djgpp AT delorie DOT com
Subject:	Re: interrupt 21h in djgpp v1
In-Reply-To:	<199702041427.PAA00604@ernie.icslab.agh.edu.pl>
Message-ID:	<Pine.SUN.3.91.970205145649.2403D-100000@is>
MIME-Version:	1.0

On Tue, 4 Feb 1997, chojnacki wrote:

> go32 version 1.12.maint3 Copyright (C) 1994 DJ Delorie
> Unsupported DOS request at eip=11b2
> eax=00000c00 ebx=7ffffd88 ecx=00000000 edx=00003004 esi=00000000 edi=00000000
> ebp=7ffffd74 esp=7ffffd74 cs=d8 ds=48 es=48 fs=48 gs=38 ss=48 cr2=00003000
> Call frame traceback EIPs:
>   0x000011b2
> 
> I've tried this in djgpp v2 (gcc v2.7.2) and it works fine.
> How should I do this in djgpp v1 ?

You should always use `__dpmi_int' (v2.x) or `_go32_dpmi_simulate_int' 
(v1.x) library function.  Using `int86' or the INT instruction directly 
won't always work.  Whether it works or not depends on the DOS 
extender/DPMI host that you use.  Some extenders, like Windows, catch the 
INT instructions from protected-mode programs and reflect them in real 
mode after a mode switch; others just crash your program (like go32 
did).  Calling the `__dpmi_int' or `_go32_dpmi_simulate_int' will always 
work.

Additional info on this issue can be found in the DJGPP FAQ list 
(v2/faq210b.zip from the same place you get DJGPP), sections 18.1 - 18.3.

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