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Date: Mon, 22 Jun 2015 10:50:32 +0300
Message-ID: <CAA2C=vCOrPG=5cSvFn89aqy-1BDu=3TGbVbxXovhrMrTH29RiQ@mail.gmail.com>
Subject: Re: Detecting Windows NT in DJGPP
From: "Ozkan Sezer (sezeroz AT gmail DOT com)" <djgpp AT delorie DOT com>
To: djgpp AT delorie DOT com
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On 6/22/15, Frank Sapone (emoaddict15 AT gmail DOT com) <djgpp AT delorie DOT com> wrote:
> Hey everyone,
>
> Quake 1 has a rather simple test for detecting if it's being run on
> Windows 9x:
>
>      __dpmi_regs                             r;
>
>      r.x.ax = 0x160a;                /* Get Windows Version */
>      __dpmi_int(0x2f, &r);
>
>      if(r.x.ax || r.h.bh < 4)        /* Not windows or earlier than Win95
> */
>          <code>
>      else
>          <code>
>
> I'd like to detect if the program is running in NTVDM/Win XP/etc.  I
> know you can check for WINDIR as an evironment string, but that could be
> unreliable
> from someone with a bad autoexec.bat.
>
> Is there any other way to detect if it's in an NT environment?
>
> Frank

The allegro library (allegro-4.2.3.1, http://alleg.sourceforge.net/)
has a detect_os() procedure in its src/dos/dsystem.c. Its NT detection
is based on environment variable check, though, along with a call to
_get_dos_version().

--
O.S.