From:	"Charles Sandmann" <sandmann AT clio DOT rice DOT edu>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: DPMI identification
Date:	Tue, 12 Oct 1999 11:09:00
Organization:	Aspen Technology, Inc.
Lines:	26
Message-ID:	<380316cc.sandmann@clio.rice.edu>
References:	<380327DC DOT A134803D AT ma DOT tum DOT de>
NNTP-Posting-Host:	dcloan.aco.aspentech.com
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To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp
Reply-To:	djgpp AT delorie DOT com

> is there a way to find out which DPMI server is actually serving a
> running DJGPP program?  I think of a code fragment like
> 
> i=_dpmi_whtsoever(); //or i=go32_whatsoever();
> switch( i){
>  case A: CWSDPMI...
>  case B: Win9x...
>  case C: YA_DPMI
>  default: DONT_KNOW....
> }
> or any other solution would be fine. thanks.
> --
>  Gruss Waldemar Schultz.

You would need to write one.  Since DPMI is supposed to be a "standard", you
have to dig a bit to tell the differences.

Things I can think of which would give hints:
  Which DPMI calls are supported (Get page attributes is a good one to test)
  What DPMI version is reported
  The current IOPL, and the GDT information

Ideally you should check for features instead of a specific DPMI provider.
The only real use I know of looking for a specific DPMI is to bypass it's
protection and go to ring 0 or collect special information not normally 
available (like the page tables, and thus physical memory info).

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