Date: Wed, 22 Jan 1997 00:18:50 -0800 (PST)
From: Gene Buckle <geneb AT web DOT wa DOT net>
To: Eli Zaretskii <eliz AT is DOT elta DOT co DOT il>
cc: djgpp AT delorie DOT com
Subject: Re: Passing a parameter to interrupt handler.
In-Reply-To: <Pine.SUN.3.91.970122085048.29370J-100000@is>
Message-ID: <Pine.LNX.3.93.970122001709.8019B-100000@web.wa.net>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII

> > 
> > The whole program is locked in memory via the CRT0 flags.  My problem is
> > that the program calling the interrupt (0xef in this case) won't be the
> > same one that has the code for the actual ISR in it. ;)
> 
> Allocate some DOS memory and pass the data through that buffer.  You will 
> have to devise a mechanism to publish the address of that buffer, so the 
> program which allocated them could tell the address to the other programs.
> One possibility to pass this address is an environment variable; another 
> is a disk file.
> 

The allocation of DOS memory would be the way to go.  This handler is
going to be hit hundreds (if not thousands) of times per second.  A disk
file would make it equal to Win95 in performance. ;)

Any clues as to how I can make the dos buffer address known to both
programs?

g.