Xref:	news2.mv.net comp.os.msdos.djgpp:2036
From:	Robert Hoehne <Robert DOT Hoehne AT Mathematik DOT tu-chemnitz DOT de>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: Hooking interrupts
Date:	Thu, 21 Mar 1996 16:25:35 +0100
Organization:	TU Chemnitz-Zwickau
Lines:	27
Message-ID:	<315174EF.74C8@Mathematik.tu-chemnitz.de>
References:	<A2B885755D AT fs2 DOT mt DOT umist DOT ac DOT uk>
NNTP-Posting-Host:	tantalus-e.hrz.tu-chemnitz.de
Mime-Version:	1.0
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

A.Appleyard wrote:
> 
> In djgpp, IS there an easy way of hooking an interrupt? If I wrote a
> function:-
> 
I think, this isn't easy. I have done this in my IDE (called RHIDE).

Look at the source code for this, found in

http://www.tu-chemnitz.de/~rho/rhide/rhides.zip

and see the file ide21.cc. There I have done my hook (mostly in
assembler). This code redirects read/write/open/close calls for
some files with my own code. But this isn't very stable now.

Hope this helps in understanding the difficulties in hooking
the int 0x21.

Robert

-- 
*****************************************************************
* Robert Hoehne, Fakultaet fuer Mathematik, TU-Chemnitz-Zwickau *
* Post:    Am Berg 3, D-09573 Dittmannsdorf                     *
* e-Mail:  Robert DOT Hoehne AT Mathematik DOT TU-Chemnitz DOT DE              *
* WWW:     http://www.tu-chemnitz.de/~rho                       *
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