Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: utzoo!mnetor!seismo!rutgers!ames!amdcad!decwrl!sqm.dec.com!jmsynge
From: jmsynge@sqm.dec.com (James M Synge, DTN 381-1545)
Newsgroups: comp.sys.amiga
Subject: Re: Dos library/SetFunction() question
Message-ID: <9792@decwrl.DEC.COM>
Date: Sat, 9-May-87 17:44:39 EDT
Article-I.D.: decwrl.9792
Posted: Sat May  9 17:44:39 1987
Date-Received: Sun, 10-May-87 06:05:17 EDT
Sender: daemon@decwrl.DEC.COM
Organization: Digital Equipment Corporation
Lines: 26

inria!rouaix writes:

> BUT: for dos.library the vector table looks like:
> 	MOVEQ #x,d0
> 	BRA entry_point
> 	(repeated)
> where the code at entry_point is doing some standard stack manipulations,
> and then computes some address from x and goes to it.
> My question is: how can you use SetFunction on dos.library ??

SetFunction can NOT be used on dos.library!  If you wish to do this, you
need to determine the address to which the BRA jumps to, record this, then
insert your own JMP YOUR_ROUTINE in the jump table (not just the address
as does SetFunction), set the appropriate flag in the Library lib_Flags field,
then set your routine so it prepares D0 correctly and JMPs to the location
which you determined earlier.

Bon chance,

James Synge

USENET:  {decvax, ucbvax, allegra}!decwrl!sqm.dec.com!jmsynge
ARPAnet: jmsynge%sqm.DEC@decwrl.DEC.COM

#include <disclaimer.h>
"Ken Olsen can speak for Digital, not me!"