Path: utzoo!attcan!uunet!unisoft!hoptoad!tim
From: tim@hoptoad.uucp (Tim Maroney)
Newsgroups: comp.sys.mac.programmer
Subject: Re: Multifinder: how do I patch GetNextEvent?
Message-ID: <5677@hoptoad.uucp>
Date: 17 Oct 88 21:44:11 GMT
References: <747@ttrdf.UUCP> <10050025@eecs.nwu.edu> <2456@spray.CalComp.COM> <7374@well.UUCP> <5654@hoptoad.uucp> <18914@apple.Apple.COM>
Reply-To: tim@hoptoad.UUCP (Tim Maroney)
Organization: Eclectic Software, San Francisco
Lines: 18

Thanks to Larry Rosenstein for his speedy and clear answer.  (And while I'm
at it, kudos to Apple employees in general for their greatly improved net
support of late!  It used to be that we could count on getting an answer
which was at best curt and often outright rude; now we're practically
guaranteed of a quick, clear, polite answer!)

It seems that what you're saying is that the only safe kind of patch is
one that does its stuff, clears the stack back to the return address, and
then does a JMP.L to the old trap.  Ick.  Most trap patching applications
I've seen or speculated on just can't be done that way.  Could we at least
get a list of "where-from" traps to make things a little less awful?
-- 
Tim Maroney, Consultant, Eclectic Software, sun!hoptoad!tim
"The Diabolonian position is new to the London playgoer of today, but not to
 lovers of serious literature.  From Prometheus to the Wagnerian Siegfried,
 some enemy of the gods, unterrified champion of those oppressed by them, has
 always towered among the heroes of the loftiest poetry."
    - Shaw, "On Diabolonian Ethics"