home *** CD-ROM | disk | FTP | other *** search
- Newsgroups: comp.sys.mac.programmer
- Path: sparky!uunet!decwrl!csus.edu!netcom.com!leonardr
- From: leonardr@netcom.com (Leonard Rosenthol)
- Subject: Re: Patching the _Launch Trap
- Message-ID: <abrn6k+.leonardr@netcom.com>
- Date: Tue, 08 Sep 92 06:56:48 GMT
- Organization: Netcom - Online Communication Services (408 241-9760 guest)
- References: <1992Sep8.024049.20121@Arco.COM>
- Lines: 21
-
- In article <1992Sep8.024049.20121@Arco.COM> John Champion <dedjhc@arco.com> writes:
- >Hi all,
- >I'm trying to install a fairly unobtrusive head patch into the _Launch
- >trap. The problem is that no matter what I do, my patch always gets
- >re-patched (presumeably by the system). This unknown code does not pass
- >control down the line like a normal patch would, so my code never gets
- >called.
- >
- Welcome to the wonderful world of "protected patches". This is a
- new trick in System 7 to make sure that programmers don't "screw up" system
- patches. It basically means that it is near impossible to patch such a trap.
-
- If you could post what you are trying to accomplish by patching _Launch
- someone could probably suggest an alternate approach that would be successful.
-
- --
- -----------------------------------------------------------------------------
- Leonard Rosenthol Internet: leonardr@netcom.com
- Director of Advanced Technology AppleLink: MACgician
- Aladdin Systems, Inc. GEnie: MACgician
-
-