Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!cornell!uw-beaver!zephyr.ens.tek.com!tektronix!reed!chaffee
From: chaffee@reed.UUCP (Alex Chaffee)
Newsgroups: comp.sys.mac.programmer
Subject: Re: Shutdown Manager
Message-ID: <13905@reed.UUCP>
Date: 19 Jan 90 23:07:38 GMT
References: <1990Jan16.193431.28545@eplrx7.uucp> <1409@smurf.ira.uka.de>
Reply-To: chaffee@reed.UUCP (Alex Chaffee)
Organization: Reed College, Portland OR
Lines: 38

In article <1409@smurf.ira.uka.de> urlichs@smurf.ira.uka.de (Matthias Urlichs) writes:
<In comp.sys.mac.programmer leipold@eplrx7.UUCP (Walt Leipold) writes:
<< However, IM V doesn't tell me how a shutdown task can
<< determine whether it was invoked via a "Shutdown" or a "Restart" from
<>< Finder/Multifinder (right now, the stupid dialog appears for every Restart
<>< as well as every Shutdown).
<>< 
<>Install something with sdOnUnmount to load the resources, stash their handles
,>somewhere, and another procedure with sdOnPowerOff to execute the code.
<>However, see below...
<>
<>< I suppose I can patch the Shutdown trap and work my magic before any
<>< Shutdown tasks are run, but the mere existence of the Shutdown Manager
<>< makes me reluctant to reinvent the (possibly incompatible) wheel.  So,
<>< does anybody out there have any idea how my shutdown task can determine
<>< what kind of shutdown/restart it was called during?  
<>< 
<>Patch Shutdown.

I'm not intimately familiar with the Shutdown manager, but I have patched a
few traps in my time.  I offer the following suggestion:  Patch Shutdown,
but since you're worried about compatibility, just have that patch set a
flag somewhere that your real shutdown routine can see it.  Then proceed
legally and cleanly to _Shutdown...  Presumably, your sdUnmount (or
sdPowerOff) routine will get called at the right time, look at the flag, and
if it's been set, put up the dialog box.  Does anyone see a problem with
this?  Or is it redundant?

                "So we stole a painting.  So we turned a policeman into a
                 toilet.  Worse things happen every day in El Salvador."
			- Grant Morrison, Doom Patrol #29


-- 
Alex Chaffee
chaffee@reed.UUCP
Reed College, Portland OR 97202
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