Path: utzoo!utgpu!jarvis.csri.toronto.edu!clyde.concordia.ca!uunet!cs.utexas.edu!tut.cis.ohio-state.edu!purdue!haven!udel!eplrx7!leipold
From: leipold@eplrx7.uucp (Walt Leipold)
Newsgroups: comp.sys.mac.programmer
Subject: Shutdown Manager
Summary: How can you tell a Shutdown from a Restart?
Message-ID: <1990Jan16.193431.28545@eplrx7.uucp>
Date: 16 Jan 90 19:34:31 GMT
Sender: usenet@udel.EDU
Reply-To: leipold@eplrx7.UUCP (Walt Leipold)
Organization: E.I.DuPont de Nemours & Co.
Lines: 31

We've developed a product called the 'MacbRISC', a Unix computer on a
NuBus card (features: 40/50/60-MHz Clipper RISC processor, 8/16/32 Mbytes
RAM, built-in Ethernet, 2 SCSI controllers, 2 serial ports, MMU-controlled
mapping of RAM to NuBus, etc).  Although the MacbRISC is a completely
independent co-computer, it *does* share the Mac's power supply.
Unfortunately, the Unix filesystem doesn't like to be unexpectedly powered
down, so we want to discourage the MacbRISC user from shutting down his
Mac (and thus his MacbRISC board) while the MacbRISC's Unix is running.
To do that, I've written an INIT to install a shutdown task which checks
on the Unix status; if Unix is up, a dialog box will ask the user if he'd
rather do a Restart instead of a Shutdown.

The problem: Since my shutdown task must use dialogs and other resources
from its INIT file in the System folder, I've installed it to run before
sdUnMount time.  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).

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?  

-----
"As long as you've lit one candle,                            Walt Leipold
you're allowed to curse the darkness."          (leipolw%esvax@dupont.com)
----
--
The UUCP Mailer