Legacy Document

Inside Macintosh: Processes

Chapter 8 - Shutdown Manager / Shutdown Manager Reference

Shutdown Manager Routines / Shutting Down or Restarting a Macintosh Computer

ShutDwnPower

The system software calls the ShutDwnPower procedure to shut down a Macintosh computer.

PROCEDURE ShutDwnPower;

DESCRIPTION

The ShutDwnPower procedure initiates the final stage of the system shutdown process. It performs system housekeeping, executes any custom shutdown procedures installed by calls to ShutDwnInstall, and, if possible, turns the computer off. (The Shutdown Manager displays the Shutdown alert box if the user has to turn the computer off manually.) The system housekeeping functions consist of a five-step process, described in full in "The Shutdown Process" on page 8-4.

You should always call ShutDwnPower indirectly, through the Finder, to give any other applications running at the time a chance to exit gracefully. "Sending a Shutdown or Restart Event" on page 8-7 describes the correct way to shut down a Macintosh computer.

ASSEMBLY-LANGUAGE INFORMATION

The trap macro and routine selector for the ShutDwnPower procedure are

Trap macro	Selector
_Shutdown	$0001