Inside Macintosh: Devices /

Chapter 6 - Power Manager / Power Manager Reference

Power Manager Dispatch Routines / Determining the Power Manager Features Available

PMSelectorCount

You can use the PMSelectorCount function to determine which Power Manager dispatch functions are implemented.

short PMSelectorCount();

DESCRIPTION

The PMSelectorCount function returns the number of routine selectors present. Any function whose selector value is greater than the returned value is not implemented.

ASSEMBLY-LANGUAGE INFORMATION

The trap is _PowerMgrDispatch ($A09E). The selector value for PMSelectorCount is 0 ($00) in the low word of register D0. The number of selectors is returned in the low word of register D0.