The caller acknowledges notification of a power state change on a device it has registered for notifications for via IORegisterForSystemPower or IORegisterApp.
- macOS 10.0+
- Mac Catalyst 13.0+Beta
Port used to communicate to the kernel, from IORegisterApp or IORegisterForSystemPower.
A copy of the notification ID which came as part of the power state change notification being acknowledged.
Returns kIOReturnSuccess or an error condition if request failed.
Must be used when handling kIOMessageCanSystemSleep and kIOMessageSystemWillSleep messages from IOPMrootDomain system power. The caller should not call IOAllowPowerChange in response to any messages except for these two.
Disconnects the caller from an IOService after receiving power state change notifications from the IOService. (Caller must also release IORegisterApp's return io_connect_t and returned IONotificationPortRef for complete clean-up).
Disconnects the caller from the Root Power Domain IOService after receiving system power state change notifications. (Caller must also destroy the IONotificationPortRef returned from IORegisterForSystemPower.)
Connects the caller to an IOService for the purpose of receiving power state change notifications for the device controlled by the IOService.
Connects the caller to the Root Power Domain IOService for the purpose of receiving sleep & wake notifications for the system. Does not provide system shutdown and restart notifications.
This documentation contains preliminary information about an API or technology in development. This information is subject to change, and software implemented according to this documentation should be tested with final operating system software.Learn more about using Apple's beta software