Right now, only power switch state change events are supported. This
is a work-in-progress.
* Add support to sysmon for delivering power mangement events to userland.
Add poll, kqueue, and read entry points to sysmon.
* Adapt ACPI to use the new generic <sys/power.h> event types.
This provides the kernel support for a forthcoming powerd(8) which can
do nice things like gracefully shut the system down when an ACPI power
button is pressed.
provide some VERY basic support for power/sleep buttons and lid switches;
if someone presses the power button, shut down the system semi-gracefully.
Eventually, we will send events for all types of button/lid events down
to a userland power management daemon, which will be able to define a
separate policy for each button/switch.
kochi