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POWER(4) Device Drivers Manual (landisk) POWER(4)

power
power switch

power0 at obio?

Landisk models provide an interrupt when the power switch is flipped to the Off position. The power driver catches that interrupt. If the hw.allowpowerdown sysctl(8) is set to 1, power will signal init(8) to do a clean shutdown.

intro(4), obio(4), init(8), rc.shutdown(8), sysctl(8)

Support for the power driver first appeared in OpenBSD 4.1.
June 24, 2011 OpenBSD-current