Returns the first child of a registry entry in a plane.
- macOS 10.0+
The registry entry whose child to look up.
The name of an existing registry plane. Plane names are defined in IOKitKeys.h, eg. kIOServicePlane.
The first child of the registry entry, on success. The child must be released by the caller.
A kern_return_t error code.
This function will return the child which first attached to a registry entry in a plane.