Function RtmRegisterEntity 

pub unsafe extern "system" fn RtmRegisterEntity(
    rtmentityinfo: *mut RTM_ENTITY_INFO,
    exportmethods: *mut RTM_ENTITY_EXPORT_METHODS,
    eventcallback: RTM_EVENT_CALLBACK,
    reserveopaquepointer: BOOL,
    rtmregprofile: *mut RTM_REGN_PROFILE,
    rtmreghandle: *mut isize,
) -> u32