Typedefs starting with `r' in osfmk/kern

• ReturnHandler osfmk/kern/thread_act.h:113
• Rpc_Control osfmk/kern/rpc_remote.h:118
• rpc_control_t osfmk/kern/rpc_remote.h:129
• rpc_kkt_args_t osfmk/kern/rpc_remote.h:213
• Rpc_Service osfmk/kern/rpc_remote.h:127
• rpc_service_t osfmk/kern/rpc_remote.h:130
• run_queue_t osfmk/kern/sched.h:122