(* FreeBSD 9.0 /usr/include/sys/signal.h *)
				si_signo*: int; (* signal number *)
				si_errno*: int; (* errno association *)
				si_code*: int; (* signal code *)
				si_pid*: pid_t; (* sending process *)
				si_uid*: uid_t; (* sender's ruid *)
				si_status*: int; (* exit value *)
				si_addr*: PtrVoid; (* faulting instruction *)
(*
				si_value*: sigval; (* signal value *)
*)
				si_value*: PtrVoid;
				_reason*: RECORD [union]
					_fault*: RECORD [untagged]
						_trapno*: int; (* machine specific trap code *)
					END;
					_timer*: RECORD [untagged]
						_timerid*: int;
						_overrun*: int;
					END;
					_mesgq*: RECORD [untagged]
						_mqd*: int;
					END;
					_poll*: RECORD [untagged]
						_band*: long; (* band event for SIGPOLL *)
					END;
					__spare__: RECORD [untagged]
						__spare1__: long;
						__spare2__: ARRAY [untagged] 7 OF int;
					END;
				END;