diff --git a/scsh/sunos/signals.scm b/scsh/sunos/signals.scm
index ba08aee..b3bf7ae 100644
--- a/scsh/sunos/signals.scm
+++ b/scsh/sunos/signals.scm
@@ -1,7 +1,5 @@
 ;;; Signal constant definitions for Sun4
-;;; Copyright (c) 1994 by Olin Shivers.
-
-;;POSIX only defined here, couldn't find signal.h for Sun4 -dalbertz
+;;; Copyright (c) 1994, 1996 by Olin Shivers and Brian D. Carlstrom
 
 (define-enum-constants signal
   ;; POSIX
@@ -9,14 +7,29 @@
   (int	2)	; interrupt 
   (quit	3)	; quit 
   (ill	4)	; illegal instruction (not reset when caught) 
+  ;; SunOS
+  (trap 5)      ; trace trap (not reset when caught) */
+  ;; POSIX 
   (iot	6)	; IOT instruction 
   (abrt 6)	; used by abort, replace SIGIOT in the future 
+  ;; SunOS
+  (emt  7)      ; EMT instruction
+  ;; POSIX
   (fpe	8)	; floating point exception 
   (kill	9)	; kill (cannot be caught or ignored) 
+  ;; SunOS
+  (bus  10)     ; bus error
+  ;; POSIX
   (segv	11)	; segmentation violation
+  ;; SunOS
+  (sys  12)     ; bad argument to system call
+  ;; POSIX
   (pipe	13)	; write on a pipe with no one to read it 
   (alrm	14)	; alarm clock 
   (term	15)	; software termination signal from kill 
+  ;; SunOS
+  (urg  16)     ; urgent condition on IO channel 
+  ;; POSIX
   (stop	17)	; sendable stop signal not from tty 
   (tstp	18)	; stop signal from tty 
   (cont	19)	; continue a stopped process 
@@ -24,7 +37,21 @@
   (cld	20)	; System V name for SIGCHLD
   (ttin	21)	; to readers pgrp upon background tty read 
   (ttou	22)	; like TTIN for output if (tp->t_local&LTOSTOP) 
+  ;; SunOS
+  (io   23)     ; input/output possible signal 
+  (poll 23)     ; System V name for SIGIO
+  (xcpu 24)     ; exceeded CPU time limit 
+  (xfsz 25)     ; exceeded file size limit
+  (vtalrm 26)   ; virtual time alarm 
+  (prof 27)     ; profiling time alarm
+  (winch 28)    ; window changed 
+  (lost 29)     ; resource lost (eg, record-lock lost) 
+  ;; POSIX
   ;; User defined
   (usr1 30)	; user defined signal 1 
   (usr2 31)	; user defined signal 2 
   )
+
+(define signals-ignored-by-default
+  (list signal/chld signal/cont                         ; These are Posix.
+	signal/urg signal/io signal/winch)              ; These are SunOS.