Added a .db file with a single record $(IOC):exit.

Set the .A field to the exit status you want the softIoc to return.

src/softIoc/Makefile

@@ -26,4 +26,6 @@ softIoc_SRCS += softMain.cpp
 
 softIoc_LIBS = $(EPICS_BASE_IOC_LIBS)
 
+DB += softIocExit.db
+
 include $(TOP)/configure/RULES

src/softIoc/softIocExit.db

@@ -0,0 +1,7 @@
+# $Id$
+#
+record(sub,"$(IOC):exit") {
+	field(DESC,"Exit subroutine")
+	field(SCAN,"Passive")
+	field(SNAM,"exit")
+}