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Using Compaq COBOL in the Alpha Common Language Environment
13.5 Establishing and Removing User Condition Handlers (OpenVMS)
Example 13–1 (Cont.) User-Written Condition Handler
WORKING-STORAGE SECTION.
01 SS_HAND PIC S9(9) COMP.
01 SS$_SSFAIL PIC S9(9) COMP VALUE EXTERNAL SS$_SSFAIL.
01 SS$_RESIGNAL PIC S9(9) COMP VALUE EXTERNAL SS$_RESIGNAL.
01 MSGLEN PIC S9(4) COMP.
01 MSGID PIC S9(9) COMP.
01 ERRMSG PIC X(80).
01 STAT PIC S9(9) COMP.
LINKAGE SECTION.
01 SIGNAL_ARRAY.
03 SIGNAL_ARGS PIC 9(9) COMP.
03 SIGNAL OCCURS 4 TO 10 TIMES
DEPENDING ON SIGNAL_ARGS.
05 SIGNAL_VALUE PIC S9(9) COMP.
01 MECHANISM_ARRAY.
03 MECH_ARGS OCCURS 5 TIMES.
05 MECH PIC 9(9) COMP.
PROCEDURE DIVISION USING SIGNAL_ARRAY MECHANISM_ARRAY
GIVING SS_HAND.
BEGIN.
*
* Initialize the return result
*
MOVE SS$_RESIGNAL TO SS_HAND.
IF SIGNAL_VALUE(1) NOT EQUAL SS$_SSFAIL
THEN
MOVE SS$_RESIGNAL TO SS_HAND
ELSE
*
* Disable system service failure mode
*
CALL "SYS$SETSFM" USING BY VALUE 0
MOVE SIGNAL(2) TO MSGID
CALL "SYS$GETMSG" USING BY VALUE MSGID
BY REFERENCE MSGLEN
BY DESCRIPTOR ERRMSG
BY VALUE 0 0
GIVING STAT
IF STAT IS FAILURE
THEN
CALL "LIB$STOP" USING BY VALUE STAT
END-IF
DISPLAY "System service call failed with error:"
DISPLAY ERRMSG(1:MSGLEN)
*
* This is where the handler would perform
* corrective measures
*.
*.
*.
* MOVE SS$_CONTINUE TO SS_HAND
*
END-IF.
EXIT PROGRAM.
END PROGRAM SSHAND.
13–18 Using Compaq COBOL in the Alpha Common Language Environment