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Using Compaq COBOL in the Alpha Common Language Environment
13.5 Establishing and Removing User Condition Handlers (OpenVMS)
To run this example program:
$ COBOL SSCOND
$ LINK SSCOND
$ RUN SSCOND
System service call failed with error:
%SYSTEM-F-IVCHAN, invalid I/O channel
%SYSTEM-F-SSFAIL, system service failure exception, status=0000013C,
PC=8005FA40, PS=0000001B
%TRACE-F-TRACEBACK, symbolic stack dump follows
Image Name Module Name Routine Name Line Number rel PC abs PC
0 8005FA40 8005FA40
SSCOND SSCOND SSCOND 21 000000CC 000300CC
SSCOND 0 00020470 00030470
0 870C8170 870C8170
0 849708F0 849708F0
For more information about condition handling, including LIB$ESTABLISH and
LIB$REVERT, refer to OpenVMS RTL Library (LIB$) Manual. ♦
13.6 Examples (OpenVMS)
This section provides examples that demonstrate how to call system routines
from COBOL programs.
Example 13–2 shows a procedure call and gives a sample run of the program
RUNTIME. It calls MTH$RANDOM, a random number generator from the Run-
Time Library, and generates 10 random numbers. To obtain different random
sequences on separate runs, change the value of data item SEED for each run.
Example 13–2 Random Number Generator (OpenVMS)
IDENTIFICATION DIVISION.
PROGRAM-ID. RUNTIME.
*****************************************************
* This program calls MTH$RANDOM, a random number *
* generator from the Run-Time Library. *
*****************************************************
DATA DIVISION.
WORKING-STORAGE SECTION.
01 SEED PIC 9(5) COMP VALUE 967.
01 A-NUM COMP-1.
01 C-NUM PIC Z(5).
PROCEDURE DIVISION.
GET-RANDOM-NO.
PERFORM 10 TIMES
CALL "MTH$RANDOM" USING SEED GIVING A-NUM
MULTIPLY A-NUM BY 100 GIVING C-NUM
DISPLAY "Random Number is " C-NUM
END-PERFORM.
Example 13–3 shows a program fragment that calls the SYS$SETDDIR system
service.
Example 13–4 calls the System Service routine $ASCTIM.
Using Compaq COBOL in the Alpha Common Language Environment 13–19