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Q: What is EXEC CICS structure?
Answer:
EXEC CICS marks CICS commands. EXEC CICS READ FILE('name') INTO(area) RIDFLD(key) END-EXEC. Commands: READ, WRITE, SEND, RECEIVE, LINK, XCTL. RESP and RESP2 capture return codes. Translator converts to CALL.
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Q: What is BMS?
Answer:
BMS (Basic Mapping Support) handles screen I/O. Map defines screen layout. DFHMSD macro creates mapset. SEND MAP displays screen. RECEIVE MAP gets input. Symbolic map in COBOL copybook. Physical map in load library.
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Q: Explain PARM parameter
Answer:
PARM passes data to program. EXEC PGM=PROG,PARM='value'. Max 100 characters. Program receives length prefix. PARM='abc,xyz' passes as one string. Program parses. Special chars need quotes. Alternative: SYSIN for larger data.
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Q: What is LENGTH in commands?
Answer:
LENGTH specifies data size. LENGTH(ws-len). Required for variable data. Set before RECEIVE. Check after READ for actual length. FLENGTH for fullword. Some commands have defaults.
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Q: What is LINKAGE SECTION?
Answer:
LINKAGE SECTION defines parameters received from calling program. Items here have no memory until CALL provides addresses via USING clause. Address established at runtime. Used for both passed parameters and dynamically addressed data.
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Q: What is RECEIVE MAP?
Answer:
EXEC CICS RECEIVE MAP(name) MAPSET(mapset) INTO(symbolic-map). Gets terminal input. Modified fields only (MDT). Check EIBAID for key pressed. MAPFAIL if no data. Symbolic map populated with input.
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Q: How to handle MAPFAIL?
Answer:
MAPFAIL occurs when RECEIVE MAP finds no modified data. Handle: EXEC CICS RECEIVE MAP ... RESP(resp). IF resp = DFHRESP(MAPFAIL). User pressed Enter without typing. May need to redisplay or handle appropriately.
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Q: What is MAPFAIL condition?
Answer:
MAPFAIL when RECEIVE MAP gets no data. Terminal timeout or clear. Handle: check RESP for DFHRESP(MAPFAIL). May need to resend map or handle timeout.
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Q: Explain CICS RECEIVE without MAP
Answer:
RECEIVE INTO without MAP gets raw terminal data. EXEC CICS RECEIVE INTO(area) LENGTH(len). For non-BMS screens. AID in EIBAID. Raw data stream. Lower level than BMS.
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Q: What is CONVERSE?
Answer:
CONVERSE combines SEND and RECEIVE. EXEC CICS CONVERSE FROM(out) INTO(in). One command for both. Simpler for simple screens. Less control than separate commands.
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Q: What is LENGERR?
Answer:
LENGERR is length error. Data too large for area, or length specification wrong. Check LENGTH values. Common on RECEIVE. Ensure adequate receiving field.