CICS provides system related information to each task in the form of Exec interface block. Since the information is automatically provided by CICS the application program can use it straightaway.
When CICS translator translates your program, it adds DFHEIBLK copybook as the first entry in your linkage section. Whenever a task is initiated, the task related information could be accessed using the fields in the copybook. EIB is acronym for Executive Interface Block.
DFHEIBLK is similar as SQLCA. but Unlike SQLCA, Execute Interface Block (EIB) is loaded automatically by the CICS for every program while compiling.
Some of the most commonly used EIB information are,
| EIB Field | PIC Clause | Description |
|---|---|---|
| EIBAID | X(1) | Value of last Attention identifier key pressed |
| EIBCALEN | S9(4) COMP | Length of DFHCOMM AREA |
| EIBDATE | S9(4) COMP-3 | Date when this task is initiated |
| EIBFN | X(2) | Function code of the last CICS command in HEX |
| EIBRCODE | X(6) | Code of the last function |
| EIBTASKN | S9(7) COMP-3 | Task Number of the Current Task |
| EIBTIME | S9(7) COMP-3 | Time when the Current Task was started |
| EIBTRMID | X(4) | Terminal-ID from where task initiated |
| EIBTRNID | X(4) | Transaction-id of Current Task |
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