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IGZERRE Entry Conditions and Return Codes

Mainframe Access uses the IBM utility module IGZERRE to set up the COBOL environment when working with Mainframe Call Generator.

On entry to IGZERRE, the following register contents must exist:

Register Contents
1 If initializing, a function code of 1.

If terminating, a function code of 2

If parm list form, the address of a pointer to a word containing the function code as above.

13 Pointer to standard register save area.
14 Return address.
15 IGZERRE's entry address.

On return, register 15 contains one of the following return codes:

Return Code Explanation
0 Function completed successfully.
4 COBOL already initialized. This code can only be returned following the use of the initialization function.
8 Invalid function code in register 1 or parameter list . The function code must be 1 or 2.
12 ILBOSTP0 not part of load module. This code can only be returned following the initialization of NORES.
16 COBOL was not previously initialized. This code can only be returned following the use of the termination function.
20 20 COBTEST is being used. This code can only be returned following the termination of RES.

The originally requested function is performed only when the return code is 0.

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