Parameter descriptions

The following REXX exits do not receive parameter lists:

For IRXITTS (TSO/E) and IRXITMV (non-TSO/E):
Register 0 contains the address of the new environment block. Register 1 does not point to a parameter list.
For IRXTERMX:
Register 0 contains the address of the terminating environment block. Register 1 does not point to a parameter list.
For exec initialization and exec termination:
Register 0 contains the address of the current environment block. Register 1 does not point to a parameter list.
For attention handling:
Register 0 contains the address of the current environment block. Register 1 does not point to a parameter list.

The environment block pointed to by register 0 contains a field (ENVBLOCK_ATTNROUT_PARMPTR) that contains the address of an attention handling routine control block. The attention handling exit can use this control block to communicate with REXX attention processing. For more information on the format of the attention handling routine control block, see Table 1.

The IRXINITX pre-environment initialization exit and the exec processing exit (exit for IRXEXEC) receive non-standard parameter lists. They are described in the following sections.