Format of the parameter block (PARMBLOCK)

The parameter block (PARMBLOCK) contains information about the parameters that IRXINIT used to define the environment. The environment block points to the parameter block.

Table 1 shows the format of the parameter block. TSO/E provides a mapping macro, IRXPARMB, for the parameter block. The mapping macro is in SYS1.MACLIB.

The parameter block has the same format as the parameters module. See Characteristics of a Language Processor Environment for information about the parameters module and a complete description of each field.

Table 1. Format of the parameter block (PARMBLOCK)
Offset (decimal)	Number of bytes	Field name	Description
0	8	ID	An eight-character field that identifies the parameter block. The field contains the characters ‘IRXPARMS’.
8	4	VERSION	A 4-byte field that contains the version number of the parameter block in EBCDIC. The version number is 0200.
12	3	LANGUAGE	Language code for REXX messages.
15	1	—	Reserved.
16	4	MODNAMET	Address of the module name table. See Module name table for a description of the table.
20	4	SUBCOMTB	Address of the host command environment table. See Host command environment table for a description of the table.
24	4	PACKTB	Address of the function package table. See Function package table for a description of the table.
28	8	PARSETOK	Token for the PARSE SOURCE instruction.
36	4	FLAGS	A fullword of bits that represent the flags that IRXINIT used in defining the environment. The flags in the parameter block are in the same order as in the parameters module. See Flags and corresponding masks for a complete description of the flags.
40	4	MASKS	A fullword of bits that represent the mask settings of the flag bits that IRXINIT used in defining the environment. The masks are in the same order as in the parameters module. See Flags and corresponding masks for a complete description of the flags and their corresponding masks.
44	4	SUBPOOL	Number of the subpool for storage allocation.
48	8	ADDRSPN	Name of the address space.
56	8	—	The end of the parameter block is indicated by X'FFFFFFFFFFFFFFFF'.