Read-Only Variables Parameter List (IGDACERO)

Table 1 shows the parameter list for the read-only variables that is mapped by the IGDACERO macro. For additional information about read-only variables, see z/OS DFSMSdfp Storage Administration.

Table 1. Read-Only Variables (IGDACERO)
Offset	Length or Value	Name	Description
0 (X'0')	1524	ACERO	Read-only variables parameter list
0 (X'0')	8	ACEROID	Control block ID contains the value "ACERO"
8 (X'8')	2	ACEROLEN	Length of control block
10 (X'A')	2	ACEROVER	Control block version number
	0	ACEROV	Version 0
12 (X'C')	4	ACEROSIZ	Primary or actual size of data set in KB
16 (X'10')	4	ACEROMSZ	Maximum size of data set in KB
20 (X'14')	8	ACEROUNT	Unit name (character)
28 (X'1C')	8	ACEROMVG	MSS volume group name (character)
36 (X'24')	8	ACEROAPP	Application ID (RACF) (character)
44 (X'2C')	8	ACERODSO	Data set owner (RACF) (character)
52 (X'34')	8	ACEROUSR	User (RACF) (character)
60 (X'3C')	8	ACEROGRP	Group (RACF) (character)
68 (X'44')	4	ACERODSG	Data set organization (unsigned binary). Can be one of the following:
	0	ACERONUL	Null
	1	ACEROPS	PS-physical sequential
	2	ACEROPO	PO-Partitioned
	3	ACEROVS	VS-/VSAM Organization
	4	ACERODA	DA-Direct Organization (BDAM)
	5	ACEROEXC	Extended Data Format, preferred
	6	ACEROEXR	Extended Data Format, required
72 (X'48')	4	ACERORCG	Record organization. Can be one of the following:
	0	ACERONUL
	1	ACEROKS	VSAM key-sequenced data set
	2	ACEROES	VSAM entry-sequenced data set
	3	ACERORR	VSAM Relative-record data set
	4	ACEROLS	VSAM linear data set
76 (X'4C')	4	ACERODST	Data Set Type. Can be one of the following:
	0	ACERONUL	Null
	1	ACEROGDS	One generation data set of a generation data group
	2	ACEROPRM	Standard permanent data sets
	3	ACEROTMP	Temporary data sets
80 (X'50')	4	ACEROXMD	Execution mode. Can be one of the following:
	0	ACERONUL	Null
	1	ACEROBCH	Batch execution mode
	2	ACEROTSO	TSO execution mode
	3	ACEROTSK	Started task
84 (X'54')	8	ACEROJOB	Job name
92 (X'5C')	8	ACERODD	Ddname
100 (X'64')	8	ACEROPGM	Program name
108 (X'6C')	4	ACEROEXP	Expiration date (YYYYDDDF) in packed decimal
112 (X'70')	4	ACERORTP	Retention period days (binary)
116 (X'74')	1		Reserved
117 (X'75')	3	ACERODIR	Directory blocks from JCL
244 (X'F4')	8	ACEROENV	Environment. One of the following values or you can set your own in the exit. (Values are padded on the right with blanks).
	STORE	ACEROSTE	OSMI store environment
	CHANGE	ACEROCHE	OSMI change environment
	CTRANS	ACEROCTE	OSMC class transition environment
	RECALL	ACERORCL	Data set recall operations
	RECOVER	ACERORCV	Data set recover operations
	CONVERT	ACEROCNV	Data set convert in place operations
	ALLOC	ACEROALC	New data set allocations (default)
	ALLOCTST	ACEROTST	New data set allocations in the ACS Allocation Test environment
252 (X'FC')	32	ACERODDC	Default data class (from RACF)
252 (X'FC')	2	ACERODDL	Length of the default data class name
254 (X'FE')	30	ACERODDV	Name of the default data class
284 (X'11C')	32	ACERODSC	Default storage class (from RACF)
284 (X'11C')	2	ACERODSL	Length of the default storage class name
286 (X'11E')	30	ACERODSV	Name of the default storage class
316 (X'13C')	32	ACERODMC	Default management class (from RACF)
316 (X'13C')	2	ACERODML	Length of the default management class name
318 (X'13E')	30	ACERODMV	Name of the default management class
348 (X'15C')	80		Reserved
428 (X'1AC')	32	ACERODC	Data class input only. Output returned in IGDACERW.
428 (X'1AC')	2	ACERODCL	Length of DATACLAS variable
430 (X'1AE')	30	ACERODCV	Value of DATACLAS variable
460 (X'1CC')	32	ACEROSC	Storage class input only. Output returned in IGDACERW.
460 (X'1CC')	2	ACEROSCL	Length of STORCLAS variable
462 (X'1CE')	30	ACEROSCV	Value of STORCLAS variable
492 (X'1EC')	32	ACEROMC	Management class input only. Output returned in IGDACERW.
492 (X'1EC')	2	ACEROMCL	Length of MGMTCLAS variable
494 (X'1EE')	30	ACEROMCV	Value of MGMTCLAS variable
524 (X'20C')	44	ACERODSN	Data set name
568 (X'238')	8	ACEROGEN	Generation number
576 (X'240')	4	ACERODNT	Data Set name type. Can be one of the following:
	0	ACERONUL
	1	ACEROLIB	LIBRARY (PDSE)
	2	ACEROPDS	PDS (partitioned data set)
	3	ACEROHFS	HFS (hierarchical file system date set)
	4	ACEROPIP	PIPE (pipe)
	5	ACEROEXR	EXR (Extended format required)
	6	ACEROEXC	EXC (Extended format preferred)
	7	ACEROBAS	BASIC (not extended or large format)
	8	ACEROLRG	LARGE (large format sequential data set)
580 (X'244')	257	ACEROJAC	Job account information
580 (X'244')	1	ACEROJNM	Number of fields in the account data
581 (X'245')	256	ACEROJFL	Job account data. Each field contains the length of the field followed by data.
837 (X'345')	7		Reserved
844 (X'34C')	257	ACEROSAC	Step account information
844 (X'34C')	1	ACEROSNM	Number of fields in the account data
845 (X'34D')	256	ACEROSFL	Step account data. Each field contains the length of the field followed by data.
1101 (X'44D')	7		Reserved
1108 (X'454')	2	ACERONVL	Number of volume serial numbers (up to 59)
1110 (X'456')	6	ACEROVOL	Array of volume serial numbers (up to 59)
1464 (X'5B8')	8		Reserved
1472 (X'5C0')	44	ACEROMEM	Member name
1516 (X'5EC')	44	ACEROCDS	Name of model data set for cluster
1560 (X'44')	44	ACEROIDS	Name of model data set for index
1604 (X'644')	44	ACERODDS	Name of model data set for data
1648 (X'670')	4	ACEROFNO	Tape file sequence number
1652 (X'674')	4	ACEROLBL	Tape label type. Possible values are:
	1	ACERONL	Unlabeled
	2	ACEROSL	IBM standard
	3	ACEROAL	ISO/ANSI standard
	4	ACERONSL	Non-standard
	5	ACEROSUL	IBM standard user
	6	ACEROAUL	ISO/ANSI standard user
	7	ACEROBLP	Bypass label processing
	8	ACEROLTM	Leading tape mark (unlabeled)
1656 (X'678')	8	ACEROTLB	Tape library name
1664 (X'680')	8		Reserved
1672 (X'688')	2	ACEROPOL	Length of pool name (ACEROPOV).
1674 (X'68A')	30	ACEROPOV	Tape pool name — allows your tape management system to pass a tape pool name to the ACS routine.
1704 (X'6A8')	44	ACEROMSD	Follows the rules for TSO data set names although each qualifier is a tape management destination.
1748 (X'6D4')	8	ACEROPCY	Single variable, ISPF naming convention
1756 (X'6DC')	1	ACEROMFN	Number of fields in ACEROMFL
1757 (X'6DD')	256	ACEROMFL	Multi-field variable in external user exit routine — repetitive fields of 1 byte length field in one byte hexadecimal followed by value of the field in character text. (for example: X'05'"value"X'02')
2013 (X'7DD')	15		Reserved