Register contents when Exit 34 gets control

The contents of the registers on entry to this exit are:

Register

Contents

0

1

Pointer to a 24-byte parameter list with the following structure:

Byte 1 (+0)

Type of data set indicator

0: Internal reader
4: JESNEWS data set
8: SYSIN data set
12: SYSOUT data set
16: PROCESS SYSOUT or SYSOUT application program interface (SAPI) data set
20: SPOOL BROWSE data set
24: Unknown data set type

Byte 2 (+1)

Condition byte

bits 0-5: These bits are not part of the interface
bit 6: 0 – no error occurred during allocation processing
: 1 – error occurred during allocation processing
bit 7: 0 – no error occurred during unallocation processing
: 1 – error occurred during unallocation processing

Byte 3 (+2)

This byte is not part of the interface

Byte 4 (+3)

This byte is not part of the interface

Byte 5 (+4)

This byte is

Address of IRWD - if data set type is internal reader (byte 1 = 0)
Address of SDB - if data set type is SYSIN, SYSOUT, PROCESS SYSOUT, or SPOOL BROWSE data set (byte 1 = 8, 12, 16, or 20)
0- if unknown data set type (byte 1 = 24)

Byte 9 (+8)

Address of SJB or 0. This value is 0:

If error in obtaining SJB address,
If data set is a started task or TSO/E internal reader, or
When the automatic restart manager unallocates an internal reader.

Byte 13 (+12)

Address of JFCB

Byte 17 (+16)

Address of PDDB

0 – if data set type is a regular internal reader, an unknown data set type (byte 1 = 0 or 24), or if the PSO unallocation was performed after the JOB–step TCB ended.

Byte 21 (+20)

Address of IOT

0 – if data set type is a regular internal reader or unknown data set type (byte 1 = 0 or 24)

2-10

N/A

11

Address of HCCT

12

N/A

13

Address of an available save area

14

The return address

15

The entry address