The UPDTB1 information control block is used by UPDS and USERV in order to control access to each reference file. This control block contains information about the file being accessed and the command request being given. The address of this control block is passed to the user-written exit UUPDX1 as the second argument in the parameter list. This table is also described by the UPDTB1 macro. Assemble the sample UUPDX1 to see the layout of this area.
Note:
Fields not expressly noted in the following control block are
reserved.
| Location | Length | Format | Contents | |
|---|---|---|---|---|
| Dec | Hex | |||
| 1608 | 648 | 44 | Character | File name |
| 1652 | 674 | 6 | Character | Volume serial number |
| 1658 | 67A | 1 | Character | VSE sub-library type |
| 1659 | 67B | 2 | Character | Two-character library identification code, or spaces |
| 1667 | 683 | 8 | Character | Member name |
| 1717 | 6B5 | 8 | Character | Printout spool code |
| 1725 | 6BD | 8 | Character | Default destination code |
| 1735 | 6CD | 8 | Character | UPDS/USERV command |
| 1756 | 6DC | 1 | Binary | DSN length, minus 1 |
| 1764 | 6E4 | 1 | Binary 1....... .1...... ..1..... ...1.... ....1... .....1.. |
Flag 1: SYSDSN enqueued SYSIEWLP enqueued UCB allocated Only shared ENQ on SYSDSN UCB permanently resident File is a PDS |
| 1765 | 6E5 | 1 | Binary | Open status: 1 - Open for input 2 - Open for output |
| 1702 | 6A6 | 1 | Binary 1....... .00..... .11..... .01..... ...1.... ....1... .....1.. ......1. .......1 |
Flag 2: Reserved Character display HEX display Interpretive HEX Member entered in command Formattable device Buffer too small for block Position parm with no keyword Reserved |
| 1703 | 6A7 | 1 | Binary 1....... .1...... ..1..... ...1.... |
Flag 3: User data option Y User data option X Reserved User data option T |