UPDTB1 Information Control Block

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# UPDTB1 Information Control Block

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