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File No. S360-20
Order No. GC28-6550-ll OS




Systems Reference Library




OS Data Management for System Programmers

Release 21


This publication consists of self-contained
~hapters, each of which provides information on
how to modify, extend, or implement the data
management capabilities of the IBM System/360
Operating System control program. It is
designed primarily for system programmers
responsible for maintaining, updating, and
extending the operating system features.

Topics:

Catalog and VTOC Maintenance
IECDSEC'l', IEFJFCBN, and IE.FUCBOB Macro
Instructions
The EXCE Macro Instruction
The XDAP Macro Instruction
Implementing Data Set Protection
Adding a UCS Image to the system Library
Twelfth Edition (April 1973)

This edition replaces the previous edition (numbered GC28-6550-10) and its technical
newsletter (numbered GN26-0750) and makes them both obsolete.

This edition applies to release 21. 7 and to all subsequent releases unless otherwise
indicated in new editions or technical newsletters.

Significant changes are summarized under "Summary of Amendments" following the
list of illustrations. Each technical change is marked by a vertical line to the left of
the changed area.

Information in this publication is subject to significant change. Any such changes will
be published in new editions or technical newsletters. Before using the publication,
consult the latest IBM System/360 and System/370 Bibliography, GA22-6822, and the
technical newsletters that amend that bibliography, to learn which editions and
technical newsletters are applicable and current.

Requests for copies of IBM publications should be made to the IBM branch office that
serves you.

Forms for reader's comments are provided in the back of this pUblication. If the forms
have been removed, comments may be addressed to IBM Corporation, Programming
Center-Publishing, Department D58, Monterey and Cottle Roads, San Jose, California
95193. All comments become the property oflBM.

@) Copyright International Business Machines Corporation 1966, 1967,1968, 1969, 1970,
1971, 1972, 1973
Preface


This publication consists of self-contained
chapters, each of which provides system
programmers with information on how to
modify, extend, or implement the data
management capabilities of the IBM
system/360 Operating System control
program. Although the information in one
chapter is sometimes related to information
in another, all chapters have been written
as separate and complete units. It is
assumed that users of this publication are
thoroughly familiar with the d~ign of the
operating system and its features. such
information can be obtained in IBM
system/360 Operating system: Introduction,
GC28-6534. Each chapter contains its own
introductory section and list of
prerequisite publications. This
organization has been used to reduce
cross-referencing.




Preface 3
Contents



I SUMMARY OF AMENDMENTS FOR GC28-6550-11 OS RELEASE 21. 7 9
SUMMARY OF AMENDMENTS FOR GC28-6550-10 OS RELEASE 21 10
SUMMARY OF AMENDMENTS FOR GC28-6550-9 -- OS RELEASE 20.1