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File No. 5360-20
Order No. GC28-6550-9 OS




Systems Reference Library




IBM System/360 Operating System:
System Programmer's Guide


~his publication consists of self-contained
chapters, each of which provides information on
how to modify, extend, or implement capabilities
of the IBE 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
Adding SVC Routines
Message Routing Exit Routines
Adding Accounting Routines
IECDSECT, IEFJFCBN. and IEFUCBOB Macro
Instructions
The Must Complete Function of ENQ/DEQ
The EXCP ~acro Instruction
The XDAP Macro Instruction
The Tracing Routine
Implementing Data Set Protection
PRESRES Volume Characteristic List
Residency Options and Link Pack Area
Job Queue Format
System Macro Instructions
Adding System Output Writer Routines
Output separation
System Reader, Initiator, and Writer
Cataloged Procedures
Writing Rollout/Rollin Appendages
Adding a UCS Image to the System Library
The Shared Direct Access Device Option
The ~irne Slicing Facility
Graphic Job Processor Procedures
Satellite Graphic Job Processor Procedures
Preface

This publication consists of self-contained
chapters, each of which provides
information on how to modify, extend, or
implement 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 design of the
operating system and its features. Each
chapter contains its own introductory
section and list of prerequisite
publications. This organization has been
used to reduce cross-referencing and to
facilitate the addition of new chapters.




Ninth Edition (June, 1971)

This is a major revision of, and obsoletes, GC28-6550-8 and
Technical Newsletter GN28-2437, GN28-2452, and GN28-2456.
Changes to the text and changes to illustrations are
indicated by a vertical line to the left of the change.

This edition applies to release 20.1 of IBM System/360 Operating
system, and to all subsequent releases until otherwise
indicated in new editions or Technical Newsletters. Changes
are continually made to the information herein; before using
this publication in connection with the operation of IBM
systems, consult the latest IBM System/360 SRL Newsletter,
Order No. GN20-0360, for the editions that are current and
applicable.


Requests for copies of IBM publications should be made to
your IBM representative or to the branch office serving your
locality.


A form for readers' comments is provided at the back of
this publication. If the form has been removed, comments may
be addressed to IBM Corporation, Programming Systems
Publications, Department D58, PO Box 390, Poughkeepsie, N. Y.
12602




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