Execute Channel Program: Difference between revisions

Revision as of 16:13, 5 July 2022

Revision as of 22:54, 21 November 2022

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{{See also|EXCPVR}}

{{more citations needed|date=June 2012}}

In [[IBM mainframe]] [[operating system]]s, '''Execute Channel Program''' ('''EXCP''') is a [[Macro (computer science)|macro]] generating a [[system call]], implemented as a [[Supervisor Call instruction]], for low-level device access, where the programmer is responsible for providing a ''[[Channel program#Channel Program|channel program]]''—a list of device-specific commandsand (CCWs)—toDOS/360 bethrough executed by I[[z/O channels, control units and devicesVSE]].<ref name="Hannula1974">{{cite book

| author=Reino Hannula

| title=Computers and Programming: A System/360-370 Assembler Language Approach

| url=https://books.google.com/books?id=0MgmAAAAMAAJ

| year=1974

| publisher=Houghton Mifflin

| isbn=978-0-395-16796-0

| page=431

}}</ref><ref name="Kapur1970">{{cite book

| author=Gopal K. Kapur

| title=IBM 360 Assembler Language Programming

| url=https://archive.org/details/ibm360assemblerl00kapu/page/453

| url-access=registration

| date=1 January 1970

| publisher=John Wiley & Sons

| isbn=978-0-471-45840-1

| pages=[https://archive.org/details/ibm360assemblerl00kapu/page/453 453–454, 456–459, 461]

}}</ref> EXCP for [[OS/360 and successors]]<ref name="Johnson1989">{{cite book

| author=Robert H. Johnson

| title=MVS: concepts and facilities

| url=https://books.google.com/books?id=HIFQAAAAMAAJ

| date=June 1989

| publisher=Intertext Publications

| isbn=978-0-07-032673-6

| page=558

}}</ref><ref>{{cite manual

| publisher = IBM

| title = z/OS Version 2 Release 4 DFSMSdfp Advanced Services

| date = August 2020

| section = Chapter 4. Executing Your Own Channel Programs

| pages = 151–210

| section-url = https://www.ibm.com/servers/resourcelink/svc00100.nsf/pages/zOSV2R4sc236861/$file/idas300_v2r4.pdf#page=181

| url = https://www.ibm.com/servers/resourcelink/svc00100.nsf/pages/zOSV2R4sc236861/$file/idas300_v2r4.pdf

| id = SC23-6861-40}}

</ref> is more specifically described in the OS System Programmer's Guide.;<ref>{{cite manual|publisher=IBM|title=IBM System/360 Operating System System Programmer's Guide|id=C28-6550-2|date=March 1967|url=http://www.bitsavers.org/pdf/ibm/360/os/R01-08/C28-6550-2_OSsysPrmg_Mar67.pdf}}</ref> EXCP for [[DOS/360 and successors]]<ref name="Stotts1990">{{cite book

| author=Gary A. Stotts

| title=DOS/VSE: Introduction to the Operating System

| date=1 August 1990

| publisher=QED Information Sciences

| isbn=978-0-89435-332-1

| page=18

}}</ref> is more specifically described in DOS Supervisor and I/O Macros.<ref name=GC24-S037-12>{{cite manual

| title = DOS Supervisor and I/O Macros

| id = GC24-S037-12

| publisher = IBM

| url = http://bitsavers.org/pdf/ibm/360/dos/GC24-5037-12_DOS_Supervisor_and_IO_Macros_Oct73.pdf

}}

</ref><ref name=SC34-2709>

{{cite manual

| publisher = IBM

| title = IBM z/VSE Version 6 Release 1 System Macros User's Guide

| year = 2015

| url = http://publibfp.dhe.ibm.com/epubs/pdf/iesmge40.pdf

| id = SC34-2709-00}}

</ref>

This article mostly reflects OS/360 through [[z/OS]]; some details are different for TOS/360 and DOS/360 through [[z/VSE]].

==Specifying datasets==