Execute Channel Program: Difference between revisions

Revision as of 18:37, 14 January 2021

Revision as of 06:47, 27 February 2021

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| 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

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}}</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

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==Appendages==

A comprehensive list of ''appendages''{{sfn|DFSMSdfp|loc=[https://www-01.ibm.com/servers/resourcelink/svc00100.nsf/pages/zOSV2R4sc236861/$file/idas300_v2r4.pdf#page=229 EXCP and EXCPVR Appendages]|pp=199-200}} ([[User exit|exits]] in the EXCP context) allows authorized programs{{efn|There are several type of authorization for the use of appendages:

*A program that is APF authorized, running in a system (0-7) key or in Supervisor Mode may use any appendage.

*A program may use any appendage that is automatically selected by OPEN for the use of an access method.

*A prgram may use any appendage that is defined at IPL time in IEAAPP00.{{sfn|DFSMSdfp|loc=[https://www-01.ibm.com/servers/resourcelink/svc00100.nsf/pages/zOSV2R4sc236861/$file/idas300_v2r4.pdf#page=231 The Authorized Appendage List (IEAAPP00)], pp=201-202}}

}} to override or augment many of the system security and data integrity checks. Most of these appendages are supported for compatibility with earlier instances of the OS, but the functions of several have been modified or extended for MVS. The appendages are specified in the DCB as the last two characters of the module name IGG019xx, where xx = WA to Z9, inclusive. These module names are reserved for installation-written appendages. Any other name of the form IGG019xx is reserved for use by IBM access methods.<ref>IGG = I/O Support component prefix; 019 = Open SVC sub-component; xx = sub-function</ref> Appendages must reside in SYS1.SVCLIB (SYS1.LPALIB in SVS or later instances of the OS).