IBM OS/390 POWER-JES2 Command Equivalences, Source Code Modifications, JES2 Patching Facility

Table 23.	POWER Exit to JES2 Exits
POWER	Description	JES2 Exit	Comment
Exit
JOBEXIT	Job input - Scan JCL & JECL	EXIT(2)	JOB statement scan
	(POWER exits allow access to	EXIT(3)	JOB accounting field
	SYSOUT data.)	EXIT(4)	Other JCL & JECL
			(No access to SYSIN data.)
NETEXIT	Input from NJE node	EXIT(47)	NJE Headers Received
			(No access to SYSIN or
			SYSOUT data.)
OUTEXIT	Output to printer or punch	EXIT(1)	Job Separator
	(POWER exits allow access to	EXIT(15)	Data Set Separator
	SYSOUT data.)		(No access to SYSIN or
			SYSOUT data.)
XMTEXIT	Output to an NJE node	EXIT(46)	NJE Headers Transmitted
			(No access to SYSIN or
			SYSOUT data.)

10.4.2.1 Source Code Modifications

Most JES2 modules are distributed in source form and can be modified to meet specific customer needs, though this is not recommended by IBM. It is sometimes easier to modify the JES2 source code than accomplish the same thing through exits.

10.4.2.2 The JES2 Patching Facility

Patch and AMASPZAP statements can be used to make minor and temporary modifications to the JES2 object code until JES2 is restarted by directly replacing the changed code. The JES2 Patching Facility changes only the memory copy of data; the copy residing on DASD (for example, LPA) cannot be replaced.

For details and precautions, see the section entitled ²The JES2 Patching Facility² in Chapter 1 of the JES2 Initialization and Tuning Guide.

10.4.3 POWER-JES2 Command Equivalences

There are major differences between JES2 and POWER. This section will compare the products from a different perspective, that of the central operator. Through the migration, the functional role of the operator will remain the same. Therefore the most often asked questions by the central operator will be the following,

1.How do I do a certain function?

2.In POWER, I used ¢xyz¢ command. What command do I use in JES2?

The following figure gives an overview of POWER commands and the JES2 equivalent. See OS/390 JES2 Commands and VSE/POWER Administration and Operation for details.

Chapter 10. POWER and JES2 231