VSE JCL and Subroutines for Application Programmers
Leo J. Langevin · 1992
From the Publisher: Written for application programmers and operations personnel, this book helps you master JCL to control the execution of batch and online jobs, to define resources, and to control job flow. To do this, Langevin uses real working situations and explains each statement as he presents it. Each example is progressively more difficult. This lets you build gradually to complete mastery of VSE JCL. Questions and answers at the end of each section let you test your understanding. After an introduction to VSE, you'll learn how to define a job. You'll learn about the JOB statement, the EOJ statement, logical addressing, the UPSI statement, the EXEC statement, and the EOF statements, what they are, what they do, and how to use them. You'll next discuss assignment of resources and how to define resources that are stored or will be stored on a disk. Statements include ASSGN, DLBL, and EXTENT. Chapter 3 covers the hardware functions of tape and DASD as well as control statements to perform hardware requests to acquire and partition data. Then you learn how to access and use the VSE library. VSE can set parameters and make decisions within the JCL. You'll cover these items so you can create a job-stream to run differently based on the condition of its execution. Topics include return codes, labels, branching, conditional JCL, and using variables. Then you'll move on to procedures and source library includes. You'll also learn less frequently used JCL statements such as DVCUP, DVCDN, RESET, RERUN, and PAUSE, as well as security. Then Langevin teaches you how to use Power to control the printing, punching, and reading of unit record data. Langevin also provides 24 subroutines useful for application programming. These can be assembled and catalogued where your application program can access them. These subroutines can get the current date and the //DATE parameter value, convert hex to displayable characters, get the value in the program execution parameters, issue more Power c