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IBM OS/390 manual Job Information Services, Output Retrieval, Other Interfaces

Models: OS/390

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Job Information Services

Current Job Identification

If you have code that is called by an MVS application, you can obtain information about the job currently running in an address space with the IAZXJSAB macro. You can retrieve information such as:

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Name of the subsystem that scheduled the job Job identifier

Job name

User ID associated with the job Time when the job started running JES status of the job

 

See OS/390 MVS Auth Assm Services Reference

 

ENF-ITT, GC28-1765 for details.

Checkpoint Versions

Subsystem Interface (SSI) function code 71 - the ²job

 

information service² provides an interface to acquire

 

data from a copy of the checkpoint data. This allows

 

you to find out about any job in the system known to

 

JES2. See Appendix D in JES2 Multi-Access Spool in a

 

Sysplex Environment, GG66-3263 for details.

Extended Status6

Subsystem Interface (SSI) function code 80. This is an

 

improved form of the STATUS SSI (function code 3).

 

See Using the Subsystem Interface.

Output Retrieval

SYSOUT API6Use the SYSOUT Application Programming Interface (SSI function code 79) to retrieve output from JES2. This is an improved version of the PSO SSI (function code 1). See Using the Subsystem Interface.

Spool Data Set Browse Use this to dynamically allocate a spool data set and use standard I/O macros to read the file. See OS/390 MVS Auth Assembler Services Guide, GC28-1763.

Sample FSS6

Use this as a model when writing your own Functional

 

SubSystem, or as a tool for testing JES2 FSS printing.

 

See OS/390 Using the Functional Subsystem Interface,

 

SC28-1911.

Other Interfaces

 

Cancel Job

You can cancel a job with SSI function code 2. See the

 

²SSCS² mapping DSECT in the OS/390 MVS Data Areas,

 

Vol 5 (SSAG-XTLST),SY28-1168.

6Available in OS/390 Release 3.

222VSE to OS/390 Migration Workbook

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Page 246
Image 246
IBM OS/390 manual Job Information Services, Output Retrieval, Other Interfaces
Page 245 Page 247

OS/390 specifications

IBM OS/390, a versatile operating system, was a cornerstone in enterprise environments and played a pivotal role in mainframe computing. Released in the mid-1990s, OS/390 combined the strengths of IBM's MVS (Multiple Virtual Storage) with new features and enhancements, targeting scalability, reliability, and performance in demanding business applications.

One of the key features of OS/390 was its robust support for multiple users and processes. The system allowed thousands of concurrent users to access applications and data, ensuring high availability and minimizing downtime—a critical requirement for many large organizations. This scalability was supported through various enhancements in memory management and processor scheduling, enabling optimal resource allocation across diverse workloads.

OS/390 was known for its superior workload management capabilities. The Workload Manager (WLM) component allowed administrators to define service policies, specifying how system resources would be allocated according to the priority of tasks. This ensured that critical business processes received the necessary resources while less critical tasks were managed more flexibly.

Another significant characteristic of OS/390 was its commitment to security. The operating system provided comprehensive security features, including user authentication, data encryption, and auditing capabilities. This focus on security was vital for organizations handling sensitive data, ensuring compliance with regulations and safeguarding against unauthorized access.

OS/390 also supported advanced technologies that facilitated integration and development. The system included features like the IBM CICS (Customer Information Control System) for transaction processing and IMS (Information Management System) for database management. These technologies allowed organizations to build robust, high-performance applications tailored to specific business needs.

The ease of network integration was another strength of OS/390. With the advent of the Internet and global connectivity, OS/390 systems could easily interface with various network protocols, enabling businesses to operate in a connected world. This inclusion paved the way for many organizations to expand their capabilities and offer new services, driving digital transformation.

In conclusion, IBM OS/390 represented a significant advancement in mainframe technology, combining scalability, security, and robust workload management. Its rich feature set and support for critical enterprise applications solidified its role as a vital component of many organizations' IT infrastructures, ensuring they could meet their operational challenges head-on while supporting future growth. As technology continues to evolve, the legacy of OS/390 remains influential in the realm of computing.