Progress0 of 0 lessons

CICS INQUIRE PROCESS - Process Inquiry Operations

CICS INQUIRE PROCESS provides process inquiry capabilities in CICS environments. It enables programs to query process information, retrieve process details, and manage process inquiries in CICS applications.

What is CICS INQUIRE PROCESS?

CICS INQUIRE PROCESS is a command that allows programs to query process information, retrieve process details, and manage process inquiries in CICS environments. It provides process inquiry capabilities, status checking, and inquiry management for CICS applications.

Command Syntax

cobol
1
2
3
4
5
6
EXEC CICS INQUIRE PROCESS
    [PROCESSID(process-id)]
    [INTO(data-area)]
    [LENGTH(data-length)]
    [RESP(response-code)]
END-EXEC

Parameters

Optional Parameters

  • PROCESSID - Process identifier to inquire about
  • INTO - Data area to receive process information
  • LENGTH - Length of data to retrieve
  • RESP - Response code variable

Process Inquiry Types

Status Inquiry

Query process status information

  • • RUNNING STATUS - Check if process is currently running and executing
  • • WAITING STATUS - Check if process is waiting for resources or events
  • • SUSPENDED STATUS - Check if process is suspended or paused
  • • TERMINATED STATUS - Check if process has been terminated or completed

Attribute Inquiry

Query process attribute information

  • • PROCESS ATTRIBUTES - Retrieve detailed process attribute information
  • • CONFIGURATION ATTRIBUTES - Retrieve process configuration settings
  • • RUNTIME ATTRIBUTES - Retrieve current runtime process attributes
  • • METADATA ATTRIBUTES - Retrieve process metadata and descriptive information

Resource Inquiry

Query process resource information

  • • RESOURCE USAGE - Retrieve process resource consumption information
  • • MEMORY USAGE - Retrieve process memory allocation and usage
  • • CPU USAGE - Retrieve process CPU time and utilization
  • • I/O USAGE - Retrieve process I/O operations and statistics

Relationship Inquiry

Query process relationship information

  • • PARENT PROCESSES - Retrieve information about parent or controlling processes
  • • CHILD PROCESSES - Retrieve information about child or dependent processes
  • • RELATED PROCESSES - Retrieve information about related or associated processes
  • • DEPENDENCY RELATIONSHIPS - Retrieve information about process dependencies and relationships

Programming Examples

Basic Process Inquiry

cobol
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
       IDENTIFICATION DIVISION.
       PROGRAM-ID. INQUIRE01.
       DATA DIVISION.
       WORKING-STORAGE SECTION.
       01  PROCESS-ID       PIC X(8) VALUE 'PROC001'.
       01  DATA-AREA        PIC X(1000).
       01  DATA-LENGTH      PIC S9(8) COMP.
       01  RESPONSE-CODE    PIC S9(8) COMP.
       
       PROCEDURE DIVISION.
           EXEC CICS INQUIRE PROCESS
               PROCESSID(PROCESS-ID)
               INTO(DATA-AREA)
               LENGTH(DATA-LENGTH)
               RESP(RESPONSE-CODE)
           END-EXEC
           
           IF RESPONSE-CODE = DFHRESP(NORMAL)
               DISPLAY 'Process inquiry successful'
               DISPLAY 'Process ID: ' PROCESS-ID
               DISPLAY 'Data length: ' DATA-LENGTH
           ELSE
               DISPLAY 'Failed to inquire process'
           END-IF
           
           EXEC CICS RETURN END-EXEC.

Process Status Check

cobol
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
       IDENTIFICATION DIVISION.
       PROGRAM-ID. INQUIRE02.
       DATA DIVISION.
       WORKING-STORAGE SECTION.
       01  PROCESS-ID       PIC X(8) VALUE 'PROC002'.
       01  DATA-AREA        PIC X(1000).
       01  DATA-LENGTH      PIC S9(8) COMP.
       01  RESPONSE-CODE    PIC S9(8) COMP.
       01  PROCESS-STATUS   PIC X(10).
       
       PROCEDURE DIVISION.
           EXEC CICS INQUIRE PROCESS
               PROCESSID(PROCESS-ID)
               INTO(DATA-AREA)
               LENGTH(DATA-LENGTH)
               RESP(RESPONSE-CODE)
           END-EXEC
           
           IF RESPONSE-CODE = DFHRESP(NORMAL)
               MOVE DATA-AREA(1:10) TO PROCESS-STATUS
               DISPLAY 'Process Status: ' PROCESS-STATUS
               
               EVALUATE PROCESS-STATUS
                   WHEN 'RUNNING'
                       DISPLAY 'Process is currently running'
                   WHEN 'WAITING'
                       DISPLAY 'Process is waiting for resources'
                   WHEN 'SUSPENDED'
                       DISPLAY 'Process is suspended'
                   WHEN 'TERMINATED'
                       DISPLAY 'Process has been terminated'
                   WHEN OTHER
                       DISPLAY 'Unknown process status'
               END-EVALUATE
           ELSE
               DISPLAY 'Failed to check process status'
           END-IF
           
           EXEC CICS RETURN END-EXEC.

Error Handling with Process Inquiry

cobol
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
       IDENTIFICATION DIVISION.
       PROGRAM-ID. INQUIRE03.
       DATA DIVISION.
       WORKING-STORAGE SECTION.
       01  PROCESS-ID       PIC X(8) VALUE 'PROC003'.
       01  DATA-AREA        PIC X(1000).
       01  DATA-LENGTH      PIC S9(8) COMP.
       01  RESPONSE-CODE    PIC S9(8) COMP.
       
       PROCEDURE DIVISION.
           EXEC CICS INQUIRE PROCESS
               PROCESSID(PROCESS-ID)
               INTO(DATA-AREA)
               LENGTH(DATA-LENGTH)
               RESP(RESPONSE-CODE)
           END-EXEC
           
           EVALUATE RESPONSE-CODE
               WHEN DFHRESP(NORMAL)
                   DISPLAY 'Process inquiry successful'
                   DISPLAY 'Process ID: ' PROCESS-ID
               WHEN DFHRESP(NOTFND)
                   DISPLAY 'Process not found'
               WHEN DFHRESP(INVREQ)
                   DISPLAY 'Invalid inquiry request'
               WHEN DFHRESP(PROCESSERR)
                   DISPLAY 'Process-specific error occurred'
               WHEN DFHRESP(INQUIREERR)
                   DISPLAY 'Inquiry-specific error occurred'
               WHEN OTHER
                   DISPLAY 'Unexpected error occurred'
           END-EVALUATE
           
           EXEC CICS RETURN END-EXEC.

Process Inquiry Management

Inquiry State Management

  • • Inquiry State Tracking - Track the current state of inquiry operations
  • • Inquiry State Maintenance - Maintain inquiry state across operations
  • • Inquiry Context Management - Manage inquiry context and environment
  • • Inquiry Session Management - Manage inquiry session lifecycle

Process Management

  • • Process Data Management - Manage process data during inquiry operations
  • • Process State Management - Manage process state during inquiry operations
  • • Process Metadata Management - Manage process metadata during inquiry operations
  • • Process Access Management - Manage process access during inquiry operations

Resource Management

  • • Resource Monitoring - Monitor process resource usage during inquiry operations
  • • Resource Allocation - Track process resource allocation during inquiry operations
  • • Resource Cleanup - Manage process resource cleanup after inquiry operations
  • • Resource Optimization - Optimize process resource usage based on inquiry results

Error Management

  • • Error Detection - Detect errors during inquiry operations
  • • Error Recovery - Recover from inquiry operation errors
  • • Error Reporting - Report inquiry operation errors
  • • Error Prevention - Prevent future inquiry operation errors

Error Handling

Common Response Codes

  • DFHRESP(NORMAL) - Process inquiry successful
  • DFHRESP(NOTFND) - Process not found
  • DFHRESP(INVREQ) - Invalid inquiry request
  • DFHRESP(PROCESSERR) - Process-specific error
  • DFHRESP(INQUIREERR) - Inquiry-specific error
  • DFHRESP(AUTHORITYERR) - Authorization error

Performance Considerations

Inquiry Efficiency

  • • Optimize inquiry operations - Use appropriate inquiry methods for different process types
  • • Minimize inquiry overhead - Reduce the computational cost of inquiry operations
  • • Use efficient inquiry patterns - Implement inquiry strategies that minimize resource usage
  • • Monitor inquiry performance - Track the performance impact of inquiry operations

Resource Impact

  • • Monitor resource usage - Track how inquiry operations consume system resources
  • • Optimize resource allocation - Ensure efficient allocation of resources for inquiries
  • • Manage resource cleanup - Properly clean up resources after inquiry operations
  • • Track resource utilization - Monitor the overall resource consumption patterns

Best Practices

Process Inquiry Best Practices

  • • Always check response codes
  • • Use appropriate inquiry parameters
  • • Implement proper error handling
  • • Ensure proper inquiry state management
  • • Validate inquiry operations
  • • Optimize inquiry operations
  • • Clean up resources properly

Explain It Like I'm 5 Years Old

Think of CICS INQUIRE PROCESS like asking about a worker:

  • • Worker Name: "Which worker to ask about" - The process ID
  • • Ask Questions: "Ask about the worker" - Inquire about process
  • • Get Answers: "Get information about the worker" - Receive process details
  • • Check Status: "See if worker is busy or free" - Check process status
  • • Learn More: "Find out more about the worker" - Get detailed process information

Exercises

Exercise 1: Basic Process Inquiry

Create a program that inquires about process information using INQUIRE PROCESS.

Exercise 2: Process Status Check

Write a program that checks the status of multiple processes using INQUIRE PROCESS.

Exercise 3: Error Handling

Implement comprehensive error handling for process inquiry failures and invalid process IDs.

Related Concepts

Process Management

Managing system processes

Inquiry Operations

Managing inquiry operations

Process Monitoring

Monitoring system processes

Process Processing

Processing system processes

Error Handling

Managing inquiry errors