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CICS ISSUE FILECONTROL - File Control Signal

CICS ISSUE FILECONTROL provides file control signaling capabilities for programs and transactions. It enables programs to signal file control operations, manage file control states, and handle file control processing in CICS environments.

What is CICS ISSUE FILECONTROL?

CICS ISSUE FILECONTROL is a command that allows programs to signal file control operations in the system. It provides file control signaling capabilities, file control state management, and file control processing for CICS applications.

Command Syntax

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EXEC CICS ISSUE FILECONTROL
    [FILE(file-name)]
    [OPERATION(operation-type)]
    [RESP(response-code)]
END-EXEC

Parameters

Optional Parameters

  • FILE(file-name) - Name of file for control operation
  • OPERATION(operation-type) - Type of file control operation
  • RESP(response-code) - Response code variable

File Control Operations

File Operations

File operation types

  • • OPEN - Open file
  • • CLOSE - Close file
  • • READ - Read file
  • • WRITE - Write file

File Control

File control types

  • • LOCK - Lock file
  • • UNLOCK - Unlock file
  • • RESET - Reset file
  • • VALIDATE - Validate file

File Management

File management types

  • • ALLOCATE - Allocate file
  • • DEALLOCATE - Deallocate file
  • • BACKUP - Backup file
  • • RESTORE - Restore file

File Monitoring

File monitoring types

  • • STATUS - Check file status
  • • INFO - Get file information
  • • MONITOR - Monitor file
  • • ALERT - File alert

Programming Examples

Basic File Control Signaling

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       IDENTIFICATION DIVISION.
       PROGRAM-ID. ISSUEFILECONTROL01.
       DATA DIVISION.
       WORKING-STORAGE SECTION.
       01  FILE-NAME PIC X(8) VALUE 'MYFILE01'.
       01  OPERATION-TYPE PIC X(8) VALUE 'OPEN'.
       01  RESPONSE-CODE PIC S9(8) COMP.
       
       PROCEDURE DIVISION.
           DISPLAY 'Signaling file control operation'
           DISPLAY 'File: ' FILE-NAME
           DISPLAY 'Operation: ' OPERATION-TYPE
           
           EXEC CICS ISSUE FILECONTROL
               FILE(FILE-NAME)
               OPERATION(OPERATION-TYPE)
               RESP(RESPONSE-CODE)
           END-EXEC
           
           IF RESPONSE-CODE = DFHRESP(NORMAL)
               DISPLAY 'File control operation signaled successfully'
           ELSE
               DISPLAY 'File control operation signal failed'
           END-IF
           
           EXEC CICS RETURN END-EXEC.

Advanced File Control Management

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       IDENTIFICATION DIVISION.
       PROGRAM-ID. ISSUEFILECONTROL02.
       DATA DIVISION.
       WORKING-STORAGE SECTION.
       01  FILE-NAME PIC X(8).
       01  OPERATION-TYPE PIC X(8).
       01  RESPONSE-CODE PIC S9(8) COMP.
       01  OPERATION-COUNT PIC S9(2) COMP VALUE 0.
       01  MAX-OPERATIONS PIC S9(2) COMP VALUE 4.
       01  FILE-STATUS PIC X(1).
       01  FILE-CONTROL-LIST.
           05  FC-ITEM OCCURS 4 TIMES.
               10  FC-FILE-ID PIC X(8).
               10  FC-OPERATION PIC X(8).
               10  FC-STATUS PIC X(1).
       
       PROCEDURE DIVISION.
           PERFORM INITIALIZE-FILE-CONTROLS
           PERFORM SIGNAL-MULTIPLE-FILE-CONTROLS
           
           EXEC CICS RETURN END-EXEC.
       
       INITIALIZE-FILE-CONTROLS.
           MOVE 'FILE001' TO FC-FILE-ID(1)
           MOVE 'OPEN' TO FC-OPERATION(1)
           MOVE 'FILE002' TO FC-FILE-ID(2)
           MOVE 'CLOSE' TO FC-OPERATION(2)
           MOVE 'FILE003' TO FC-FILE-ID(3)
           MOVE 'LOCK' TO FC-OPERATION(3)
           MOVE 'FILE004' TO FC-FILE-ID(4)
           MOVE 'UNLOCK' TO FC-OPERATION(4).
       
       SIGNAL-MULTIPLE-FILE-CONTROLS.
           PERFORM VARYING OPERATION-COUNT FROM 1 BY 1
               UNTIL OPERATION-COUNT > MAX-OPERATIONS
               
               MOVE FC-FILE-ID(OPERATION-COUNT) TO FILE-NAME
               MOVE FC-OPERATION(OPERATION-COUNT) TO OPERATION-TYPE
               PERFORM SIGNAL-SINGLE-FILE-CONTROL
               
               IF RESPONSE-CODE = DFHRESP(NORMAL)
                   MOVE 'S' TO FC-STATUS(OPERATION-COUNT)
                   DISPLAY 'File control ' OPERATION-COUNT ' signaled successfully'
               ELSE
                   MOVE 'F' TO FC-STATUS(OPERATION-COUNT)
                   DISPLAY 'File control ' OPERATION-COUNT ' signal failed'
               END-IF
           END-PERFORM.
       
       SIGNAL-SINGLE-FILE-CONTROL.
           EXEC CICS ISSUE FILECONTROL
               FILE(FILE-NAME)
               OPERATION(OPERATION-TYPE)
               RESP(RESPONSE-CODE)
           END-EXEC.

Error Handling with File Control Signaling

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       IDENTIFICATION DIVISION.
       PROGRAM-ID. ISSUEFILECONTROL03.
       DATA DIVISION.
       WORKING-STORAGE SECTION.
       01  FILE-NAME PIC X(8) VALUE 'MYFILE01'.
       01  OPERATION-TYPE PIC X(8) VALUE 'OPEN'.
       01  RESPONSE-CODE PIC S9(8) COMP.
       01  RETRY-COUNT PIC S9(2) COMP VALUE 0.
       01  MAX-RETRIES PIC S9(2) COMP VALUE 3.
       01  FILE-CONTROL-SIGNAL-SUCCESSFUL PIC X(1) VALUE 'N'.
       
       PROCEDURE DIVISION.
           PERFORM SIGNAL-FILE-CONTROL-WITH-RETRY
           
           EXEC CICS RETURN END-EXEC.
       
       SIGNAL-FILE-CONTROL-WITH-RETRY.
           PERFORM SIGNAL-FILE-CONTROL
           
           IF RESPONSE-CODE NOT = DFHRESP(NORMAL)
               AND RETRY-COUNT < MAX-RETRIES
               ADD 1 TO RETRY-COUNT
               DISPLAY 'Retry ' RETRY-COUNT ' file control signal operation'
               PERFORM SIGNAL-FILE-CONTROL-WITH-RETRY
           END-IF.
       
       SIGNAL-FILE-CONTROL.
           EXEC CICS ISSUE FILECONTROL
               FILE(FILE-NAME)
               OPERATION(OPERATION-TYPE)
               RESP(RESPONSE-CODE)
           END-EXEC
           
           EVALUATE RESPONSE-CODE
               WHEN DFHRESP(NORMAL)
                   MOVE 'Y' TO FILE-CONTROL-SIGNAL-SUCCESSFUL
                   DISPLAY 'File control signal operation successful'
               WHEN DFHRESP(NOTAUTH)
                   DISPLAY 'Not authorized to signal file control'
               WHEN DFHRESP(INVREQ)
                   DISPLAY 'Invalid file control signal request'
               WHEN DFHRESP(FILEERR)
                   DISPLAY 'File control signal error'
               WHEN DFHRESP(FILENOTFOUND)
                   DISPLAY 'File not found'
               WHEN DFHRESP(FILEINUSE)
                   DISPLAY 'File is in use'
               WHEN OTHER
                   DISPLAY 'Unexpected file control signal error'
           END-EVALUATE.

File Control Management

File Control Operations

  • • File Control Signal - Signal file control operation
  • • File Control State - Manage file control state
  • • File Control Validation - Validate file control
  • • File Control Monitoring - Monitor file control status

File Control Lifecycle

  • • File Control Creation - Create file control
  • • File Control Processing - Process file control
  • • File Control Completion - Complete file control
  • • File Control Cleanup - Clean up file control

File Control Monitoring

  • • File Control Tracking - Track file control usage
  • • File Control Auditing - Audit file control operations
  • • File Control Reporting - Report file control status
  • • File Control Analysis - Analyze file control patterns

File Control Error Recovery

  • • File Control Error Detection - Detect file control errors
  • • File Control Error Recovery - Recover from file control errors
  • • File Control Retry Mechanisms - Implement file control retry logic
  • • File Control Fallback Procedures - Use file control fallback procedures

Error Handling

Common Response Codes

  • DFHRESP(NORMAL) - File control signal operation successful
  • DFHRESP(NOTAUTH) - Not authorized to signal file control
  • DFHRESP(INVREQ) - Invalid file control signal request
  • DFHRESP(FILEERR) - File control signal error
  • DFHRESP(FILENOTFOUND) - File not found
  • DFHRESP(FILEINUSE) - File is in use

Performance Considerations

File Control Efficiency

  • • Optimize file control operations - Use efficient file control handling
  • • Minimize file control overhead - Reduce file control processing overhead
  • • Use file control pooling - Implement file control pooling
  • • Monitor file control frequency - Track file control signal patterns

System Impact

  • • Monitor system impact - Track how file control signal affects the system
  • • Optimize file control handling - Ensure efficient file control processing
  • • Manage file control usage - Monitor file control consumption
  • • Track performance metrics - Monitor file control handling performance

Best Practices

File Control Signaling Best Practices

  • • Signal file control only when file control operation is needed
  • • Implement proper error handling for file control operations
  • • Validate file control state before signaling
  • • Use appropriate file control management techniques
  • • Monitor file control signaling activities and performance
  • • Maintain file control signaling audit trails
  • • Handle file control signaling errors gracefully

Explain It Like I'm 5 Years Old

Think of CICS ISSUE FILECONTROL like managing a filing cabinet:

  • • Opening Drawer: "Open the filing cabinet drawer" - File control operation
  • • Finding File: "Find the file you need" - File control signal
  • • Using File: "Use the file" - File control processing
  • • Closing Drawer: "Close the filing cabinet drawer" - File control completion
  • • Done: "You are done with the filing cabinet" - File control finished

Exercises

Exercise 1: Basic File Control Signaling

Create a program that signals basic file control operations.

Exercise 2: Advanced File Control Management

Write a program that manages multiple file control signaling.

Exercise 3: Error Handling

Implement comprehensive error handling for file control signaling failures.

Related Concepts

File Control Management

Managing system file control

File Control Operations

File control operations

File Control Processing

Processing file control

File Control Monitoring

Monitoring file control

Error Handling

Managing file control errors