I/O feedback area

 

The i5/OS^® operating system uses messages and I/O feedback information to communicate the results of I/O operations to the program.

The system updates the I/O feedback area for every successful I/O operation unless your program uses blocked record I/O.

In that case, the system updates the feedback area only when it reads or writes a block of records. Some of the information reflects the last record in the block. Other information, such as the count of I/O operations, reflects the number of operations on blocks of records and not the number of records. See your high-level language information to determine if your program uses blocked record I/O.

The I/O feedback area consists of two parts: a common area and a file-dependent area.

• Common I/O feedback area
  This table shows the common I/O feedback area of the i5/OS operating system.

• I/O feedback area for ICF and display files
  The table in this topic shows the I/O feedback area for ICF and display files.

• I/O feedback area for printer files
  The table in this topic shows the I/O feedback area for printer files.

• I/O feedback area for database files
  The table in this topic shows the I/O feedback area for database files.

• Get attributes feedback area
  Performing the get attributes operation allows you to obtain certain information about a specific display device or ICF session.

 

Parent topic:

Feedback area layouts

 

Related concepts

Monitoring file status with the open and I/O feedback area