I/O feedback area

 

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

The system updates the I/O feedback area for every I/O operation unless your program uses a blocked record I/O. In that case, the system updates the feedback area only when you read or write 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 manual to determine if your program uses blocked record I/O.

The I/O feedback area consists of two parts: Common I/O Feedback Area and a file-dependent area. The file-dependent area varies by the file type.

• Common I/O feedback area
  This table describes the fields in the common I/O feedback area.

 

Parent topic:

Feedback area layouts