Feedback area layouts

 

The feedback areas associated with tape or diskette files consist of the open feedback area and the I/O feedback area.

The program presents the following information for each item in these feedback areas:

• Offset, which is the number of bytes from the start of the feedback area to the location of each item

• Data Type

• The program gives the length in number of bytes

• Contents, which is the description of the item and the valid values for it

• File type, which is an indication of what file types are valid for each item

The support provided by the high-level language you are using determines how to access this information and how the program represents the data types. See your high-level language manual for more information.

• Open feedback area
  The open feedback area is the part of the open data path (ODP) that contains general information about the file after the program opens the file. It also contains file-specific information, depending on the file type.

• 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.

 

Parent topic:

Reference

 

Related information

File management