Feedback area layouts

 

Tables in this section describe the Open feedback area and the I/O feedback area associated with any opened file. The following information is presented 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

• Length, which is given 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 each item is valid for

The support provided by the high-level language you are using determines how to access this information and how the data types are represented. See your high-level language information 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 it has been opened. It also contains file-specific information, depending on the file type, plus information about each device or communications session defined for the file. This information is set during open processing and can be updated as other operations are performed.

• 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.

 

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