ILE RPG Language Reference
Device Specific Feedback Information
The device specific feedback information in the file information
data structure starts at position 367 in the INFDS, and contains input/output
feedback information specific to a device.
The length of the INFDS when device specific feedback information
is required, depends on two factors: the device type of the file,
and on whether DISK files are keyed or not. The minimum length is
528; but some files require a longer INFDS.
- For WORKSTN files, the INFDS is long enough to hold the device-specific
feedback information for any type of display or ICF file starting
at position 241. For example, if the longest device-specific feedback
information requires 390 bytes, the INFDS for WORKSTN files is 630
bytes long (240+390=630).
- For externally described DISK files, the INFDS is at least long
enough to hold the longest key in the file beginning at position 401.
More information on the contents and length of the device feedback
for database file, printer files, ICF and display files can be found
in the iSeries Information Center database and file systems category.
The contents of the device specific input/output feedback area
of the file are copied by RPG to the device specific feedback section
of the INFDS:
- If the presence of a POST operation affects the file:
- only after a POST for the file.
- Otherwise:
- after each I/O operation, if blocking is
not active for the file.
- after the I/O request to data management to get or put a block
of data, if blocking is active for the file.
Notes:
- After each keyed input operation, only the key fields will be
updated.
- After each non-keyed input operation, only the relative record
number will be updated.
For more information see POST (Post).
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