Locating the last inserted sequential dependent segment
You can also retrieve the position information for the most recently inserted sequential dependent segment of a given root segment.
To do this, you issue a POS command with a qualification statement
containing the root segment as the segment name. The current position after this type of command
follows the same rules as position after a GU.
After a successful command, the I/O area contains:
- LL
- A 2-byte field containing the total length of the data in the I/O area, in binary.
- Area Name
- An 8-byte field giving the ddname from the AREA statement.
- Position
- An 8-byte field containing the position information for the most recently inserted sequential dependent segment. This field contains zeros provided no sequential dependent for this root exist.
- Unused CIs
- A 4-byte field containing the number of unused CIs in the sequential dependent part.
- Unused CIs
- A 4-byte field containing the number of unused CIs in the independent overflow part.