The
unit table contains a pointer to the UCB Pointer List as shown
in the following figure.
Figure 1. Output
from Function Code 3
(Return UCB Addresses)
For authorized callers, the list is returned in the default subpool, 230. For unauthorized callers, the subpool default is 0. See function code 10 for a description of how to change the default subpool. The caller must free the number of bytes in the length field from the subpool before exiting.
Register 15 contains one of the following
return codes:
- Code
- Meaning
- 0
- The unit table contains the pointer to the UCB pointer list.
- 4
- The unit name could not be found in the EDT.
- 16
- Storage was not available for the UCB pointer list.
- 28
- The required input is not specified or is not valid.