SVC 31 (0A1F)

FEOV macro - is type 4, gets LOCAL lock.

Calls module IGC0003A.

GTF data is:
R15 and R0
No applicable data.
R1
High-order byte–flags as follows:
00
No option specified.
20
REWIND specified.
30
LEAVE specified.
Three low-order bytes–address of DCB.
     
DDNAME cccccccc DDNAME associated with this request.