FACE & FACS are system programs that are used to calculate the SON address of a fixed file record.
Takes as input Decimal Record type and Ordinal Number; looks up into the FACE table for the corresponding SON address.
FACS serves the same purpose as FACE
FACS unlike FACE can calculate the SON file address with a symbolic record type and Ordinal Number
Application Programs enter the utility Program FACE by issuing the macro call - ENTRC FACE.
FACS is preferred over FACE.
The following is the set-up required before calling FACE
R6 Contains the Hexadecimal Record type
R0 Contains the Ordinal Number
R7 Address of an 8-byte field where the system file reference is to be placed. Normally, the location of FARW because the address must be there before the find or file function can be called.
Example of FACS usage
LA R0,0 Load ordinal number
LA R6,=CL8'#IGTSTRN' Symbolic record type
LA R7,CE1FA7 Load address of FARW
ENTRC FACS Call FACS
LTR R0,R0 Test for Error return
BZ EXCEPT Branch to error return
Before Call to FACE/FACS
Before call to FACE/FACS