The TPFDF mechanism for
transferring control between high-access TPFDF routines.
fast-link table
A TPFDF table containing the
main storage addresses of all TPFDF fast-link programs.
fast-link segment
A segment that contains
high-access TPFDF routines.
field
A single data element in an LREC;
for example, a date, name, or address.
file
Physically, a file comprises a
collection of blocks, all having the same file ID. Logically, a file
consists of LRECs contained in one or more subfiles. A TPFDF file is
defined by a DSECT macro.
file ID
A 2-byte identifier in a block
(record). It has the same value for all blocks (records) in a
file. The file ID is included in the block header. Synonymous
with record ID.
fixed file
A TPFDF file where the prime
blocks of each subfile are contained in TPF or ALCS fixed file records.
Typically, fixed files are permanently assigned to a specific function or file
type. Contrast with pool file.
fixed-length logical record (LREC)
A logical
record (LREC) where all fields in the record have a fixed length. See
also variable-length logical record (LREC) and extended
logical record (LREC).
fixed-length LREC
Fixed-length logical
record.
fullfile
An operation that allows TPFDF
processing to access more than one subfile in a file.