IBM SC33-1683-02 - Manual (Page 682)

command via the JTYPEID, PREFIX, and PFXLENG parameters. Its format is
shown in Figure 78.
Field JCSPUP is set in the system prefix area if a user prefix is present in a journal
record.
The journaled data then follows. If you want a length field for the data, you must
include it in the data. Alternatively, you can compute the length of the data portion
of a journal record by taking the length of the system header (10 bytes), plus the
length of the system prefix (JCSPLL), plus the length of the user prefix (in the field,
if any, defined by yourself), and subtracting the total from the length of the journal
record (JCRLL):
JCRLL - (system header (10) bytes + JCSPLL + user prefix)
Not all journal records contain journaled data.
The CICS components that issue journaling requests are journal control, file control,
FEPI, and terminal control.
Vari abl e
length
User prefix data Length of user prefix
Figure 78. Format of the user prefix
journaling
650 CICS TS for OS/390: CICS Customization Guide