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The field JCRSTRID (the system-type ID) and the field JCRUTRID (the user-type
ID) in the system header allow you to distinguish those journal records output by
CICS (by such components as terminal control), from those issued by direct user
requests.
For CICS journal requests, JCRUTRID contains binary zeros, and JCRSTRID
contains a 1-byte function code followed by a 1-byte module code. The function
code tells you which function was being journaled, and the module code shows
which module caused the record to be written. Valid settings of these codes are
contained in the member DFHFMIDS of the CICS assembler-language macro
library. Figure 79 on page 651 shows the valid function identifiers of those CICS
components that issue journal requests. Figure 80 on page 652 shows the valid
module identifiers.
For user journal requests, JCRSTRID always contains binary zeros, and JCRUTRID
contains the 2-byte hexadecimal code specified by the JTYPEID keyword of the
WRITE JOURNALNAME request in the application program.
The system prefix is 25 bytes long. Its format is shown in Figure 77.
For some CICS journal requests, additional data is included in the system prefix to
identify more specifically the originator of the request. This extra data follows the
common fields of the system prefix, and is usually variable in length; hence the
need for the length field JCSPLL at the start of the system prefix. All the following
have their own prefix layout, and these are described, for the purposes of diagnosis
and recovery, in the
CICS Data Areas
manual.
The user prefix is a variable length area. It is present if this record has been written
by a user request, an EXEC CICS WRITE JOURNALNAME command. The
information contained in the record is set by the user within the terms of the
Task number
JCSPTASK
13 4 4 4
Terminal ID
JCSPTERM
Transaction ID
JCSPTRAN
Time of request
JCSPTIME
Length of system
prefix
JCSPLL
22
Reserved
Flag
JCSPF1
Fixed length
X'01' User prefix present
X'02' Physical start-of-task, JCSPSOTK
X'04' Logical start-of-task, JCSPLSTK
Figure 77. Format of the system prefix
journaling
Chapter 23. CICS logging and journaling 649