Format identifiers for the /DISPLAY command

Output from the /DISPLAY command includes a format identifier (FID) on each output segment. /DISPLAY commands generally return multiple lines with different formats to the AO application. Your AO application uses the FID to determine what type of line it is processing. A DFS message might be produced with no FID when there is a syntax error.

When a /DISPLAY command is entered with an ICMD call, a command response segment is always produced. Normally, the response is a multi-segment message. Each segment contains EBCDIC and line control characters. Each segment varies in length with a maximum of 132 but usually less than 80 characters.

The FID is 3 bytes of EBCDIC characters. It appears at the beginning of each line, after the LLZZ and any optional carriage control character. The format of the FID is:

FID character 1: Specific /DISPLAY command class (A-Z)
FID characters 2-3: Type of output line

The following are the values you can receive in FID characters 1-3 when issuing /DISPLAY using an ICMD.

FID char 1

Defines specific /DISPLAY command:

A: /DISPLAY ACTIVE, /DIS AOITOKEN, /DISPLAY APPC
B: /DISPLAY PSB
C: /DISPLAY CONVERSATION
D: /DISPLAY AREA, /DISPLAY DATABASE, /DISPLAY DESCRIPTOR
E: /DISPLAY MSNAME
F: /DISPLAY LTERM
G: /DISPLAY SHUTDOWN STATUS
H: /DISPLAY ASMT LINE/PTERM/LTERM/NODE/USER, /DISPLAY HSB
I: /DISPLAY ASMT LINK/MSPLINK/SYSID/MSNAME
J: /DISPLAY DBD
K: /DISPLAY LINK
L: /DISPLAY LINE, /DISPLAY LUNAME, /DISPLAY PTERM
M: /DISPLAY MASTER (/RDISPLAY)
N: /DISPLAY NODE
P: /DISPLAY PROGRAM
Q: /DISPLAY Q
R: /DISPLAY RTCODE
S: /DISPLAY STATUS
T: /DISPLAY TRANSACTION, /DISPLAY TIMEOVER, /DISPLAY SYSID TRANSACTION
U: /DISPLAY USER, /DISPLAY TRACE
V: /DISPLAY CCTL, /DISPLAY OASN SUBSYS, /DISPLAY SUBSYS
W: /DISPLAY OLDS
X: Time stamp, /DISPLAY POOL DSECTS
Y: /DISPLAY MODIFY
Z: /DISPLAY HSSP

FID chars 2-3

Defines type of output line:

00-49: Data line
50-69: Message line
70-89: Heading line
90-98: Reserved
99: Time stamp line

The response to the /DISPLAY POOL command does not include a FID. You can get similar information about a buffer pool using a DL/I STAT call, although the STAT call returns no Fast Path information.