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and DFHTACP writes the ‘DFHTC2522 INTERCEPT REQUIRED’ message to
CSMT; if the task is not marked nonpurgeable, it is abended with code ‘AEXY’ or,
rarely, ‘AEXZ’.
v Abend write has no effect if the TCTTE was associated with a READ request. In
this case the normal result is that, if the line and terminal remain in service, the
read is retried.
v For TCAM pooled terminals, the DFHTACP default action of ABENDT is
inappropriate for unsolicited input and ‘invalid TCAM destination’ types of error.
Abend task results in the pooled terminal entry being placed out of service, which
may lead to line lockouts as available in-service pooled entries become
exhausted. You should therefore set the ABENDT action bit off in the TEP.
Addressing the contents of the TACLE
The TACLE is created by the terminal control program when the error occurs, and
contains all the I/O error information provided by TCAM and BSAM.
To address the contents of the TACLE, the user-written terminal error program
should contain the COPY DFHTACLE and COPY DFHTCTLE statements, in that
order. These define the complete DFHTCTLE DSECT. The symbolic names in this
DSECT are used to address fields in both the TACLE and the real line entry
associated with the error.
The TACLE consists of a 16-byte prefix (defined by COPY DFHTACLE) and a
further 48-byte section, which is a modified copy of the DECB of the real line entry
at the time the TACLE was created.
To address the TACLE, the user-written terminal error program should therefore
contain the statements:
COPY DFHTACLE
COPY DFHTCTLE
L TCTLEAR,TEPCATCA POINT TO TACLE
USING DFHTCTLE,TCTLEAR
Note that fields normally part of the real line entry DECB have offsets increased by
16 in the TACLE.
The following fields in the DECB copy in the TACLE do not represent data copies
from the real line entry:
TCTLEDCB (Offset 24 in TACLE,
8 in real TCTLE)
This field in the TACLE points to the real line entry; in the real line entry, it points to
the TCAM/BSAM DCB for the line group.
TCTLECSW (Offsets 46, 48 in TACLE,
TCTLEALP 30, 32 in real TCTLE)
These are used in the TACLE for SAM error information.
The following statements give direct addressability to the real line entry:
COPY DFHTCTLE
COPY DFHTCTTE
L TCTLEAR,TEPCATCA POINT TO TACLE
USING DFHTCTLE,TCTLEAR
user-written terminal error programs
Chapter 8. Writing a terminal error program 441