IBM SC33-1683-02 - Manual (Page 235)

Terminal allocation program exit XALCAID
XALCAID is driven when an AID with data is canceled in one of the following ways:
v By means of the CEMT transaction
v During execution of a SET TERMINAL or SET CONNECTION command
v During reinstallation of a terminal or connection.
XALCAID is invoked only if there is data associated with the AID.
Exit XALCAID
When invoked
Whenever an AID with data is canceled.
Note: It is not possible for the exit to prevent the request from being
canceled.
Exit-specific parameters
UEPALTSD
Address of a 4-byte field containing the symbolic identifier of the
transaction which was to be started by this request.
UEPALTRM
Address of a 4-byte field containing the identifier of the terminal or
connection to which this request was directed.
UEPALDAT
Address of an area of storage containing the data specified in the
FROM option; or hexadecimal zeros, if the AID was created by a
START request without a FROM option.
UEPALLEN
Address of a fullword binary field containing the length of the FROM
data; or hexadecimal zeros, if the FROM option was not specified.
UEPALRQD
Address of an 8-byte field containing the value of the REQID
associated with the FROM data. The data was stored in a
temporary storage queue with this name. This value was either
specified explicitly using the REQID option on the START
command, or created internally by CICS.
UEPALQUE
Address of an 8-byte field containing the value specified in the
QUEUE option on the START command, or hexadecimal zeros if
QUEUE was not specified.
UEPALRTE
Address of a 4-byte field containing the value specified in the
RTERMID option on the START command, or hexadecimal zeros if
RTERMID was not specified.
UEPALRTA
Address of a 4-byte field containing the value specified in the
RTRANSID option on the START command, or hexadecimal zeros if
RTRANSID was not specified.
UEPALFMH
Address of a 1-byte field containing the value X'FF' if the data
terminal allocation program exit
Chapter 1. Global user exit programs 203