Configuration services XID exit routine parameter list

When the exit gets control, the address of the following parameter list is in register 1.

Table 1. Configuration services XID exit routine parameter list
Dec (Hex) offset	Size (Bytes)	Description
0 (0)	4	Address of the vector length field This field points to a 2-byte field that identifies the length of the entire vector.
4 (4)	4	Address of vector type field This field points to a 1-byte field that identifies the type of vector that is passed to the exit.
8 (8)	4	Address of vector data This field points to the vector data that is passed to the exit.
12 (C)	4	Address of exit work area This field points to an 8-byte field used by the exit to store the address of the exit's allocated storage. VTAM® saves the contents of this user field after every successful invocation of the configuration services XID exit routine. Thus, the contents are available to the exit routine the next time the routine is called. The last 4 bytes could be used to uniquely identify an exit's level or version. The last 4 bytes will be displayed following subsequent use of the DISPLAY EXIT command (see z/OS Communications Server: SNA Operation for information about this command).
16 (10)	4	For activation or deactivation functions, offset XX'10' can contain the address of a parameter string if you specify a value for the PARMS operand on the MODIFY EXIT command. The parameter string is only available for vector types BEGIN (XX'00') and END (XX'FF'). The parameter string is in the form of a 2-byte length field followed by the actual character data.