Interface to the exit

The JCL-variable-substitution exit is invoked in task mode, problem state, and key 8 and the job-step task is APF-authorized. The active task runs with the same access authority as the job-step task. The exit must restore this state before returning to its caller.

The exit is called using the BASSM instruction and must return to its caller using the address and addressing mode passed to it in general register 14. The recommended method is to restore all registers to their values on entry to the exit and return to the caller using a BSM 0,14 instruction.

If the exit is entered in AMODE 31, it must switch to AMODE 24 before performing any input or output operations, and then switch back to AMODE 31 before returning to the caller.

If the exit abends, it is flagged as not executable, and message EQQJ518E is issued. Tivoli Workload Scheduler for z/OS does not try to call the exit again.

Parameters passed to the exit all reside below the 16 MB line. Also, addresses passed to the exit are addresses of areas below the 16 MB line.

When the exit is entered, register 1 contains the address of the parameter list. Each address in this list is used to locate the parameter value. These parameters are passed to this exit:

VARNAME   DS  CL8    (Name of variable for substitution)
VARTAB    DS  CL16   (JCL-variable-table name)
VARLGTH   DS  F      (Required length of variable value)
VARDEF    DS  CL44   (Variable default value as defined in table)
VARNVAL   DS  CL44   (Variable value, set by exit)
VAROPRP   DS  A      (Address of operation data)
VARWSP    DS  A      (Address of workstation data)
VAROCCP   DS  A      (Address of occurrence data)
VARDWEEK  DS  CL1    (Day of week: 1-7, where 1 is Monday)
VARWEEKY  DS  CL2    (Week of year)
VARRETC   DS  F      (Return code, set by exit)
MCAUSERF  DS  A      (Address set by the user in the EQQUX000 exit)
VARJCL    DS  CL80   (Current JCL line where this variable was found)
VARFIRST  DS  A      (Address of the first JCL line for the job)
VARLINES  DS  F      (Number of JCL lines in the job)
VARUFLN   DS  F      (Number of user fields)
VARUFLB   DS  A      (Address of user fields buffer)

VARNAME

The name of the variable for substitution.

VARTAB

The name of the JCL-variable table.

VARLGTH

The required length of the variable value or X'00' if a length is not defined for the variable.

VARDEF

The default value of the variable as defined in the variable table, left-justified and padded with X'40'.

VARNVAL

The value of the variable set by the exit.

VAROPRP

The address of operation data. The storage at this address is mapped by the program-interface (PIF) segment CPOP.

VARWSP

The address of workstation data. The storage at this address is mapped by the PIF segment WSCOM.

VAROCCP

The address of occurrence data. The storage at this address is mapped by the PIF segment CPOC.

VARDWEEK

The day of the week when the exit is called. It is a numeric value from 1 to 7, where 1 is Monday.

VARWEEKY

The number of the current week in the year. It is a numeric value from 1 to 53 and is calculated according to the international standard ISO 8601.

VARRETC

The return code set by the exit. These values are valid:

0

Variable processing normal.

8

Stop tailoring. If the exit was called at job submission, the operation is set to ended-in-error. If it was called at setup via the online dialogs, an error message is issued at the terminal.

MCAUSERF

A user field that lets you allocate resources in the start/stop exit, EQQUX000, that this exit can later use. This field contains the address that is set in EQQUX000. Tivoli Workload Scheduler for z/OS does not use or update this field.

VARJCL

The JCL line where this variable was found. It is set to blank characters if you are submitting a job definition contained in the SCRPTLIB library.

VARFIRST

The address of the first JCL line. It is set to zero if you are submitting a job definition contained in the SCRPTLIB library.

VARLINES

The number of JCL lines. It is set to zero if you are submitting a job definition contained in the SCRPTLIB library.

VARUFLN

The number of user field records in USRFAREA.

VARUFLB

The address of the user field area. It is laid out as follows:

USRFAREA

USRFNAME DS   CL16         (User field name)
USRFVAL  DS   CL54         (User field value)