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Pre-Open Processing (TSIDASS)

8-2 User Reference

Pre-Open Processing (TSIDASS)

Use TSIDASS to process controlled files with programs that do not issue OPEN requests or

that do pre-open checking of assignments. You can also use TSIDASS to make assignments

to SYSRDR, SYSIPT, SYSLST, and SYSPCH.

Its functions are determined by control statements:

•

ASSGN satisfies pre-open assignment checking for tape datasets

• OPEN opens datasets for programs which do not issue an OPEN request

• RSTRT assists with using IBM checkpoint restart facility

TSIDASS is executed immediately before the program that does pre-open assigment checking.

Inhibit LUB allocation for all datasets in the TSIDASS step by using the appropriate option

codes on the TLBL and DLBL statements in the step.

Pre-open assignment checking can also be satisfied with the DD parameter

OPTION=SYSnnn.

dataset labels

// EXEC TSIDASS

control statements

// EXEC <program that performs pre-open assignment checking>

None

Place the labels for all datasets before the EXEC statement for TSIDASS. Do not place any

labels between the EXEC statement for TSIDASS and the EXEC statement for your program.

Use the ASSGN function for tape datasets only. It satisfies pre-open assignment checking by

assigning the logical unit to a dummy tape device. When the program issues an OPEN request

for the dataset, BIM-EPIC performs its usual device assignment to the real device.

For sort programs, we recommend using TSIDSRT to perform this function instead of

TSIDASS. See 7-37 in this manual for more information and JCL examples.

You can also use ASSGN to make assignments to the system logical units SYSRDR, SYSIPT,

SYSLST, and SYSPCH. When you make these assignments, be sure to submit their control

statements last, because TSIDASS stops processing control statements after one of these

assignments is made.

Description

Note

JCL Requirements

UPSI Values

Dataset

Requirements

ASSGN Statements

1 2 ... 281 282 283 284 285 286 287 288 289 290 291 ... 488 489

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