IBM AS/400 Strategies for Creating Service Programs, Creating a Service Program Using CRTSRVPGM

Creating a Service Program Using CRTSRVPGM

Strategies for Creating Service Programs

When creating a service program, you should keep in mind:

1. Whether you intend to update the program at a later date

2. Whether any	updates will involve changes to the interface (namely,
and exports	used).

If the interface to a service program changes, then anyyou may have t programs bound to the original service program. However, if the changes are upward-compatible, you may be able to reduce the amount of re-b created the service program using binder language. In this case, aft binder language source to identify the new exports you need to re-b programs that use them.

TIP

If

you

are

planning

a module

with

only

subprocedures

(that is,

with

with

keyword

NOMAIN

specified

on

the

control

specification) you may wa

create

it as

a

service

program.

Only

one

copy

of

a

service

progra

on

a

system,

and so you will need less storage for the module.

Also,

you

can

copyright your service programs using the COPYRIGHT keyw

on

the

control

specification.

Binder

language

gives

you

control

over

the exports

of

a

service

progr

control

can

be

very

useful

if

you

want

to:

¹ Mask certain service program procedures from service-program users

¹Fix problems

¹Enhance function

¹ Reduce the impact of changes to the users of an application.

See “Sample Service Program” on page 94 for an example of using binder guage to create a service program.

For information on binder language, masking exports, and other service pr concepts, seeILE Concepts.

Creating a Service Program	Using CRTSRVPGM
You create a service program using				the	Create Service Program (CRTSRVPG
command.	Any	ILE module	can be bound	into	a service program. The module
must exist before you can create				a service program with it.
Table 9	on	page 93 lists	the CRTSRVPGM	parameters and their defaults. For
full description of the CRTSRVPGM command and its parameters,CL						refer to t
Reference		(Abridged).

92 ILE RPG for AS/400 Programmer's Guide