Re: Service programs

I will send you an example when I get back to work Monday, but here is a
basic view.

1)  A service program is created from a group of subprocedures.
2)  the subprocedures can be written in a single source member, or separate
source modules
3)  You CAN write/read/update/chain/reade, etc. to files in the
subprocedures, but there are a few items you must know to accomplish this:
      a)  The file specs must be declared outside the P-specs
      b)  If you use the technique of PREFIXing the I/O fields, and creating
a DS containing the fields with LIKEREC or EXTNAME, the DSs _must_ be
declared in the D-specs BEFORE the P-specs, making them 'global'.
4)  If you want the subprocedures to be callable by each other, you must
include the EXPORT keyword on the beginning P-spec, or include all
subprocedures in the same source file
5)  If you don't want ALL modules of the service program to be callable by
other programs, you must create binder source (see the Sorcerer's guide),
and use the binder source on the CRTSRVPGM command.

As Jerry said, the Sorcerer's guide is the best source, but this might get
you started.

On 1/27/06, thomas <rpgguru2@xxxxxxxxxx> wrote:
>
> does anyone have a simple service program I could look at to start to
> understand them.  A list of rules of what has to happen would help.  Have
> figured out that you cannot read and write files in a SERVICE program. Or at
> least I think that is right. Thomas Burrows
>
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