Re: problems with program binding

["Steve Richter" <stephenrichter@xxxxxxxxx>]

On 12/8/06, Knezevic, Mihael <Mihael.Knezevic@xxxxxxxxxxx> wrote:
> hi,
>
> i got a little problem with the binding of programs. but first some
> background. we have a test and production environment on one machine.
> each has its own lib (we call it test and prod here for the discussion).
> both libs are in the libl in the order: first test then prod (the
> machine is a devel machine). we are using a global binding directory for
> binding.
>
> the case:
>
> i'm working on a serviceprogram. the serviceprogram exists in it's old
> form in the prod lib and in it's new form in the test lib. another
> developer is working on a program which uses some procedures from my
> serviceprogram. during the development phase everything is working fine.
> now he promotes the program to the prod lib and the program gets the
> signature of the serviceprogram in the prod lib. seems ok so far.
>
> but now he calls the program (which is in prod) and it brings an error
> (MCH4431). translation: Invalid programsignature.
>
> it seems that the program tries to call the procedures from the
> serviceprogram in test (which is in libl before prod).

it is not that it is trying to call the srvpgm in test, it is that
CRTPGM bound the program to the exports in the test service program.
When the program calls a procedure in a srvpgm it uses the export
number that existed at bind time. It is a good thing you got the
signature violation. Otherwise your program, since it is calling by
export number rather than name, would likely call a procedure in the
prod srvpgm you did not intend.   Bottom line is you have to learn
about signatures and binding source. It is not that hard and once you
know it you actually will understand srvpgms a lot better. That was my
experience, at least.

-Steve