Study the SAA Concept if you find some documentation. Or refer to the OS F
Key handling and don't forget the option numbers.
-------- Ursprüngliche Nachricht --------
Von: Patrik Schindler <poc@xxxxxxxxxx>
Datum: So., 10. Aug. 2025, 23:40
An: RPG programming on IBM i <rpg400-l@xxxxxxxxxxxxxxxxxx>
Betreff: 5250 programming: F3, F12 and CALLed programs
Hello,
I'm rolling around this thought in my head for some time now and fail to
come up with a convenient solution. So I thought, I ask: How did you do
this, back in the days?
Assume an interactive application program is started from a menu. Within
this application program, the user triggers some action which CALLs a
secondary interactive program. The user eventually found what he
searched for, and decides to cancel the whole task.
As far as I understood, F12 means "go back one step", and F3 means "go
back further". Note: "further" is my term, I can't recall how IBM named
it.
Some time ago, there was a discussion about the invention of the S/38
CPF in the Midrange-Main list. There were some links to historic
documentation which in part was very enlightening to me. I found an
explanation about F3 meaning "go back to the last menu". At least that's
how I understood the text.
In the example above, the user would probably expect the F3 request to
put him back to the menu he started the first application program from.
So, to end a chain of application programs, the F3-Request needs to be
passed on to the respective calling program, making it aware of the
request, and making it end also. In turn the user's screen is displaying
the last menu he navigated to.
Now I wonder what is the proper way to make the calling application
aware about an ending request in a called program.
I have a guts feeling that this might be another case where I need to
face my nemesis: Messages. Something I repeatedly fail to grok. Maybe
I'm just too used to POSIX signals on Linux.
So if messages are the proper way to handle this, web links to examples
would be very helpful. Maybe I can utilize learning by doing.
Thanks!
:wq! PoC
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