RE: UC - User Controlled opens

[Buck Calabro <mcalabro@xxxxxxxxxxxx>]

On Friday, October 02, 1998 1:48 AM, James W. Kilgore 
[SMTP:qappdsn@ibm.net] wrote:
> If a program -always- opens a particular file, IMHO, just let the system
> open
> it.  If a program has several files where, depending on what is passed 
to
> the
> program, only a minority of them are needed per call, you may choose to
> explicitly open /close them.  If the same program is called 
repetatively,
> unless
> you have a compelling reason to close a file, once opened, leave it that
> way.
>
> In any case, it's an "it depends" issue for UC.

There is one good reason to do UC opens in RPG: Error trapping.  If you 
let RPG do the implicit open and you get an I/O error (file locked by 
backups, etc.) then the default error handler will get control even if you 
have an INFSR for the file.  The only way I've found to trap this sort of 
I/O error is to do a user controlled open.

Buck Calabro
Commsoft, Albany, NY
mailto:mcalabro@commsoft.net

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