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Classics Forum

Re: Help for 4gl development

Posted By:
Date:


Sorry have not had to do this for 4GL. Oh. forgot you will need to have the
SIGALARM handler issue a SIGINT to break out of the INPUT to the ON INTERRUPT
clause.

See 'man signal' for the function to set up the signal handler for SIGALRM,
'man alarm' to set up the timed interrupt to the handler or to disable it by
setting the timer to zero, and 'man kill' to send the SIGINT from the SIGALRM
handler. This should not be particularly difficult. See the 4GL manuals for
constructing 4GL callable 'C' functions.

Art S. Kagel

----- Original Message -----
From: Subba Rao Sunkavalli <ssvsunkavalli@yahoo.com>
At: 2/ 3 12:03

> Hi,
>
> Thank you for your information.
> It's very interesting.
> Do you have any example programs / scripts.
> Could you please forward to me.
>
> Thanks in advance.
>
> Thanks
> Rao
> --- "ART KAGEL, BLOOMBERG/ 65E 55TH"
> <KAGEL@bloomberg.net> wrote:
> > Write a SIGALARM handler, a function to set the
> > alarm for 5 minutes designating
> > the new handler function, and a function to reset
> > the SIGALARM handler to
> > SIG_IGNORE all in 'C' but 4GL callable. Either link
> > them into your 4GL program
> > if you use C4gl or into the pcode runner if you use
> > R4GL or D4GL. On entry to
> > the 'screen' function's INPUT statement call the
> > alarm setup function, in any
> > after field logic in the INPUT FORM call the setup
> > function again to reset the
> > timer. On exit from the INPUT block disable the
> > SIGALARM with the SIG_IGNORE
> > function. If the alarm timer expires between fields
> > due to idleness the
> > SIGALARM handler will execute and it should set the
> > 4GL interrupt flag and
> > return. In the INPUT function trap the interrupt in
> > an ON clause and exit the
> > function gracefully, perhaps logging the event or
> > popping up a message box.
> >
> > Art S. Kagel
> >
> > ----- Original Message -----
> > From: Subbarao Su.... <ssvsunkavalli@yahoo.com>
> > At: 2/ 3 9:32
> >
> > > Informix 4GL tool is using for Development. One of
> > the program accepts various
> > > input fields in the program, finally on the
> > confirmation, it validates and
> > > update the data and back to previous menu.
> > >
> > > There is a situation to exit from the Input Screen
> > when the system is idle for
> > 5
> > > minutes,
> > > wherever the cursor is in place either at field
> > acceptance or at confirmation
> > > pop window.
> > >
> > > What is the best way to develop program for this ?
> > > Any help can be highly appreciated.
> > > thanks
> > >
> > > subbarao
> >
> >
>
>
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