[Coco] signal/intercept routine in Basic09

[Wayne Campbell]

I can't say what every signal the process expects to receive is, but I do 
know one. It's the signal for port closed. If the port I've opened in the 
irc client gets closed, ccirc does not know it and continues to try to write 
to the open path. Before that, the program drops into debug. If it was 
packed, it would just end the process.

I'm not certain that this is all I need to address, since at some point I 
want to add a windowing environment for the user interface, and will need to 
be dealing with whatever signals I can expect from that, like mouse clicks 
and such. Is there any such thing as a "generic" handler that will allow me 
to process all trappable signals not trapped with ON ERROR GOTO?

BTW, I do have an error trap, and the closed port signal bypasses it and 
goes straight to debug.

Wayne

----- Original Message ----- 
From: "Robert Gault" <robert.gault at worldnet.att.net>
To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
Sent: Saturday, January 23, 2010 4:31 PM
Subject: Re: [Coco] signal/intercept routine in Basic09


> Wayne Campbell wrote:
>> It seems strange that Basic09 includes ON ERROR GOTO for trapping errors, 
>> but does not include something like ON SIGNAL, OR INTERCEPT, or ON BREAK 
>> for trapping signals. Errors, not caught with ON ERROR GOTO cause Basic09 
>> to drop into debug mode. Signals also cause Basic09 to drop into debug 
>> mode. Why aren't they trappable? I don't know.
>>
>> I have been looking at F$Icpt. I have also looked in the C manual at 
>> intercept() and signal(). Since F$Icpt is the only system call I can 
>> find, and since signal() and intercept() are incompatible, I take that to 
>> mean both use the F$Icpt call, and deal with it differently.
>>
>> Has anyone here ever written a signal trap or intercept routine for 
>> Basic09? Does anyone here have a clue how to write one? I need to be able 
>> to trap all signals that are not fatal to the process. Of course, there 
>> are some that cannot be trapped, and that's OK, so long as I can trap the 
>> rest.
>>
>> Wayne
>>
>
> Wayne,
> It would help to know what is sending the signals to Basic09, what the 
> signals are going to report, and just how many of these are to be sent.
>
> Depending on the type of signals, there just might be a way to use ON 
> ERROR GOTO.
>
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