[Coco] signal/intercept routine in Basic09

[Wayne Campbell]

Apparently, ON ERROR GOTO doesn't like 4. I opened a window, ran a test prog 
that just ran a loop and reacted to ON ERROR GOTO. When I sent the signal 4 
to the process from the other window (used send -1 <proc>), Basic09 dropped 
into debug instead of going thru the error trap.

Wayne

----- Original Message ----- 
From: "Christopher Hawks" <chawks at dls.net>
To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
Sent: Saturday, January 23, 2010 7:36 PM
Subject: Re: [Coco] signal/intercept routine in Basic09


> Wayne Campbell said the following on 01/23/2010 07:59 PM:
>> This sounds like a modification to the way drivewire sends signals?
>
> Standard OS9 signaling. Drivewire sends a Hangup signal.
>
>     lda       P$ID,x Process to send to
>     ldb       #S$HUP    Signal to send ( 4 )
>     os9       F$Send    doit
>
>> ----- 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 5:52 PM
>> Subject: Re: [Coco] signal/intercept routine in Basic09
>>
>>
>>> Aaron Wolfe wrote:
>>>> It's probably worth noting that the "port closed" signal is not a part
>>>> of standard OS-9, it is a feature of the DriveWire additions we're
>>>> working on.  The signal's value is 4.  It is sent to a process when
>>>> the remote end of a TCPIP connection closes.
>>>>
>>>
>>> For what it is worth, Basic09 would trap the error 4.
>>>  ON ERROR GOTO 100
>>>  ERROR 4
>>>  END
>>> 100 PRINT"The error was caught."
>>>
>>> When this is run, the message is printed. Now the manual indicates that 
>>> there is no real difference between signals and errors. Errors are just 
>>> specific signals. So, if the signal to be caught is coming from 
>>> Drivewire, it does not seem to be getting through to Basic09. That's 
>>> assuming error trapping as above is being used.
>>>
>>> It may mean that using syscall to set up an intercept may not work 
>>> either.
>>>
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>>
>>
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>
>
> -- 
> Christopher R. Hawks
> HAWKSoft
> ---------------------------------------------------------
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