[Coco] signal/intercept routine in Basic09

[Christopher Hawks]

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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