[Coco] Os9 Intercept

[Gene Heskett]

On Tuesday 30 October 2012 09:38:48 Bill Pierce did opine:

> Thanks Aaron, I think that's what I need. The real problem is there's
> already an intercept running on the program that catches the BREAK key.
> Then my ML sub to connect to DW (inline, same program) sets up the
> intercept when it runs. I need to be able to read the intercept &
> vector data address BEFORE it makes the call, then I can restore it
> afterwards.
> 
> New question.. when you set the intercept.. do the calls stack, or does
> it just wipe the old intercept and create a new one? Example:
> 
> set intercept 1...
> program code..
> 
> set intercept 2
> program code..
> 
> signal
> jmp intercept 2..
> jmp intercept 1..
> return (RTI)
> 
> If it doesn't stack like this, then I can just reset the first intercept
> and it should be fine.
> 
> thnx
> Bill P
> 
Since the size of the PD area is fixed, its my understanding that only the 
last intercept set by the F$Icpt call will be executed when the signal 
comes in.  IOW they do not stack.  OTOH, since they don't stack, I also 
don't believe there is a limit other than your imagination. :)

> Music from the Tandy/Radio Shack Color Computer 2 & 3
> https://sites.google.com/site/dabarnstudio/
> Bill Pierce
> ooogalapasooo at aol.com
> 
> 
> 
> 
> -----Original Message-----
> From: Aaron Wolfe <aawolfe at gmail.com>
> To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>
> Sent: Tue, Oct 30, 2012 4:47 am
> Subject: Re: [Coco] Os9 Intercept
> 
> 
> You can get the current intercept settings for a process from it's
> process descriptor.  F$GPrDsc is one way, I think that works in user
> mode.  There may be others, I am no OS9 expert.  In the PD your
> intercept info is at +$36 but if you're using os9 defs you can use the
> pretty names:
> 
> P$Signal       RMB       1                   Signal Code $36
> P$SigVec       RMB       2                   Signal Intercept Vector
> P$SigDat       RMB       2                   Signal Intercept Data
> Address
> 
> hth
> -Aaron
> 
> On Tue, Oct 30, 2012 at 12:42 AM, Bill Pierce <ooogalapasooo at aol.com> 
wrote:
> > Hi Guys,
> > In OS9, how do you reset an Intercept back to default after a program
> > has set
> 
> it?
> 
> > I have a program that runs a function that uses a signal intercept.
> > When the
> 
> function is called, the F$Icpt is set. The program will be continuously
> running, but the intercept will no longer be needed until the same
> function is called again. The lines that set the intercept can be
> jumped over each time, but the intercept itself does not need to in
> operation unless within that function, as it interferes with the rest
> of the program. So, how would I go about resetting the intercept
> address to what it was before the change. I searched through both the
> "C" User's guide and the OS9 Tech Reference manual and only found
> reference to setting the intercept.
> 
> > So, is there some way to call before the intercept is set to get the
> > current
> 
> intercept address saved before I set the intercept?
> 
> > Thnx
> > Bill P
> > 
> > Music from the Tandy/Radio Shack Color Computer 2 & 3
> > https://sites.google.com/site/dabarnstudio/
> > Bill Pierce
> > ooogalapasooo at aol.com
> > 
> > 
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Cheers, Gene
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