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From: "Rod Pemberton" <dont_have AT bitbucket DOT cmm>
Newsgroups: comp.os.msdos.djgpp
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Subject: Re: TSR issues (with code)
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Date: Fri, 03 Feb 2006 23:27:11 GMT
To: djgpp AT delorie DOT com
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Reply-To: djgpp AT delorie DOT com


"Brad House" <brad AT mainstreetsoftworks DOT com> wrote in message
news:43E3884C DOT 8050308 AT mainstreetsoftworks DOT com...
> Ok, doing realmode reflection doesn't look like it's too bad then...
> And you suggest using _go32 function instead of __dpmi functions,
> so to chain the interrupt vector, how would that work, it seems as
> though there is no _chain_ routine, would I simply call the old
> dos realmode int's  pm_offset assuming the _go32_dpmi wrappers
> made such a routine for me?

Inside the new interrupt, you'll probably need to call
_go32_dpmi_simulate_fcall_iret() to chain.
IIRC, there are some other regs that can be used for a stack etc.

r->x.cs=old_dosidle_int.rm_segment;
r->x.ip=old_dosidle_int.rm_offset;
 _go32_dpmi_simulate_fcall_iret(&r);

> This is how I think it _should_
> look:
<snip>

That look very good to me.

This is probably fine due to implicit casting.
> new_dosidle_int.pm_offset = my_dosidle_handler;

Just in case, I have code similar to this:
new_dosidle_int.pm_offset = (unsigned long)&my_dosidle_handler;

I'll check what you wrote against some code of mine and see if I can get it
to work without a bunch of locking/nearptr stuff...


Rod Pemberton