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From: "Richard" <ts_swe_dpt AT yahoo DOT co DOT uk>
Newsgroups: comp.os.msdos.djgpp
References: <Pine DOT SUN DOT 3 DOT 91 DOT 1020204190535 DOT 14403C-100000 AT is>
Subject: Re: go32 wrapped interrupt handler returns register value ?
Date: Tue, 5 Feb 2002 15:27:46 -0000
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To: djgpp AT delorie DOT com
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> Take a look at the module exceptn.S in the library sources
> (djlsr203.zip): the DJGPP startup code already installs a PM handler for
> Int 24h, and that handler instructs DOS to fail the call.
>
> Note that some DPMI servers (notably, CWDPMI) catch Int 24h themselves
> and fail the call even before your application sees Int 24h.  See section
> 22.13 of the DJGPP FAQ list for more fun.

I found the place in CWSDPMI source module DPMISIM.ASM which returns al = 3,
but I was

I suspect that the only way to return a value from a C++ isr function is to
fiddle with the call stack taking note of what's inside the wrapper_common
structure in go32/gormcb.cpp file.

Either that or writing an isr in asm directly.