From:	"Charles Sandmann" <sandmann AT clio DOT rice DOT edu>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: Accesing real mode services....
Date:	Wed, 14 Nov 2001 10:20:56
Organization:	Aspen Technology, Inc.
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Message-ID:	<3bf24588.sandmann@clio.rice.edu>
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> I've been writing a application which uses a packet driver to talk to the
> network card, ive been able to pass instructions to the packet driver
> through the registers using int86x command but the problem starts when i
> send the packet driver a pointer (es:di / code segment:offset) to one of my
> programmes functions, when it calls it back teh whole thing just crashes,
> without error message. Is this because it is a real mode service trying to
> call my protected programme? Is there anyway to call the interrupt and pass
> the pointer from my programme so it does not do this?

You would need to allocate a real mode callback function from DPMI and 
pass the callback to the packet driver.  Look in dpmi.h, in particular
the functions _go32_dpmi_allocate_real_mode_callback*

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