From: "Mark Usher" <marku AT magnet DOT at>
Newsgroups: comp.os.msdos.djgpp
Subject: a complication with real mode function callback.
Date: Thu, 15 Apr 1999 22:14:46 +0200
Organization: magnet Gesellschaft für digitale Kommunikation m.b.H
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To: djgpp AT delorie DOT com
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Reply-To: djgpp AT delorie DOT com

I'm wondering if anyone can help me clear this up. I have a driver that
needs a to call a real mode function as an event handler.
That is easy enough after reading the FAQ - many thanks to all concerned
there.

The definition I have for the event handler is this.
On entry DS:DX points to the start of an event handler. The first 8 bytes
are reserved and will be filled in by the driver.
0-3   Pointer to next handler code part (offset 8)
4-7   Pointer to previous handler (offset 0)
8+    Executable code

The question is...
How can I be sure of reserving exactly 8 bytes at the start of my event
handler that I pass with go32_dpmi_allocate_real_mode_callback_retf ?
Due to the stub, wrapper etc I thought I'd better post the question for some
more informed suggestons.

Mark
marku AT magnet DOT at