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Date: Wed, 11 Apr 2012 22:35:20 -0400
From: Rich Felker <>
Subject: Re: Compatability: missing sys/vm86.h

On Tue, Apr 10, 2012 at 01:00:24PM -0700, Isaac Dunham wrote:
> sys/vm86.h is largely a wrapper for asm/vm86.h from linux-libc-dev, but
> provides one other function (prototype per man 2 vm86): 
> int vm86(unsigned long fn, struct vm86plus_struct *v86);
> There are no feature test macros required.
> This is needed for some versions of Xvesa/Xfbdev, as well as dev86,
> dosemu, and a number of other programs.

Hmm, I recently (essentially) rejected a request to include sys/io.h
(legacy 16bit x86 port io) on the basis that it has no modern use and
is machine-specific. However vm86 is a little bit different since it's
a syscall.. and dosemu, while old and ugly, may be useful to some
people. Xfbdev using vm86 is just broken, but since there do seem to
be valid uses, I think this could potentially be added... and it might
call on me to rethink the rejection of sys/io.h.


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