From linux-kernel  Mon Sep 18 10:26:27 2000
From: Alan Cox <alan () lxorguk ! ukuu ! org ! uk>
Date: Mon, 18 Sep 2000 10:26:27 +0000
To: linux-kernel
Subject: Re: [PATCH] Fix queued SIGIO
X-MARC-Message: https://marc.info/?l=linux-kernel&m=96927319113503

> The problem is really that SI_SIGIO is negative, but it should be positive
> to make SI_FROMUSER return false on it. 
> 
> Changing it would unfortunately break binary compatibility. This patch

Why ?

> It'll break programs that try to send SI_SIGIO (=-5) signals from userspace,
> but I think that is ok.

Why not just add SI_KERNSIGINFO ..  and use that ?
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