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SubjectRe: [PATCH] Fix queued SIGIO
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> 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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