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SubjectRe: [patch 7/8] fdmap v2 - implement sys_socket2
> I don't think it's a matter of versioning. Many userspace libraries 
> expects their fds to be compact (for many reasons - they use select, they
> use them to index 0-based arrays, etc...), and if the kernel suddendly
> starts returning values in the 1<<28 up arena, they sure won't be happy.
> So I believe that the correct way is that the caller specifically selects
> the feature, leaving the legacy fd allocation as default.

I don't understand the connection between this paragraph (with which I
agree) and the urge to add a ton of ugly syscall hacks. "Caller
specifically selects feature" - > prctl(). Libraries get unhappy ->
linker issue.
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