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'it would cause a massive backward-compatibility problem to switch to something other than an integer.'

lol. of course.

Suggestion numero two. A dedicated syscall for additional syscalls that has a dedicated parameter for a GUID. We can add a third level in 2050 or so.

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Registering paths in /dev, /proc, or /sys seems like the way to go. Slightly slower than a syscall, because the kernel has to do text comparison with the path (such as /dev/foobar) you're reading/writing/ioctling.

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