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@erincandescent cgroupfs actually exposes the cgroupid via ntha() and obha(). So yes, there's prior art for doing the same in pidfs. But it's a bit weird, because unlike cgroupfs pidfs is not an fs you can mount, hence you don't really have anything to invoke obha() on. You'd probably have to get a pidfd on your own pid first, before you can use it to use obha() to get to the pidfd you actually want to get to.