Good point. I didn't find exact information unfortunately. Just this one SO discussion: https://unix.stackexchange.com/questions/356302/sticky-bit-and-socket-files-in-xdg-runtime-dir

That suggests that 1) the 6h requirement applies to real files (and I tend to follow since the spec makes a distinction between files and file objects in the same paragraph), and 2) no implementation actually implements the periodic cleanup (which is a MAY requirement).

On the other hand, the spec guarantees that $XDG_RUNTIME_DIR itself exists until the last logout.

So given that and that the spec expressively tells to put sockets in that directory, I would say it's not an issue to worry about.

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