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macOS allows it as of 10.5, but it is not exposed to the user. The "Time Machine" backup tool built into macOS relies on it. AT&T UNIX System V allowed it for

• masklinn 5y ago
  > macOS allows it as of 10.5, but it is not exposed to the user. Depends what you mean by "not exposed to the user": while ln(1) can't create directory hardlinks it works fine via link(2) (on HFS+), with the limitation that hardlinked directories can't be siblings. And of course directory hardlinks are fucking terrifying because `unlink(1)` will not work, and `rm(1)` will recursively remove directory contents, so you need to go through `unlink(2)` in C.