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wishlist: add AT_EMPTY_PATH to openat() #48

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brauner merged 1 commit into from
Feb 8, 2026
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wishlist: add AT_EMPTY_PATH to openat() #48

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13 changes: 13 additions & 0 deletions README.md
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Expand Up @@ -697,6 +697,19 @@ tells userspace that there was an fd, but it was not allowed through.

**Use-Case:** Any code that wants to use `SCM_RIGHTS` properly.

### `AT_EMPTY_PATH` support for `openat()` and `openat2()`

To get an operable version of an `O_PATH` file descriptors, it is
possible to use `openat(fd, ".", O_DIRECTORY)` for directories, but
other files currently require going through
`open("/proc/<pid>/fd/<nr>")` which depends on a functioning `procfs`.

FreeBSD already has `O_EMPTY_PATH` for `openat`, while `fstatat` and
similar functions have `AT_EMPTY_PATH`.

**Use-Case:** When dealing with `O_PATH` file descriptors, allow
re-opening an operable version without the need of `procfs`.

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## Finished Items
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