&reftitle.constants; &extension.constants;

`XATTR_ROOT` (`int`)

- Set attribute in root (trusted) namespace. Requires root privileges.

`XATTR_DONTFOLLOW` (`int`)

- Do not follow the symbolic link but operate on symbolic link itself.

`XATTR_CREATE` (`int`)

- Function will fail if extended attribute already exists.

`XATTR_REPLACE` (`int`)

- Function will fail if extended attribute doesn't exist.