PATH_READLINK

;;; Read the contents of a symbolic link.
  ;;; Note: This is similar to `readlinkat` in POSIX. If `buf` is not large
  ;;; enough to contain the contents of the link, the first `buf_len` bytes will be
  ;;; be written to `buf`.
  (@interface func (export "path_readlink")
    (param $fd $fd)
    ;;; The path of the symbolic link from which to read.
    (param $path string)
    ;;; The buffer to which to write the contents of the symbolic link.
    (param $buf (@witx pointer u8))
    (param $buf_len $size)
    ;;; The number of bytes placed in the buffer.
    (result $error (expected $size (error $errno)))
  )