Function renameat2 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn renameat2(
    old_dir: c_int,
    old_path: *const c_char,
    new_dir: c_int,
    new_path: *const c_char,
    flags: c_uint,
) -> c_int

See https://www.man7.org/linux/man-pages/man2/rename.2.html.

Non-POSIX. Seems to be a GNU extension.