pub extern "C" fn renameat2(
fn_ptr: Option<&extern "C" fn(c_int, *const c_char, c_int, *const c_char, c_uint) -> c_int>,
olddirfd: c_int,
oldpath: *const c_char,
newdirfd: c_int,
newpath: *const c_char,
flags: c_uint,
) -> c_int