pub unsafe extern "C" fn ip6addr_ntoa_r(
addr: *const ip6_addr_t,
buf: *mut c_char,
buflen: c_int,
) -> *mut c_charpub unsafe extern "C" fn ip6addr_ntoa_r(
addr: *const ip6_addr_t,
buf: *mut c_char,
buflen: c_int,
) -> *mut c_char