Function libc::getnameinfo

pub unsafe extern "C" fn getnameinfo(
    sa: *const sockaddr, 
    salen: socklen_t, 
    host: *mut c_char, 
    hostlen: socklen_t, 
    serv: *mut c_char, 
    sevlen: socklen_t, 
    flags: c_int
) -> c_int