Function libc::getnameinfo

pub unsafe extern 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