res_nsend
int res_nsend(res_state, const u_char *, int, u_char *, int);
n = res_nsend(res, buf, n, answer, anslen);
return (res_nsend(statp, buf, buflen, ans, anssiz));
n = res_nsend(statp, req, n, resp, NS_MAXMSG);
n = res_nsend(statp, buf, n, answer, anslen);
n = res_nsend(statp, packet, n, answer, sizeof answer);