SG_SET
SG_SET(&conn->u.tcp.sgbuf[1], conn->u.tcp.response->data,
SG_SET(&newconn->u.tcp.sgbuf[0], newconn->u.tcp.lenbuf, 4);
SG_SET(&newconn->u.tcp.sgbuf[1], 0, 0);
SG_SET(&state->x.out.sgbuf[0], state->x.out.msg_len_buf, 4);
SG_SET(&state->x.out.sgbuf[1], message->data, message->length);
SG_SET(&state->x.out.sgbuf[0], message->data, message->length);
SG_SET(&state->x.out.sgbuf[1], 0, 0);
SG_SET(&state->x.out.sgbuf[1], 0, 0);