sock_txtime
struct sock_txtime sk_txtime;
if (optlen != sizeof(struct sock_txtime)) {
sizeof(struct sock_txtime))) {
struct sock_txtime txtime;
struct sock_txtime txtime_on = {
struct sock_txtime opt = { .clockid = CLOCK_TAI };
struct sock_txtime so_txtime = {
struct sock_txtime so_txtime_val = { .clockid = cfg_clockid };
struct sock_txtime so_txtime_val_read = { 0 };