F_SEAL_FUTURE_WRITE
#define F_SEAL_ANY_WRITE (F_SEAL_WRITE|F_SEAL_FUTURE_WRITE)
|F_SEAL_WRITE|F_SEAL_FUTURE_WRITE)
if (except & ~(F_SEAL_WRITE|F_SEAL_FUTURE_WRITE)) {
RL(fcntl(fd, F_ADD_SEALS, F_SEAL_FUTURE_WRITE));
test_all_seals_except(fd, F_SEAL_FUTURE_WRITE);
RL(fcntl(fd, F_ADD_SEALS, F_SEAL_FUTURE_WRITE));
seal_yet = p_memfd_seal(seal_yet, mfd.mfd_seals, F_SEAL_FUTURE_WRITE, "F_SEAL_FUTURE_WRITE");