struct semid_ds {
  struct ipc_perm sem_perm;
  time_t sem_otime;
  time_t __unused1;
  time_t sem_ctime;
  time_t __unused2;
#if __BYTE_ORDER == __LITTLE_ENDIAN
  unsigned short sem_nsems;
  char __sem_nsems_pad[sizeof(time_t) - sizeof(short)];
#else
  char __sem_nsems_pad[sizeof(time_t) - sizeof(short)];
  unsigned short sem_nsems;
#endif
  time_t __unused3;
  time_t __unused4;
};