1  /* Analogous to kernel struct shmid64_ds used on shmctl.  */
       2  struct kernel_shmid64_ds
       3  {
       4    struct ipc_perm shm_perm;		/* operation permission struct */
       5    unsigned long int shm_atime_high;
       6    unsigned long int shm_atime;		/* time of last shmat() */
       7    unsigned long int shm_dtime_high;
       8    unsigned long int shm_dtime;		/* time of last shmdt() */
       9    unsigned long int shm_ctime_high;
      10    unsigned long int shm_ctime;		/* time of last change by shmctl() */
      11    unsigned long int __pad;
      12    size_t shm_segsz;			/* size of segment in bytes */
      13    __pid_t shm_cpid;			/* pid of creator */
      14    __pid_t shm_lpid;			/* pid of last shmop */
      15    shmatt_t shm_nattch;		/* number of current attaches */
      16    unsigned long int __unused1;
      17    unsigned long int __unused2;
      18  };