text: #define SHMLBA 4096
  
  struct shmid_ds {
  	struct ipc_perm shm_perm;
  	time_t shm_atime;
  	time_t shm_dtime;
  	time_t shm_ctime;
  	size_t shm_segsz;
  	pid_t shm_cpid;
  	pid_t shm_lpid;
  	unsigned long shm_nattch;
  	unsigned long __unused[2];
  };
  
  struct shminfo {
  	unsigned long shmmax, shmmin, shmmni, shmseg, shmall, __unused[4];
  };
  
  struct shm_info {
  	int __used_ids;
  	unsigned long shm_tot, shm_rss, shm_swp;
  	unsigned long __swap_attempts, __swap_successes;
  };
  