#define SHMLBA 4096
struct shmid_ds
{
struct ipc_perm shm_perm;
size_t shm_segsz;
time_t shm_atime;
time_t shm_dtime;
time_t shm_ctime;
pid_t shm_cpid;
pid_t shm_lpid;
unsigned long shm_nattch;
unsigned long __pad1;
unsigned long __pad2;
};