#define SHMLBA 4096 struct shmid_ds { struct ipc_perm shm_perm; size_t shm_segsz; time_t shm_atime; int __unused1; time_t shm_dtime; int __unused2; time_t shm_ctime; int __unused3; pid_t shm_cpid; pid_t shm_lpid; unsigned long shm_nattch; unsigned long __pad1; unsigned long __pad2; };