sysvipc_shmat
return (sysvipc_shmat(shmid, addr, flag));
shmaddr = sysvipc_shmat(msqid, NULL, 0);
shmaddr = sysvipc_shmat(semid, NULL, 0);
addr = sysvipc_shmat(undoid, NULL, 0);
undos = sysvipc_shmat(data->shmid, NULL, 0);
void *sysvipc_shmat(int, const void *, int);