1struct semid_ds {
 2	struct ipc_perm sem_perm;
 3	time_t sem_otime;
 4	long __unused1;
 5	time_t sem_ctime;
 6	long __unused2;
 7	unsigned short sem_nsems;
 8	char __sem_nsems_pad[sizeof(long)-sizeof(short)];
 9	long __unused3;
10	long __unused4;
11};