CHECK_SEMCTL (&arg, semid, cmd));
CHECK_SEMCTL (&arg, semid, cmd)->array);
__new_semctl (int semid, int semnum, int cmd, ...){  union semun arg;  va_list ap;  va_start (ap, cmd);  /* Get the argument.  */  arg = va_arg (ap, union semun);  va_end (ap);#if __ASSUME_32BITUIDS > 0  return INLINE_SYSCALL (semctl, 4, semid, semnum, cmd | __IPC_64,			 CHECK_SEMCTL (&arg, semid, cmd | __IPC_64));#else  switch (cmd) {    case SEM_STAT:    case IPC_STAT:    case IPC_SET:      break;    default:      return INLINE_SYSCALL (semctl, 4, semid, semnum, cmd,			     CHECK_SEMCTL (&arg, semid, cmd));  }  {    int save_errno = errno, result;    struct __old_semid_ds old;    struct semid_ds *buf;    /* Unfortunately there is no way how to find out for sure whether       we should use old or new semctl.  */    result = INLINE_SYSCALL (semctl, 4, semid, semnum, cmd | __IPC_64,			     CHECK_SEMCTL (&arg, semid, cmd | __IPC_64));    if (result != -1 || errno != EINVAL)      return result;    __set_errno(save_errno);    buf = arg.buf;    arg.buf = (struct semid_ds *)&old;    if (cmd == IPC_SET)      {	old.sem_perm.uid = buf->sem_perm.uid;	old.sem_perm.gid = buf->sem_perm.gid;	old.sem_perm.mode = buf->sem_perm.mode;	if (old.sem_perm.uid != buf->sem_perm.uid ||	    old.sem_perm.gid != buf->sem_perm.gid)	  {	    __set_errno (EINVAL);	    return -1;	  }      }    result = INLINE_SYSCALL (semctl, 4, semid, semnum, cmd,			     CHECK_SEMCTL (&arg, semid, cmd));    if (result != -1 && cmd != IPC_SET)      {	memset(buf, 0, sizeof(*buf));	buf->sem_perm.__key = old.sem_perm.__key;	buf->sem_perm.uid = old.sem_perm.uid;	buf->sem_perm.gid = old.sem_perm.gid;	buf->sem_perm.cuid = old.sem_perm.cuid;	buf->sem_perm.cgid = old.sem_perm.cgid;	buf->sem_perm.mode = old.sem_perm.mode;	buf->sem_perm.__seq = old.sem_perm.__seq;	buf->sem_otime = old.sem_otime;	buf->sem_ctime = old.sem_ctime;	buf->sem_nsems = old.sem_nsems;      }    return result;  }#endif}