extern size_t _dl_pagesize;
__getpagesize (){  extern size_t _dl_pagesize;#ifdef __NR_getpagesize  int result;#endif  if (_dl_pagesize != 0)    return _dl_pagesize;#ifdef __NR_getpagesize  result = INLINE_SYSCALL (getpagesize, 0);  /* The only possible error is ENOSYS.  */  if (result != -1)    return result;#endif  return 4096;}