extern size_t _dl_pagesize;  if (_dl_pagesize != 0) return _dl_pagesize;
if (GL(dl_pagesize) != 0) return GL(dl_pagesize);
__getpagesize (){  extern size_t _dl_pagesize;  if (_dl_pagesize != 0)    return _dl_pagesize;#ifdef	EXEC_PAGESIZE  return EXEC_PAGESIZE;#else	/* No EXEC_PAGESIZE.  */#ifdef	NBPG#ifndef	CLSIZE#define	CLSIZE	1#endif	/* No CLSIZE.  */  return NBPG * CLSIZE;#else	/* No NBPG.  */  return NBPC;#endif	/* NBPG.  */#endif	/* EXEC_PAGESIZE.  */}