lib/getpagesize.h

   1 /* Emulate getpagesize on systems that lack it.
   2    Copyright (C) 1999, 2000, 2004 Free Software Foundation, Inc.
   3
   4    This program is free software; you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 2, or (at your option)
   7    any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program; if not, write to the Free Software
  16    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  17    USA.  */
  18
  19 #ifndef HAVE_GETPAGESIZE
  20
  21 #ifdef HAVE_UNISTD_H
  22 # include <unistd.h>
  23 #endif
  24
  25 #if !defined getpagesize && defined _SC_PAGESIZE
  26 # if !(defined VMS && __VMS_VER < 70000000)
  27 #  define getpagesize() sysconf (_SC_PAGESIZE)
  28 # endif
  29 #endif
  30
  31 #if !defined getpagesize && defined VMS
  32 # ifdef __ALPHA
  33 #  define getpagesize() 8192
  34 # else
  35 #  define getpagesize() 512
  36 # endif
  37 #endif
  38
  39 /* This is for BeOS.  */
  40 #if !defined getpagesize && HAVE_OS_H
  41 # include <OS.h>
  42 # if defined B_PAGE_SIZE
  43 #  define getpagesize() B_PAGE_SIZE
  44 # endif
  45 #endif
  46
  47 #if !defined getpagesize && HAVE_SYS_PARAM_H
  48 # include <sys/param.h>
  49 # ifdef EXEC_PAGESIZE
  50 #  define getpagesize() EXEC_PAGESIZE
  51 # else
  52 #  ifdef NBPG
  53 #   ifndef CLSIZE
  54 #    define CLSIZE 1
  55 #   endif
  56 #   define getpagesize() (NBPG * CLSIZE)
  57 #  else
  58 #   ifdef NBPC
  59 #    define getpagesize() NBPC
  60 #   endif
  61 #  endif
  62 # endif
  63 #endif
  64
  65 #endif /* not HAVE_GETPAGESIZE */