src/getpagesize.h

   1 /* Emulate getpagesize on systems that lack it.
   2    Copyright (C) 1986, 1992, 1995, 2001, 2002, 2003, 2004,
   3                  2005, 2006, 2007 Free Software Foundation, Inc.
   4
   5 This file is part of GNU Emacs.
   6
   7 GNU Emacs is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 3, or (at your option)
  10 any later version.
  11
  12 GNU Emacs is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GNU Emacs; see the file COPYING.  If not, write to
  19 the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  20 Boston, MA 02110-1301, USA.  */
  21
  22 #ifndef HAVE_GETPAGESIZE
  23
  24 # ifdef VMS
  25 #  define getpagesize() 512
  26 # endif
  27
  28 # ifdef HAVE_UNISTD_H
  29 #  include <unistd.h>
  30 # endif
  31
  32 # ifdef _SC_PAGESIZE
  33 #  define getpagesize() sysconf(_SC_PAGESIZE)
  34 # else /* no _SC_PAGESIZE */
  35 #  ifdef HAVE_SYS_PARAM_H
  36 #   include <sys/param.h>
  37 #   ifdef EXEC_PAGESIZE
  38 #    define getpagesize() EXEC_PAGESIZE
  39 #   else /* no EXEC_PAGESIZE */
  40 #    ifdef NBPG
  41 #     define getpagesize() NBPG * CLSIZE
  42 #     ifndef CLSIZE
  43 #      define CLSIZE 1
  44 #     endif /* no CLSIZE */
  45 #    else /* no NBPG */
  46 #     ifdef NBPC
  47 #      define getpagesize() NBPC
  48 #     else /* no NBPC */
  49 #      ifdef PAGESIZE
  50 #       define getpagesize() PAGESIZE
  51 #      endif /* PAGESIZE */
  52 #     endif /* no NBPC */
  53 #    endif /* no NBPG */
  54 #   endif /* no EXEC_PAGESIZE */
  55 #  else /* no HAVE_SYS_PARAM_H */
  56 #   define getpagesize() 8192   /* punt totally */
  57 #  endif /* no HAVE_SYS_PARAM_H */
  58 # endif /* no _SC_PAGESIZE */
  59
  60 #endif /* no HAVE_GETPAGESIZE */
  61
  62 /* arch-tag: ff6206e3-97e2-4763-923a-e84bf28eabbc
  63    (do not change this comment) */