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 2, 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) */