| 1 | /* Emulate getpagesize on systems that lack it. |
| 2 | Copyright (C) 1986, 1992, 1995, 2001 Free Software Foundation, Inc. |
| 3 | |
| 4 | This file is part of GNU Emacs. |
| 5 | |
| 6 | GNU Emacs is free software; you can redistribute it and/or modify |
| 7 | it under the terms of the GNU General Public License as published by |
| 8 | the Free Software Foundation; either version 2, or (at your option) |
| 9 | any later version. |
| 10 | |
| 11 | GNU Emacs is distributed in the hope that it will be useful, |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | GNU General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU General Public License |
| 17 | along with GNU Emacs; see the file COPYING. If not, write to |
| 18 | the Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| 19 | Boston, MA 02111-1307, USA. */ |
| 20 | |
| 21 | #ifndef HAVE_GETPAGESIZE |
| 22 | |
| 23 | # ifdef VMS |
| 24 | # define getpagesize() 512 |
| 25 | # endif |
| 26 | |
| 27 | # ifdef HAVE_UNISTD_H |
| 28 | # include <unistd.h> |
| 29 | # endif |
| 30 | |
| 31 | # ifdef _SC_PAGESIZE |
| 32 | # define getpagesize() sysconf(_SC_PAGESIZE) |
| 33 | # else /* no _SC_PAGESIZE */ |
| 34 | # ifdef HAVE_SYS_PARAM_H |
| 35 | # include <sys/param.h> |
| 36 | # ifdef EXEC_PAGESIZE |
| 37 | # define getpagesize() EXEC_PAGESIZE |
| 38 | # else /* no EXEC_PAGESIZE */ |
| 39 | # ifdef NBPG |
| 40 | # define getpagesize() NBPG * CLSIZE |
| 41 | # ifndef CLSIZE |
| 42 | # define CLSIZE 1 |
| 43 | # endif /* no CLSIZE */ |
| 44 | # else /* no NBPG */ |
| 45 | # ifdef NBPC |
| 46 | # define getpagesize() NBPC |
| 47 | # else /* no NBPC */ |
| 48 | # ifdef PAGESIZE |
| 49 | # define getpagesize() PAGESIZE |
| 50 | # endif /* PAGESIZE */ |
| 51 | # endif /* no NBPC */ |
| 52 | # endif /* no NBPG */ |
| 53 | # endif /* no EXEC_PAGESIZE */ |
| 54 | # else /* no HAVE_SYS_PARAM_H */ |
| 55 | # define getpagesize() 8192 /* punt totally */ |
| 56 | # endif /* no HAVE_SYS_PARAM_H */ |
| 57 | # endif /* no _SC_PAGESIZE */ |
| 58 | |
| 59 | #endif /* no HAVE_GETPAGESIZE */ |