1 /* Emulation of getpagesize() for systems that need it.
2 Copyright (C) 1991 Free Software Foundation, Inc.
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 of the License, or
7 (at your option) any later version.
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.
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., 675 Mass Ave, Cambridge, MA 02139, USA. */
19 extern size_t getpagesize __P ((void));
20 # if !defined (HAVE_GETPAGESIZE)
21 # define HAVE_GETPAGESIZE
22 # endif /* !HAVE_GETPAGESIZE */
25 #if !defined (HAVE_GETPAGESIZE) && defined (HAVE_UNISTD_H)
27 # if defined (_SC_PAGESIZE)
28 # define getpagesize() sysconf(_SC_PAGESIZE)
29 # endif /* _SC_PAGESIZE */
32 #if !defined (HAVE_GETPAGESIZE)
33 # include <sys/param.h>
34 # if defined (PAGESIZE)
35 # define getpagesize() PAGESIZE
36 # else /* !PAGESIZE */
37 # if defined (EXEC_PAGESIZE)
38 # define getpagesize() EXEC_PAGESIZE
39 # else /* !EXEC_PAGESIZE */
41 # if !defined (CLSIZE)
44 # define getpagesize() (NBPG * CLSIZE)
47 # define getpagesize() NBPC
50 # endif /* !EXEC_PAGESIZE */
51 # endif /* !PAGESIZE */
52 #endif /* !getpagesize */
54 #if !defined (HAVE_GETPAGESIZE) && !defined (getpagesize)
55 # define getpagesize() 4096 /* Just punt and use reasonable value */
56 #endif /* !HAVE_GETPAGESIZE && !getpagesize */