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. */
18 #if defined (HAVE_UNISTD_H)
20 # if defined (_SC_PAGESIZE)
21 # define getpagesize() sysconf(_SC_PAGESIZE)
23 # if defined (_SC_PAGE_SIZE)
24 # define getpagesize() sysconf(_SC_PAGE_SIZE)
25 # endif /* _SC_PAGE_SIZE */
26 # endif /* _SC_PAGESIZE */
29 #if !defined (getpagesize)
30 # ifdef HAVE_SYS_PARAM_H
31 # include <sys/param.h>
33 # if defined (PAGESIZE)
34 # define getpagesize() PAGESIZE
35 # else /* !PAGESIZE */
36 # if defined (EXEC_PAGESIZE)
37 # define getpagesize() EXEC_PAGESIZE
38 # else /* !EXEC_PAGESIZE */
40 # if !defined (CLSIZE)
43 # define getpagesize() (NBPG * CLSIZE)
46 # define getpagesize() NBPC
49 # endif /* !EXEC_PAGESIZE */
50 # endif /* !PAGESIZE */
51 #endif /* !getpagesize */
53 #if !defined (getpagesize)
54 # define getpagesize() 4096 /* Just punt and use reasonable value */