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glibc  2.9
getpagesize.c
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00001 /* Copyright (C) 1999, 2000, 2001, 2002, 2004 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003 
00004    The GNU C Library is free software; you can redistribute it and/or
00005    modify it under the terms of the GNU Lesser General Public
00006    License as published by the Free Software Foundation; either
00007    version 2.1 of the License, or (at your option) any later version.
00008 
00009    The GNU C Library is distributed in the hope that it will be useful,
00010    but WITHOUT ANY WARRANTY; without even the implied warranty of
00011    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012    Lesser General Public License for more details.
00013 
00014    You should have received a copy of the GNU Lesser General Public
00015    License along with the GNU C Library; if not, write to the Free
00016    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00017    02111-1307 USA.  */
00018 
00019 #include <assert.h>
00020 #include <unistd.h>
00021 #include <sys/param.h>
00022 
00023 #include <ldsodefs.h>
00024 #include <sysdep.h>
00025 #include <sys/syscall.h>
00026 
00027 /* Return the system page size.  The return value will depend on how
00028    the kernel is configured.  A program must use this call to
00029    determine the page size to ensure proper alignment for calls such
00030    as mmap and friends.  --davidm 99/11/30 */
00031 
00032 int
00033 __getpagesize ()
00034 {
00035   assert (GLRO(dl_pagesize) != 0);
00036   return GLRO(dl_pagesize);
00037 }
00038 libc_hidden_def (__getpagesize)
00039 weak_alias (__getpagesize, getpagesize)