Back to index

glibc  2.9
getpagesize.c
Go to the documentation of this file.
00001 /* Copyright (C) 1997, 2002, 2003, 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 <unistd.h>
00020 #include <sys/param.h>
00021 #include <ldsodefs.h>
00022 #include <sysdep.h>
00023 
00024 /* Return the system page size.  This value will either be 4k or 8k depending
00025    on whether or not we are running on Sparc v9 machine.  */
00026 
00027 /* If we are not a static program, this value is collected from the system
00028    via the AT_PAGESZ auxiliary argument.  If we are a static program, we
00029    use the getpagesize system call.  */
00030 
00031 int
00032 __getpagesize ()
00033 {
00034   int ret = GLRO(dl_pagesize);
00035   if (ret == 0)
00036     {
00037       INTERNAL_SYSCALL_DECL (err);
00038       ret = INTERNAL_SYSCALL (getpagesize, err, 0);
00039 #ifndef SHARED
00040       GLRO(dl_pagesize) = ret;
00041 #endif
00042     }
00043   return ret;
00044 }
00045 libc_hidden_def (__getpagesize)
00046 weak_alias (__getpagesize, getpagesize)