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glibc  2.9
getpagesize.c
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00001 /* Copyright (C) 2000, 2002, 2003, 2004 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003    Contributed by Andreas Schwab <schwab@suse.de>.
00004 
00005    The GNU C Library is free software; you can redistribute it and/or
00006    modify it under the terms of the GNU Lesser General Public
00007    License as published by the Free Software Foundation; either
00008    version 2.1 of the License, or (at your option) any later version.
00009 
00010    The GNU C Library is distributed in the hope that it will be useful,
00011    but WITHOUT ANY WARRANTY; without even the implied warranty of
00012    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013    Lesser General Public License for more details.
00014 
00015    You should have received a copy of the GNU Lesser General Public
00016    License along with the GNU C Library; if not, write to the Free
00017    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00018    02111-1307 USA.  */
00019 
00020 #include <unistd.h>
00021 #include <sys/param.h>
00022 #include <errno.h>
00023 
00024 #include <ldsodefs.h>
00025 #include <sysdep.h>
00026 #include <sys/syscall.h>
00027 
00028 /* Return the system page size.  */
00029 int
00030 __getpagesize ()
00031 {
00032 #ifdef __NR_getpagesize
00033   int result;
00034 #endif
00035 
00036   if (GLRO(dl_pagesize) != 0)
00037     return GLRO(dl_pagesize);
00038 
00039 #ifdef __NR_getpagesize
00040   INTERNAL_SYSCALL_DECL (err);
00041   result = INTERNAL_SYSCALL (getpagesize, err, 0);
00042   /* The only possible error is ENOSYS.  */
00043   if (!INTERNAL_SYSCALL_ERROR_P (result, err))
00044     return result;
00045 #endif
00046 
00047   return 4096;
00048 }
00049 libc_hidden_def (__getpagesize)
00050 weak_alias (__getpagesize, getpagesize)