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glibc  2.9
getpagesize.c
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00001 /* Copyright (C) 1991,1992,1995-1997,2000,2002,2004
00002    Free Software Foundation, Inc.
00003    This file is part of the GNU C Library.
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 
00023 #include <ldsodefs.h>
00024 
00025 /* Return the system page size.  */
00026 int
00027 __getpagesize ()
00028 {
00029   if (GLRO(dl_pagesize) != 0)
00030     return GLRO(dl_pagesize);
00031 
00032 #ifdef EXEC_PAGESIZE
00033   return EXEC_PAGESIZE;
00034 #else  /* No EXEC_PAGESIZE.  */
00035 #ifdef NBPG
00036 #ifndef       CLSIZE
00037 #define       CLSIZE 1
00038 #endif /* No CLSIZE.  */
00039   return NBPG * CLSIZE;
00040 #else  /* No NBPG.  */
00041   return NBPC;
00042 #endif /* NBPG.  */
00043 #endif /* EXEC_PAGESIZE.  */
00044 }
00045 libc_hidden_def (__getpagesize)
00046 weak_alias (__getpagesize, getpagesize)