sysdeps/unix/sysv/linux/getpagesize.c

   1 /* Copyright (C) 1991,1992,1995-1997,2000,2002 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library 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 GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #include <unistd.h>
  20 #include <sys/param.h>
  21
  22 #include <ldsodefs.h>
  23
  24 /* Return the system page size.  */
  25 int
  26 __getpagesize ()
  27 {
  28   if (GL(dl_pagesize) != 0)
  29     return GL(dl_pagesize);
  30
  31 #ifdef  EXEC_PAGESIZE
  32   return EXEC_PAGESIZE;
  33 #else   /* No EXEC_PAGESIZE.  */
  34 #ifdef  NBPG
  35 #ifndef CLSIZE
  36 #define CLSIZE  1
  37 #endif  /* No CLSIZE.  */
  38   return NBPG * CLSIZE;
  39 #else   /* No NBPG.  */
  40   return NBPC;
  41 #endif  /* NBPG.  */
  42 #endif  /* EXEC_PAGESIZE.  */
  43 }
  44 libc_hidden_def (__getpagesize)
  45 weak_alias (__getpagesize, getpagesize)