sysdeps/unix/getpagesize.c

   1 /* Copyright (C) 1991-2017 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, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <unistd.h>
  19 #include <sys/param.h>
  20
  21 /* Return the system page size.  */
  22 int
  23 __getpagesize (void)
  24 {
  25 #ifdef  EXEC_PAGESIZE
  26   return EXEC_PAGESIZE;
  27 #else   /* No EXEC_PAGESIZE.  */
  28 #ifdef  NBPG
  29 #ifndef CLSIZE
  30 #define CLSIZE  1
  31 #endif  /* No CLSIZE.  */
  32   return NBPG * CLSIZE;
  33 #else   /* No NBPG.  */
  34   return NBPC;
  35 #endif  /* NBPG.  */
  36 #endif  /* EXEC_PAGESIZE.  */
  37 }
  38 libc_hidden_def (__getpagesize)
  39 weak_alias (__getpagesize, getpagesize)