sysdeps/unix/bsd/bsd4.4/kfreebsd/getpagesize.c

   1 /* Copyright (C) 2002 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Bruno Haible <bruno@clisp.org>, 2002.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <unistd.h>
  21 #include <sys/sysctl.h>
  22
  23 /* Return the system page size.  */
  24 int
  25 __getpagesize (void)
  26 {
  27   static int cached_pagesize /* = 0 */;
  28
  29   if (cached_pagesize == 0)
  30     {
  31       /* Fetch sysctl value of "hw.pagesize".  */
  32       int request[2] = { CTL_HW, HW_PAGESIZE };
  33       size_t result_len = sizeof (cached_pagesize);
  34
  35       if (__sysctl (request, 2, &cached_pagesize, &result_len, NULL, 0) < 0)
  36         return -1;
  37     }
  38   return cached_pagesize;
  39 }
  40 libc_hidden_def (__getpagesize)
  41
  42 weak_alias (__getpagesize, getpagesize)