sysdeps/unix/bsd/bsd4.4/kfreebsd/gethostid.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 current machine's Internet number.  */
  24 long int
  25 gethostid (void)
  26 {
  27   /* Fetch sysctl value of "kern.hostid".  */
  28   int request[2] = { CTL_KERN, KERN_HOSTID };
  29   int result;
  30   size_t result_len = sizeof (result);
  31
  32   if (__sysctl (request, 2, &result, &result_len, NULL, 0) < 0)
  33     /* Dummy result.  */
  34     return 0;
  35
  36   return result;
  37 }