sysdeps/mach/hurd/gethostid.c

   1 /* Copyright (C) 1991, 92, 93, 94, 96 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 Library General Public License as
   6 published by the Free Software Foundation; either version 2 of the
   7 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 Library General Public License for more details.
  13
  14 You should have received a copy of the GNU Library General Public
  15 License along with the GNU C Library; see the file COPYING.LIB.  If
  16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  17 Cambridge, MA 02139, USA.  */
  18
  19 #include <ansidecl.h>
  20 #include <unistd.h>
  21 #include <hurd.h>
  22 #include "hurdhost.h"
  23
  24 /* Return the current machine's Internet number.  */
  25 long int
  26 DEFUN_VOID(gethostid)
  27 {
  28   /* The hostid is just the contents of the file /etc/hostid,
  29      kept as text of hexadecimal digits.  */
  30   char buf[8];
  31   ssize_t n = _hurd_get_host_config ("/etc/hostid", buf, sizeof buf);
  32   if (n < 0)
  33     return -1;
  34   return strtol (buf, NULL, 16);
  35 }