sysdeps/mach/hurd/gethostid.c

   1 /* Copyright (C) 1991-2024 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    <https://www.gnu.org/licenses/>.  */
  17
  18 #include <unistd.h>
  19 #include <hurd.h>
  20 #include "hurdhost.h"
  21
  22 /* Return the current machine's Internet number.  */
  23 long int
  24 gethostid (void)
  25 {
  26   /* The hostid is just the contents of the file /etc/hostid,
  27      kept as text of hexadecimal digits.  */
  28   /* XXX this is supposed to come from the hardware serial number */
  29   char buf[8];
  30   ssize_t n = _hurd_get_host_config ("/etc/hostid", buf, sizeof buf);
  31   if (n < 0)
  32     return -1;
  33   return strtol (buf, NULL, 16);
  34 }