1  /* Copyright (C) 1993-2023 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  #include <_itoa.h>
      22  
      23  /* Set the current machine's Internet number to ID.
      24     This call is restricted to the super-user.  */
      25  /* XXX should be __sethostid?
      26         isn't hostid supposed to be hardwired and unchangeable? */
      27  int
      28  sethostid (long int id)
      29  {
      30    char buf[8], *bp;
      31    ssize_t n;
      32  
      33    /* The hostid is kept in the file /etc/hostid,
      34       eight characters of upper-case hexadecimal.  */
      35  
      36    bp = _itoa_word (id, &buf[sizeof buf], 16, 1);
      37    while (bp > buf)
      38      *--bp = '0';
      39  
      40    n = _hurd_set_host_config ("/etc/hostid", buf, sizeof buf);
      41    return n < 0 ? -1 : 0;
      42  }