1 /* Copyright (C) 1993-2022 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
sethostid(long int id)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 }
43