1 /* Copyright (C) 1991-2022 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
22 /* Return the current machine's Internet number. */
23 long int
gethostid(void)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 }
35