1/* Copyright (C) 1992-2020 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 <errno.h>
19#include <string.h>
20#include <unistd.h>
21#include <sys/utsname.h>
22
23/* Put the name of the current host in no more than LEN bytes of NAME.
24 The result is null-terminated if LEN is large enough for the full
25 name and the terminator. */
26int
27__gethostname (char *name, size_t len)
28{
29 struct utsname buf;
30 size_t node_len;
31
32 if (__uname (&buf))
33 return -1;
34
35 node_len = strlen (buf.nodename) + 1;
36 memcpy (name, buf.nodename, len < node_len ? len : node_len);
37
38 if (node_len > len)
39 {
40 __set_errno (ENAMETOOLONG);
41 return -1;
42 }
43 return 0;
44}
45
46weak_alias (__gethostname, gethostname)
47