1 /* Copyright (C) 1992-2022 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 <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.  */
26 int
__gethostname(char * name,size_t len)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 
46 weak_alias (__gethostname, gethostname)
47