1 /* Copyright (C) 2017-2021 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 <stdlib.h>
19 #include <string.h>
20 #include <errno.h>
21 #include <unistd.h>
22 #include <libc-lock.h>
23 #include "nisdomain.h"
24 
25 #define MAXDOMAINNAMELEN 1024
26 
27 static char domainname[MAXDOMAINNAMELEN];
28 
__libc_lock_define_initialized(static,domainname_lock)29 __libc_lock_define_initialized (static, domainname_lock)
30 
31 int
32 __nss_get_default_domain (char **outdomain)
33 {
34   int result = 0;
35   *outdomain = NULL;
36 
37   __libc_lock_lock (domainname_lock);
38 
39   if (domainname[0] != '\0')
40     {
41       if (getdomainname (domainname, MAXDOMAINNAMELEN) < 0)
42 	result = errno;
43       else if (strcmp (domainname, "(none)") == 0)
44 	{
45 	  /* If domainname is not set, some systems will return "(none)" */
46 	  domainname[0] = '\0';
47 	  result = ENOENT;
48 	}
49       else
50 	*outdomain = domainname;
51     }
52   else
53     *outdomain = domainname;
54 
55   __libc_lock_unlock (domainname_lock);
56 
57   return result;
58 }
59