1  /* Copyright (C) 2017-2023 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  
      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  }