/* Copyright (C) 2017-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; if not, see

   <http://www.gnu.org/licenses/>.  */

#include <stdlib.h>

#include <string.h>

#include <errno.h>

#include <unistd.h>

#include <libc-lock.h>

#include "nisdomain.h"

#define MAXDOMAINNAMELEN 1024

static char domainname[MAXDOMAINNAMELEN];

__libc_lock_define_initialized (static, domainname_lock)

int

__nss_get_default_domain (char **outdomain)

{

  int result = 0;

  *outdomain = NULL;

  __libc_lock_lock (domainname_lock);

  if (domainname[0] != '\0')

    {

      if (getdomainname (domainname, MAXDOMAINNAMELEN) < 0)

	result = errno;

      else if (strcmp (domainname, "(none)") == 0)

	{

	  /* If domainname is not set, some systems will return "(none)" */

	  domainname[0] = '\0';

	  result = ENOENT;

	}

      else

	*outdomain = domainname;

    }

  else

    *outdomain = domainname;

  __libc_lock_unlock (domainname_lock);

  return result;

}