/* Copyright (C) 1997-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   Contributed by Mark Kettenis <kettenis@phys.uva.nl>, 1997.

   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 <libc-lock.h>

#include <stdlib.h>

#include <string.h>

#include <utmp.h>

#include "utmp-private.h"

/* This is the default name.  */

static const char default_file_name[] = _PATH_UTMP;

/* Current file name.  */

const char *__libc_utmp_file_name = (const char *) default_file_name;

/* We have to use the lock in getutent_r.c.  */

__libc_lock_define (extern, __libc_utmp_lock attribute_hidden)

int

__utmpname (const char *file)

{

  int result = -1;

  __libc_lock_lock (__libc_utmp_lock);

  /* Close the old file.  */

  (*__libc_utmp_jump_table->endutent) ();

  __libc_utmp_jump_table = &__libc_utmp_unknown_functions;

  if (strcmp (file, __libc_utmp_file_name) != 0)

    {

      if (strcmp (file, default_file_name) == 0)

	{

	  free ((char *) __libc_utmp_file_name);

	  __libc_utmp_file_name = default_file_name;

	}

      else

	{

	  char *file_name = __strdup (file);

	  if (file_name == NULL)

	    /* Out of memory.  */

	    goto done;

	  if (__libc_utmp_file_name != default_file_name)

	    free ((char *) __libc_utmp_file_name);

	  __libc_utmp_file_name = file_name;

	}

    }

  result = 0;

done:

  __libc_lock_unlock (__libc_utmp_lock);

  return result;

}

weak_alias (__utmpname, utmpname)