/* Copyright (C) 1996-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   Contributed by Ulrich Drepper <drepper@cygnus.com>

   and Paul Janzen <pcj@primenet.com>, 1996.

   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 <utmp.h>

#include "utmp-private.h"

/* Functions defined here.  */

static int setutent_unknown (void);

static int getutent_r_unknown (struct utmp *buffer, struct utmp **result);

static int getutid_r_unknown (const struct utmp *line, struct utmp *buffer,

			      struct utmp **result);

static int getutline_r_unknown (const struct utmp *id, struct utmp *buffer,

				struct utmp **result);

static struct utmp *pututline_unknown (const struct utmp *data);

static void endutent_unknown (void);

/* Initial Jump table.  */

const struct utfuncs __libc_utmp_unknown_functions =

{

  setutent_unknown,

  getutent_r_unknown,

  getutid_r_unknown,

  getutline_r_unknown,

  pututline_unknown,

  endutent_unknown,

  NULL

};

/* Currently selected backend.  */

const struct utfuncs *__libc_utmp_jump_table = &__libc_utmp_unknown_functions;

/* We need to protect the opening of the file.  */

__libc_lock_define_initialized (, __libc_utmp_lock attribute_hidden)

static int

setutent_unknown (void)

{

  int result;

  result = (*__libc_utmp_file_functions.setutent) ();

  if (result)

    __libc_utmp_jump_table = &__libc_utmp_file_functions;

  return result;

}

static int

getutent_r_unknown (struct utmp *buffer, struct utmp **result)

{

  /* The backend was not yet initialized.  */

  if (setutent_unknown ())

    return (*__libc_utmp_jump_table->getutent_r) (buffer, result);

  /* Not available.  */

  *result = NULL;

  return -1;

}

static int

getutid_r_unknown (const struct utmp *id, struct utmp *buffer,

		   struct utmp **result)

{

  /* The backend was not yet initialized.  */

  if (setutent_unknown ())

    return (*__libc_utmp_jump_table->getutid_r) (id, buffer, result);

  /* Not available.  */

  *result = NULL;

  return -1;

}

static int

getutline_r_unknown (const struct utmp *line, struct utmp *buffer,

		     struct utmp **result)

{

  /* The backend was not yet initialized.  */

  if (setutent_unknown ())

    return (*__libc_utmp_jump_table->getutline_r) (line, buffer, result);

  /* Not available.  */

  *result = NULL;

  return -1;

}

static struct utmp *

pututline_unknown (const struct utmp *data)

{

  /* The backend was not yet initialized.  */

  if (setutent_unknown ())

    return (*__libc_utmp_jump_table->pututline) (data);

  /* Not available.  */

  return NULL;

}

static void

endutent_unknown (void)

{

  /* Nothing to do.  */

}

void

__setutent (void)

{

  __libc_lock_lock (__libc_utmp_lock);

  (*__libc_utmp_jump_table->setutent) ();

  __libc_lock_unlock (__libc_utmp_lock);

}

weak_alias (__setutent, setutent)

int

__getutent_r (struct utmp *buffer, struct utmp **result)

{

  int retval;

  __libc_lock_lock (__libc_utmp_lock);

  retval = (*__libc_utmp_jump_table->getutent_r) (buffer, result);

  __libc_lock_unlock (__libc_utmp_lock);

  return retval;

}

libc_hidden_def (__getutent_r)

weak_alias (__getutent_r, getutent_r)

struct utmp *

__pututline (const struct utmp *data)

{

  struct utmp *buffer;

  __libc_lock_lock (__libc_utmp_lock);

  buffer = (*__libc_utmp_jump_table->pututline) (data);

  __libc_lock_unlock (__libc_utmp_lock);

  return buffer;

}

libc_hidden_def (__pututline)

weak_alias (__pututline, pututline)

void

__endutent (void)

{

  __libc_lock_lock (__libc_utmp_lock);

  (*__libc_utmp_jump_table->endutent) ();

  __libc_utmp_jump_table = &__libc_utmp_unknown_functions;

  __libc_lock_unlock (__libc_utmp_lock);

}

weak_alias (__endutent, endutent)