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/* Copyright (C) 1996-2017 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;
}
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;
}
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)
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