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/* Copyright (C) 1996 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 Library General Public License as
published by the Free Software Foundation; either version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <assert.h>
#include <db.h>
#include <fcntl.h>
#include <libc-lock.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <utmp.h>
#include <gnu/lib-names.h>
#include <sys/stat.h>
#include "utmp-private.h"
#include "../elf/link.h"
/* The various backends we have. */
static int __setutent_unknown (int reset);
static int __getutent_r_unknown (struct utmp *buffer, struct utmp **result);
static void __pututline_unknown (const struct utmp *data);
static void __endutent_unknown (void);
/* We have three jump tables: unknown, db, or file. */
static struct utfuncs unknown_functions =
{
__setutent_unknown,
__getutent_r_unknown,
NULL,
NULL,
__pututline_unknown,
__endutent_unknown,
NULL
};
/* Currently selected backend. */
struct utfuncs *__libc_utmp_jump_table = &unknown_functions;
/* The tables from the services. */
extern struct utfuncs __libc_utmp_db_functions;
extern struct utfuncs __libc_utmp_file_functions;
/* We need to protect the opening of the file. */
__libc_lock_define_initialized (, __libc_utmp_lock)
void
__setutent (void)
{
__libc_lock_lock (__libc_utmp_lock);
(void) (*__libc_utmp_jump_table->setutent) (1);
__libc_lock_unlock (__libc_utmp_lock);
}
weak_alias (__setutent, setutent)
static int
__setutent_unknown (int reset)
{
/* We have to test whether it is still not decided which backend to use. */
assert (__libc_utmp_jump_table == &unknown_functions);
/* See whether utmp db file exists. */
if ((*__libc_utmp_db_functions.setutent) (reset))
__libc_utmp_jump_table = &__libc_utmp_db_functions;
else
{
/* Either the db file does not exist or we have other
problems. So use the normal file. */
(*__libc_utmp_file_functions.setutent) (reset);
__libc_utmp_jump_table = &__libc_utmp_file_functions;
}
return 0;
}
void
__endutent (void)
{
__libc_lock_lock (__libc_utmp_lock);
(*__libc_utmp_jump_table->endutent) ();
__libc_lock_unlock (__libc_utmp_lock);
}
weak_alias (__endutent, endutent)
static void
__endutent_unknown (void)
{
/* Huh, how do we came here? Nothing to do. */
}
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)
static int
__getutent_r_unknown (struct utmp *buffer, struct utmp **result)
{
/* It is not yet initialized. */
__setutent_unknown (0);
return (*__libc_utmp_jump_table->getutent_r) (buffer, result);
}
void
__pututline (const struct utmp *data)
{
__libc_lock_lock (__libc_utmp_lock);
(*__libc_utmp_jump_table->pututline) (data);
__libc_lock_unlock (__libc_utmp_lock);
}
static void
__pututline_unknown (const struct utmp *data)
{
/* It is not yet initialized. */
__setutent_unknown (0);
(*__libc_utmp_jump_table->pututline) (data);
}
int
__utmpname (const char *file)
{
int result = -1;
__libc_lock_lock (__libc_utmp_lock);
/* Close the old file. */
(*__libc_utmp_jump_table->endutent) ();
/* Store new names. */
if ((*__libc_utmp_file_functions.utmpname) (file) == 0
&& !(*__libc_utmp_db_functions.utmpname) (file) == 0)
{
/* Try to find out whether we are supposed to work with a db
file or not. Do this by looking for the extension ".db". */
const char *ext = strrchr (file, '.');
if (ext != NULL && strcmp (ext, ".db") == 0)
__libc_utmp_jump_table = &__libc_utmp_db_functions;
else
__libc_utmp_jump_table = &unknown_functions;
result = 0;
}
__libc_lock_unlock (__libc_utmp_lock);
return result;
}
weak_alias (__utmpname, utmpname)
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