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/* Copyright (C) 1996, 1997 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>
#if _LIBC
#include <libc-lock.h>
#else
#define __libc_lock_lock(lock) ((void) 0)
#define __libc_lock_unlock(lock) ((void) 0)
#define __libc_lock_define_initialized(CLASS,NAME)
#define weak_alias(name, aliasname) \
extern __typeof (name) aliasname __attribute__ ((weak, alias (#name)));
#endif
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <utmp.h>
#include "utmp-private.h"
/* The various backends we have. */
static int setutent_unknown (int reset);
static int getutent_r_unknown (struct utmp *buffer, struct utmp **result);
static struct utmp *pututline_unknown (const struct utmp *data);
static void endutent_unknown (void);
/* Initial Jump table. */
struct utfuncs __libc_utmp_unknown_functions =
{
setutent_unknown,
getutent_r_unknown,
NULL,
NULL,
pututline_unknown,
endutent_unknown,
NULL
};
/* Currently selected backend. */
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)
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 == &__libc_utmp_unknown_functions);
/* See whether utmpd is running. */
if ((*__libc_utmp_daemon_functions.setutent) (reset))
__libc_utmp_jump_table = &__libc_utmp_daemon_functions;
else
{
/* Use the normal file, but if the current file is _PATH_UTMP or
_PATH_WTMP and the corresponding extended file (with an extra
'x' added to the pathname) exists, we use the extended file,
because the original file is in a different format. */
if (strcmp (__libc_utmp_file_name, _PATH_UTMP) == 0
&& __access (_PATH_UTMP "x", F_OK) == 0)
__utmpname (_PATH_UTMP "x");
else if (strcmp (__libc_utmp_file_name, _PATH_WTMP) == 0
&& __access (_PATH_WTMP "x", F_OK) == 0)
__utmpname (_PATH_WTMP "x");
(*__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);
}
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)
static struct utmp *
pututline_unknown (const struct utmp *data)
{
/* It is not yet initialized. */
setutent_unknown (0);
return (*__libc_utmp_jump_table->pututline) (data);
}
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