1/* Internal definitions and declarations for UTMP functions.
2 Copyright (C) 1996-2019 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Ulrich Drepper <drepper@cygnus.com>
5 and Paul Janzen <pcj@primenet.com>, 1996.
6
7 The GNU C Library is free software; you can redistribute it and/or
8 modify it under the terms of the GNU Lesser General Public
9 License as published by the Free Software Foundation; either
10 version 2.1 of the License, or (at your option) any later version.
11
12 The GNU C Library is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 Lesser General Public License for more details.
16
17 You should have received a copy of the GNU Lesser General Public
18 License along with the GNU C Library; if not, see
19 <http://www.gnu.org/licenses/>. */
20
21#ifndef _UTMP_PRIVATE_H
22#define _UTMP_PRIVATE_H 1
23
24#include <utmp.h>
25#include <libc-lock.h>
26
27/* The structure describing the functions in a backend. */
28struct utfuncs
29{
30 int (*setutent) (void);
31 int (*getutent_r) (struct utmp *, struct utmp **);
32 int (*getutid_r) (const struct utmp *, struct utmp *, struct utmp **);
33 int (*getutline_r) (const struct utmp *, struct utmp *, struct utmp **);
34 struct utmp *(*pututline) (const struct utmp *);
35 void (*endutent) (void);
36 int (*updwtmp) (const char *, const struct utmp *);
37};
38
39/* The tables from the services. */
40extern const struct utfuncs __libc_utmp_file_functions attribute_hidden;
41extern const struct utfuncs __libc_utmp_unknown_functions attribute_hidden;
42
43/* Currently selected backend. */
44extern const struct utfuncs *__libc_utmp_jump_table attribute_hidden;
45
46/* Current file name. */
47extern const char *__libc_utmp_file_name attribute_hidden;
48
49/* Locks access to the global data. */
50__libc_lock_define (extern, __libc_utmp_lock attribute_hidden)
51
52
53#endif /* utmp-private.h */
54