1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
|
/* 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 <sys/stat.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);
/* 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);
}
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);
}
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)
|
