1/* Copyright (C) 1997-2019 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Mark Kettenis <kettenis@phys.uva.nl>, 1997.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <http://www.gnu.org/licenses/>. */
18
19#include <libc-lock.h>
20#include <stdlib.h>
21#include <string.h>
22#include <utmp.h>
23
24#include "utmp-private.h"
25
26
27/* This is the default name. */
28static const char default_file_name[] = _PATH_UTMP;
29
30/* Current file name. */
31const char *__libc_utmp_file_name = (const char *) default_file_name;
32
33/* We have to use the lock in getutent_r.c. */
34__libc_lock_define (extern, __libc_utmp_lock attribute_hidden)
35
36
37int
38__utmpname (const char *file)
39{
40 int result = -1;
41
42 __libc_lock_lock (__libc_utmp_lock);
43
44 /* Close the old file. */
45 (*__libc_utmp_jump_table->endutent) ();
46 __libc_utmp_jump_table = &__libc_utmp_unknown_functions;
47
48 if (strcmp (file, __libc_utmp_file_name) != 0)
49 {
50 if (strcmp (file, default_file_name) == 0)
51 {
52 free ((char *) __libc_utmp_file_name);
53
54 __libc_utmp_file_name = default_file_name;
55 }
56 else
57 {
58 char *file_name = __strdup (file);
59 if (file_name == NULL)
60 /* Out of memory. */
61 goto done;
62
63 if (__libc_utmp_file_name != default_file_name)
64 free ((char *) __libc_utmp_file_name);
65
66 __libc_utmp_file_name = file_name;
67 }
68 }
69
70 result = 0;
71
72done:
73 __libc_lock_unlock (__libc_utmp_lock);
74 return result;
75}
76weak_alias (__utmpname, utmpname)
77