1 /* Copyright (C) 1996, 1997 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@cygnus.com>
4 and Paul Janzen <pcj@primenet.com>, 1996.
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Library General Public License as
8 published by the Free Software Foundation; either version 2 of the
9 License, or (at your option) any later version.
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Library General Public License for more details.
16 You should have received a copy of the GNU Library General Public
17 License along with the GNU C Library; see the file COPYING.LIB. If not,
18 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
22 #include <bits/libc-lock.h>
28 #include "utmp-private.h"
31 /* The various backends we have. */
32 static int getutent_r_unknown (struct utmp *buffer, struct utmp **result);
33 static struct utmp *pututline_unknown (const struct utmp *data);
34 static void setutent_unknown (void);
35 static void endutent_unknown (void);
37 /* Initial Jump table. */
38 struct utfuncs __libc_utmp_unknown_functions =
49 /* Currently selected backend. */
50 struct utfuncs *__libc_utmp_jump_table = &__libc_utmp_unknown_functions;
52 /* We need to protect the opening of the file. */
53 __libc_lock_define_initialized (, __libc_utmp_lock)
59 __libc_lock_lock (__libc_utmp_lock);
61 (*__libc_utmp_jump_table->setutent) ();
63 __libc_lock_unlock (__libc_utmp_lock);
65 weak_alias (__setutent, setutent)
66 weak_alias (__setutent, setutxent)
72 __libc_lock_lock (__libc_utmp_lock);
74 (*__libc_utmp_jump_table->endutent) ();
76 __libc_lock_unlock (__libc_utmp_lock);
78 weak_alias (__endutent, endutent)
79 weak_alias (__endutent, endutxent)
83 setutent_unknown (void)
85 /* See whether utmpd is running. */
86 if ((*__libc_utmp_daemon_functions.setutent) ())
87 __libc_utmp_jump_table = &__libc_utmp_daemon_functions;
90 (*__libc_utmp_file_functions.setutent) ();
91 __libc_utmp_jump_table = &__libc_utmp_file_functions;
97 endutent_unknown (void)
99 /* Huh, how do we came here? Nothing to do. */
104 __getutent_r (struct utmp *buffer, struct utmp **result)
108 __libc_lock_lock (__libc_utmp_lock);
110 retval = (*__libc_utmp_jump_table->getutent_r) (buffer, result);
112 __libc_lock_unlock (__libc_utmp_lock);
116 weak_alias (__getutent_r, getutent_r)
120 getutent_r_unknown (struct utmp *buffer, struct utmp **result)
122 /* It is not yet initialized. */
125 return (*__libc_utmp_jump_table->getutent_r) (buffer, result);
130 __pututline (const struct utmp *data)
134 __libc_lock_lock (__libc_utmp_lock);
136 buffer = (*__libc_utmp_jump_table->pututline) (data);
138 __libc_lock_unlock (__libc_utmp_lock);
142 weak_alias (__pututline, pututline)
143 weak_alias (__pututline, pututxline)
147 pututline_unknown (const struct utmp *data)
149 /* It is not yet initialized. */
152 return (*__libc_utmp_jump_table->pututline) (data);