175 lines
4.4 KiB
C
175 lines
4.4 KiB
C
/* Copyright (C) 1996, 1997 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@cygnus.com>
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and Paul Janzen <pcj@primenet.com>, 1996.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <assert.h>
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#if _LIBC
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#include <libc-lock.h>
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#else
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#define __libc_lock_lock(lock) ((void) 0)
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#define __libc_lock_unlock(lock) ((void) 0)
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#define __libc_lock_define_initialized(CLASS,NAME)
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#define weak_alias(name, aliasname) \
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extern __typeof (name) aliasname __attribute__ ((weak, alias (#name)));
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#endif
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <utmp.h>
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#include "utmp-private.h"
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/* The various backends we have. */
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static int setutent_unknown (int reset);
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static int getutent_r_unknown (struct utmp *buffer, struct utmp **result);
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static struct utmp *pututline_unknown (const struct utmp *data);
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static void endutent_unknown (void);
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/* Initial Jump table. */
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struct utfuncs __libc_utmp_unknown_functions =
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{
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setutent_unknown,
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getutent_r_unknown,
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NULL,
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NULL,
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pututline_unknown,
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endutent_unknown,
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NULL
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};
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/* Currently selected backend. */
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struct utfuncs *__libc_utmp_jump_table = &__libc_utmp_unknown_functions;
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/* We need to protect the opening of the file. */
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__libc_lock_define_initialized (, __libc_utmp_lock)
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void
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__setutent (void)
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{
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__libc_lock_lock (__libc_utmp_lock);
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(void) (*__libc_utmp_jump_table->setutent) (1);
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__libc_lock_unlock (__libc_utmp_lock);
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}
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weak_alias (__setutent, setutent)
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static int
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setutent_unknown (int reset)
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{
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/* We have to test whether it is still not decided which backend to use. */
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assert (__libc_utmp_jump_table == &__libc_utmp_unknown_functions);
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/* See whether utmpd is running. */
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if ((*__libc_utmp_daemon_functions.setutent) (reset))
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__libc_utmp_jump_table = &__libc_utmp_daemon_functions;
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else
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{
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/* Use the normal file, but if the current file is _PATH_UTMP or
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_PATH_WTMP and the corresponding extended file (with an extra
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'x' added to the pathname) exists, we use the extended file,
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because the original file is in a different format. */
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if (strcmp (__libc_utmp_file_name, _PATH_UTMP) == 0
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&& __access (_PATH_UTMP "x", F_OK) == 0)
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__utmpname (_PATH_UTMP "x");
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else if (strcmp (__libc_utmp_file_name, _PATH_WTMP) == 0
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&& __access (_PATH_WTMP "x", F_OK) == 0)
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__utmpname (_PATH_WTMP "x");
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(*__libc_utmp_file_functions.setutent) (reset);
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__libc_utmp_jump_table = &__libc_utmp_file_functions;
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}
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return 0;
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}
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void
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__endutent (void)
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{
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__libc_lock_lock (__libc_utmp_lock);
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(*__libc_utmp_jump_table->endutent) ();
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__libc_lock_unlock (__libc_utmp_lock);
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}
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weak_alias (__endutent, endutent)
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static void
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endutent_unknown (void)
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{
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/* Huh, how do we came here? Nothing to do. */
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}
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int
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__getutent_r (struct utmp *buffer, struct utmp **result)
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{
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int retval;
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__libc_lock_lock (__libc_utmp_lock);
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retval = (*__libc_utmp_jump_table->getutent_r) (buffer, result);
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__libc_lock_unlock (__libc_utmp_lock);
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return retval;
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}
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weak_alias (__getutent_r, getutent_r)
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static int
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getutent_r_unknown (struct utmp *buffer, struct utmp **result)
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{
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/* It is not yet initialized. */
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setutent_unknown (0);
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return (*__libc_utmp_jump_table->getutent_r) (buffer, result);
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}
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struct utmp *
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__pututline (const struct utmp *data)
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{
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struct utmp *buffer;
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__libc_lock_lock (__libc_utmp_lock);
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buffer = (*__libc_utmp_jump_table->pututline) (data);
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__libc_lock_unlock (__libc_utmp_lock);
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return buffer;
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}
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weak_alias (__pututline, pututline)
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static struct utmp *
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pututline_unknown (const struct utmp *data)
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{
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/* It is not yet initialized. */
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setutent_unknown (0);
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return (*__libc_utmp_jump_table->pututline) (data);
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}
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