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/* Copyright (C) 1996-2018 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 Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <libc-lock.h>
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#include <stdlib.h>
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#include <utmp.h>
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#include "utmp-private.h"
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/* Functions defined here. */
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static int setutent_unknown (void);
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static int getutent_r_unknown (struct utmp *buffer, struct utmp **result);
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static int getutid_r_unknown (const struct utmp *line, struct utmp *buffer,
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struct utmp **result);
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static int getutline_r_unknown (const struct utmp *id, struct utmp *buffer,
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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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const 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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getutid_r_unknown,
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getutline_r_unknown,
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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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const 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 attribute_hidden)
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static int
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setutent_unknown (void)
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{
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int result;
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result = (*__libc_utmp_file_functions.setutent) ();
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if (result)
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__libc_utmp_jump_table = &__libc_utmp_file_functions;
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return result;
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}
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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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/* The backend was not yet initialized. */
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if (setutent_unknown ())
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return (*__libc_utmp_jump_table->getutent_r) (buffer, result);
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/* Not available. */
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*result = NULL;
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return -1;
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}
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static int
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getutid_r_unknown (const struct utmp *id, struct utmp *buffer,
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struct utmp **result)
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{
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/* The backend was not yet initialized. */
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if (setutent_unknown ())
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return (*__libc_utmp_jump_table->getutid_r) (id, buffer, result);
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/* Not available. */
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*result = NULL;
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return -1;
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}
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static int
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getutline_r_unknown (const struct utmp *line, struct utmp *buffer,
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struct utmp **result)
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{
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/* The backend was not yet initialized. */
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if (setutent_unknown ())
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return (*__libc_utmp_jump_table->getutline_r) (line, buffer, result);
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/* Not available. */
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*result = NULL;
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return -1;
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}
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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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/* The backend was not yet initialized. */
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if (setutent_unknown ())
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return (*__libc_utmp_jump_table->pututline) (data);
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/* Not available. */
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return NULL;
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}
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static void
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endutent_unknown (void)
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{
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/* Nothing to do. */
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}
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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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(*__libc_utmp_jump_table->setutent) ();
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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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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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libc_hidden_def (__getutent_r)
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weak_alias (__getutent_r, getutent_r)
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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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libc_hidden_def (__pututline)
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weak_alias (__pututline, pututline)
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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_utmp_jump_table = &__libc_utmp_unknown_functions;
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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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