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/* Copyright (C) 1996-2018 Free Software Foundation, Inc.
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6c4009 |
This file is part of the GNU C Library.
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6c4009 |
Contributed by Ulrich Drepper <drepper@cygnus.com>
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6c4009 |
and Paul Janzen <pcj@primenet.com>, 1996.
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6c4009 |
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6c4009 |
The GNU C Library is free software; you can redistribute it and/or
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6c4009 |
modify it under the terms of the GNU Lesser General Public
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6c4009 |
License as published by the Free Software Foundation; either
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6c4009 |
version 2.1 of the License, or (at your option) any later version.
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6c4009 |
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6c4009 |
The GNU C Library is distributed in the hope that it will be useful,
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6c4009 |
but WITHOUT ANY WARRANTY; without even the implied warranty of
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6c4009 |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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6c4009 |
Lesser General Public License for more details.
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6c4009 |
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6c4009 |
You should have received a copy of the GNU Lesser General Public
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6c4009 |
License along with the GNU C Library; if not, see
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6c4009 |
<http://www.gnu.org/licenses/>. */
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6c4009 |
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6c4009 |
#include <assert.h>
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6c4009 |
#include <errno.h>
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6c4009 |
#include <fcntl.h>
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6c4009 |
#include <signal.h>
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6c4009 |
#include <stdbool.h>
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6c4009 |
#include <stdio.h>
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6c4009 |
#include <string.h>
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6c4009 |
#include <unistd.h>
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6c4009 |
#include <utmp.h>
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6c4009 |
#include <not-cancel.h>
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6c4009 |
#include <kernel-features.h>
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6c4009 |
#include <sigsetops.h>
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6c4009 |
#include <not-cancel.h>
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6c4009 |
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6c4009 |
#include "utmp-private.h"
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6c4009 |
#include "utmp-equal.h"
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6c4009 |
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6c4009 |
/* Descriptor for the file and position. */
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static int file_fd = -1;
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6c4009 |
static bool file_writable;
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6c4009 |
static off64_t file_offset;
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6c4009 |
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6c4009 |
/* Cache for the last read entry. */
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6c4009 |
static struct utmp last_entry;
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6c4009 |
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6c4009 |
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6c4009 |
/* Locking timeout. */
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6c4009 |
#ifndef TIMEOUT
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6c4009 |
# define TIMEOUT 10
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6c4009 |
#endif
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6c4009 |
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6c4009 |
/* Do-nothing handler for locking timeout. */
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6c4009 |
static void timeout_handler (int signum) {};
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5f5648 |
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5f5648 |
/* try_file_lock (LOCKING, FD, TYPE) returns true if the locking
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5f5648 |
operation failed and recovery needs to be performed.
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5f5648 |
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5f5648 |
file_unlock (FD) removes the lock (which must have been
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d20430 |
successfully acquired). */
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5f5648 |
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5f5648 |
static bool
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d20430 |
try_file_lock (int fd, int type)
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5f5648 |
{
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5f5648 |
/* Cancel any existing alarm. */
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d20430 |
int old_timeout = alarm (0);
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5f5648 |
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5f5648 |
/* Establish signal handler. */
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d20430 |
struct sigaction old_action;
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5f5648 |
struct sigaction action;
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5f5648 |
action.sa_handler = timeout_handler;
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5f5648 |
__sigemptyset (&action.sa_mask);
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5f5648 |
action.sa_flags = 0;
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d20430 |
__sigaction (SIGALRM, &action, &old_action);
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5f5648 |
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5f5648 |
alarm (TIMEOUT);
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5f5648 |
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Packit Service |
5f5648 |
/* Try to get the lock. */
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Packit Service |
fbc33e |
struct flock64 fl =
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5f5648 |
{
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5f5648 |
.l_type = type,
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5f5648 |
fl.l_whence = SEEK_SET,
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5f5648 |
};
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d20430 |
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d20430 |
bool status = __fcntl64_nocancel (fd, F_SETLKW, &fl) < 0;
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d20430 |
int saved_errno = errno;
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d20430 |
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d20430 |
/* Reset the signal handler and alarm. We must reset the alarm
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d20430 |
before resetting the handler so our alarm does not generate a
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d20430 |
spurious SIGALRM seen by the user. However, we cannot just set
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d20430 |
the user's old alarm before restoring the handler, because then
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d20430 |
it's possible our handler could catch the user alarm's SIGARLM and
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d20430 |
then the user would never see the signal he expected. */
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d20430 |
alarm (0);
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d20430 |
__sigaction (SIGALRM, &old_action, NULL);
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d20430 |
if (old_timeout != 0)
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d20430 |
alarm (old_timeout);
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d20430 |
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Packit Service |
d20430 |
__set_errno (saved_errno);
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d20430 |
return status;
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5f5648 |
}
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5f5648 |
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5f5648 |
static void
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5f5648 |
file_unlock (int fd)
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Packit Service |
5f5648 |
{
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fbc33e |
struct flock64 fl =
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Packit Service |
5f5648 |
{
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5f5648 |
.l_type = F_UNLCK,
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Packit Service |
5f5648 |
};
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|
Packit Service |
5f5648 |
__fcntl64_nocancel (fd, F_SETLKW, &fl);
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|
Packit Service |
5f5648 |
}
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5f5648 |
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6c4009 |
#ifndef TRANSFORM_UTMP_FILE_NAME
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6c4009 |
# define TRANSFORM_UTMP_FILE_NAME(file_name) (file_name)
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6c4009 |
#endif
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6c4009 |
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2f694a |
int
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2f694a |
__libc_setutent (void)
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Packit |
6c4009 |
{
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6c4009 |
if (file_fd < 0)
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6c4009 |
{
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6c4009 |
const char *file_name;
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6c4009 |
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6c4009 |
file_name = TRANSFORM_UTMP_FILE_NAME (__libc_utmp_file_name);
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6c4009 |
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6c4009 |
file_writable = false;
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6c4009 |
file_fd = __open_nocancel
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6c4009 |
(file_name, O_RDONLY | O_LARGEFILE | O_CLOEXEC);
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|
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6c4009 |
if (file_fd == -1)
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6c4009 |
return 0;
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6c4009 |
}
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6c4009 |
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6c4009 |
__lseek64 (file_fd, 0, SEEK_SET);
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6c4009 |
file_offset = 0;
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6c4009 |
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Packit Service |
6de65a |
/* Make sure the entry won't match. */
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Packit Service |
6de65a |
last_entry.ut_type = -1;
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Packit Service |
6de65a |
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Packit |
6c4009 |
return 1;
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6c4009 |
}
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6c4009 |
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2f694a |
/* Preform initialization if necessary. */
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2f694a |
static bool
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Packit Service |
2f694a |
maybe_setutent (void)
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Packit Service |
2f694a |
{
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Packit Service |
2f694a |
return file_fd >= 0 || __libc_setutent ();
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Packit Service |
2f694a |
}
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6c4009 |
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2f694a |
int
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2f694a |
__libc_getutent_r (struct utmp *buffer, struct utmp **result)
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Packit Service |
82ff93 |
{
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Packit Service |
6de65a |
ssize_t nbytes;
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Packit Service |
82ff93 |
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Packit Service |
2f694a |
if (!maybe_setutent () || file_offset == -1l)
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Packit |
6c4009 |
{
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Packit |
6c4009 |
/* Not available. */
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6c4009 |
*result = NULL;
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Packit |
6c4009 |
return -1;
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Packit |
6c4009 |
}
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6c4009 |
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Packit Service |
d20430 |
if (try_file_lock (file_fd, F_RDLCK))
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Packit Service |
5f5648 |
nbytes = 0;
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Packit Service |
5f5648 |
else
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|
Packit Service |
6de65a |
{
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|
Packit Service |
5f5648 |
/* Read the next entry. */
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|
Packit Service |
5f5648 |
nbytes = __read_nocancel (file_fd, &last_entry, sizeof (struct utmp));
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|
Packit Service |
5f5648 |
file_unlock (file_fd);
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|
Packit Service |
6de65a |
}
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|
Packit Service |
6de65a |
|
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Packit Service |
6de65a |
if (nbytes != sizeof (struct utmp))
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|
Packit |
6c4009 |
{
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Packit Service |
6de65a |
if (nbytes != 0)
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Packit Service |
6de65a |
file_offset = -1l;
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Packit |
6c4009 |
*result = NULL;
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Packit |
6c4009 |
return -1;
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Packit |
6c4009 |
}
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6c4009 |
|
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Packit Service |
6de65a |
/* Update position pointer. */
|
|
Packit Service |
6de65a |
file_offset += sizeof (struct utmp);
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|
Packit Service |
6de65a |
|
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Packit |
6c4009 |
memcpy (buffer, &last_entry, sizeof (struct utmp));
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|
Packit |
6c4009 |
*result = buffer;
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|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
return 0;
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|
Packit |
6c4009 |
}
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Packit |
6c4009 |
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Packit |
6c4009 |
|
|
Packit |
6c4009 |
static int
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|
Packit Service |
6de65a |
internal_getut_r (const struct utmp *id, struct utmp *buffer,
|
|
Packit Service |
6de65a |
bool *lock_failed)
|
|
Packit |
6c4009 |
{
|
|
Packit Service |
6de65a |
int result = -1;
|
|
Packit Service |
6de65a |
|
|
Packit Service |
d20430 |
if (try_file_lock (file_fd, F_RDLCK))
|
|
Packit Service |
6de65a |
{
|
|
Packit Service |
6de65a |
*lock_failed = true;
|
|
Packit Service |
5f5648 |
return -1;
|
|
Packit Service |
6de65a |
}
|
|
Packit Service |
6de65a |
|
|
Packit Service |
6de65a |
if (id->ut_type == RUN_LVL || id->ut_type == BOOT_TIME
|
|
Packit Service |
6de65a |
|| id->ut_type == OLD_TIME || id->ut_type == NEW_TIME)
|
|
Packit |
6c4009 |
{
|
|
Packit Service |
6de65a |
/* Search for next entry with type RUN_LVL, BOOT_TIME,
|
|
Packit Service |
6de65a |
OLD_TIME, or NEW_TIME. */
|
|
Packit Service |
6de65a |
|
|
Packit Service |
6de65a |
while (1)
|
|
Packit |
6c4009 |
{
|
|
Packit Service |
6de65a |
/* Read the next entry. */
|
|
Packit Service |
6de65a |
if (__read_nocancel (file_fd, buffer, sizeof (struct utmp))
|
|
Packit Service |
6de65a |
!= sizeof (struct utmp))
|
|
Packit Service |
6de65a |
{
|
|
Packit Service |
6de65a |
__set_errno (ESRCH);
|
|
Packit Service |
6de65a |
file_offset = -1l;
|
|
Packit Service |
6de65a |
goto unlock_return;
|
|
Packit Service |
6de65a |
}
|
|
Packit Service |
6de65a |
file_offset += sizeof (struct utmp);
|
|
Packit Service |
6de65a |
|
|
Packit Service |
6de65a |
if (id->ut_type == buffer->ut_type)
|
|
Packit Service |
6de65a |
break;
|
|
Packit |
6c4009 |
}
|
|
Packit Service |
6de65a |
}
|
|
Packit Service |
6de65a |
else
|
|
Packit Service |
6de65a |
{
|
|
Packit Service |
6de65a |
/* Search for the next entry with the specified ID and with type
|
|
Packit Service |
6de65a |
INIT_PROCESS, LOGIN_PROCESS, USER_PROCESS, or DEAD_PROCESS. */
|
|
Packit Service |
93dc7a |
|
|
Packit Service |
6de65a |
while (1)
|
|
Packit Service |
6de65a |
{
|
|
Packit Service |
6de65a |
/* Read the next entry. */
|
|
Packit Service |
6de65a |
if (__read_nocancel (file_fd, buffer, sizeof (struct utmp))
|
|
Packit Service |
6de65a |
!= sizeof (struct utmp))
|
|
Packit Service |
6de65a |
{
|
|
Packit Service |
6de65a |
__set_errno (ESRCH);
|
|
Packit Service |
6de65a |
file_offset = -1l;
|
|
Packit Service |
6de65a |
goto unlock_return;
|
|
Packit Service |
6de65a |
}
|
|
Packit Service |
6de65a |
file_offset += sizeof (struct utmp);
|
|
Packit Service |
6de65a |
|
|
Packit Service |
6de65a |
if (__utmp_equal (buffer, id))
|
|
Packit Service |
6de65a |
break;
|
|
Packit Service |
6de65a |
}
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit Service |
6de65a |
result = 0;
|
|
Packit |
6c4009 |
|
|
Packit Service |
6de65a |
unlock_return:
|
|
Packit Service |
5f5648 |
file_unlock (file_fd);
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
return result;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit Service |
6de65a |
|
|
Packit |
6c4009 |
/* For implementing this function we don't use the getutent_r function
|
|
Packit |
6c4009 |
because we can avoid the reposition on every new entry this way. */
|
|
Packit Service |
2f694a |
int
|
|
Packit Service |
2f694a |
__libc_getutid_r (const struct utmp *id, struct utmp *buffer,
|
|
Packit Service |
2f694a |
struct utmp **result)
|
|
Packit |
6c4009 |
{
|
|
Packit Service |
2f694a |
if (!maybe_setutent () || file_offset == -1l)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
*result = NULL;
|
|
Packit |
6c4009 |
return -1;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* We don't have to distinguish whether we can lock the file or
|
|
Packit |
6c4009 |
whether there is no entry. */
|
|
Packit |
6c4009 |
bool lock_failed = false;
|
|
Packit Service |
6de65a |
if (internal_getut_r (id, &last_entry, &lock_failed) < 0)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
*result = NULL;
|
|
Packit |
6c4009 |
return -1;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
memcpy (buffer, &last_entry, sizeof (struct utmp));
|
|
Packit |
6c4009 |
*result = buffer;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
return 0;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit Service |
6de65a |
|
|
Packit |
6c4009 |
/* For implementing this function we don't use the getutent_r function
|
|
Packit |
6c4009 |
because we can avoid the reposition on every new entry this way. */
|
|
Packit Service |
2f694a |
int
|
|
Packit Service |
2f694a |
__libc_getutline_r (const struct utmp *line, struct utmp *buffer,
|
|
Packit Service |
2f694a |
struct utmp **result)
|
|
Packit |
6c4009 |
{
|
|
Packit Service |
2f694a |
if (!maybe_setutent () || file_offset == -1l)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
*result = NULL;
|
|
Packit |
6c4009 |
return -1;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit Service |
d20430 |
if (try_file_lock (file_fd, F_RDLCK))
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
*result = NULL;
|
|
Packit Service |
5f5648 |
return -1;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
while (1)
|
|
Packit |
6c4009 |
{
|
|
Packit Service |
6de65a |
/* Read the next entry. */
|
|
Packit Service |
6de65a |
if (__read_nocancel (file_fd, &last_entry, sizeof (struct utmp))
|
|
Packit Service |
6de65a |
!= sizeof (struct utmp))
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
__set_errno (ESRCH);
|
|
Packit Service |
6de65a |
file_offset = -1l;
|
|
Packit |
6c4009 |
*result = NULL;
|
|
Packit Service |
6de65a |
goto unlock_return;
|
|
Packit |
6c4009 |
}
|
|
Packit Service |
6de65a |
file_offset += sizeof (struct utmp);
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* Stop if we found a user or login entry. */
|
|
Packit Service |
c5ceb8 |
if ((last_entry.ut_type == USER_PROCESS
|
|
Packit |
6c4009 |
|| last_entry.ut_type == LOGIN_PROCESS)
|
|
Packit Service |
c5ceb8 |
&& (strncmp (line->ut_line, last_entry.ut_line, sizeof line->ut_line)
|
|
Packit Service |
c5ceb8 |
== 0))
|
|
Packit |
6c4009 |
break;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
memcpy (buffer, &last_entry, sizeof (struct utmp));
|
|
Packit |
6c4009 |
*result = buffer;
|
|
Packit |
6c4009 |
|
|
Packit Service |
6de65a |
unlock_return:
|
|
Packit Service |
5f5648 |
file_unlock (file_fd);
|
|
Packit Service |
6de65a |
|
|
Packit Service |
6de65a |
return ((*result == NULL) ? -1 : 0);
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
|
|
Packit Service |
2f694a |
struct utmp *
|
|
Packit Service |
2f694a |
__libc_pututline (const struct utmp *data)
|
|
Packit |
6c4009 |
{
|
|
Packit Service |
2f694a |
if (!maybe_setutent ())
|
|
Packit Service |
2f694a |
return NULL;
|
|
Packit Service |
2f694a |
|
|
Packit Service |
6de65a |
struct utmp buffer;
|
|
Packit |
6c4009 |
struct utmp *pbuf;
|
|
Packit Service |
6de65a |
int found;
|
|
Packit Service |
6de65a |
|
|
Packit |
6c4009 |
if (! file_writable)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
/* We must make the file descriptor writable before going on. */
|
|
Packit |
6c4009 |
const char *file_name = TRANSFORM_UTMP_FILE_NAME (__libc_utmp_file_name);
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
int new_fd = __open_nocancel
|
|
Packit |
6c4009 |
(file_name, O_RDWR | O_LARGEFILE | O_CLOEXEC);
|
|
Packit |
6c4009 |
if (new_fd == -1)
|
|
Packit |
6c4009 |
return NULL;
|
|
Packit |
6c4009 |
|
|
Packit Service |
6de65a |
if (__lseek64 (new_fd, __lseek64 (file_fd, 0, SEEK_CUR), SEEK_SET) == -1
|
|
Packit Service |
6de65a |
|| __dup2 (new_fd, file_fd) < 0)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
__close_nocancel_nostatus (new_fd);
|
|
Packit |
6c4009 |
return NULL;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
__close_nocancel_nostatus (new_fd);
|
|
Packit |
6c4009 |
file_writable = true;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* Find the correct place to insert the data. */
|
|
Packit Service |
6de65a |
if (file_offset > 0
|
|
Packit Service |
c5ceb8 |
&& ((last_entry.ut_type == data->ut_type
|
|
Packit Service |
6de65a |
&& (last_entry.ut_type == RUN_LVL
|
|
Packit Service |
6de65a |
|| last_entry.ut_type == BOOT_TIME
|
|
Packit Service |
6de65a |
|| last_entry.ut_type == OLD_TIME
|
|
Packit Service |
6de65a |
|| last_entry.ut_type == NEW_TIME))
|
|
Packit Service |
c5ceb8 |
|| __utmp_equal (&last_entry, data)))
|
|
Packit Service |
6de65a |
found = 1;
|
|
Packit Service |
6de65a |
else
|
|
Packit |
6c4009 |
{
|
|
Packit Service |
6de65a |
bool lock_failed = false;
|
|
Packit Service |
6de65a |
found = internal_getut_r (data, &buffer, &lock_failed);
|
|
Packit Service |
6de65a |
|
|
Packit Service |
6de65a |
if (__builtin_expect (lock_failed, false))
|
|
Packit |
6c4009 |
{
|
|
Packit Service |
6de65a |
__set_errno (EAGAIN);
|
|
Packit |
6c4009 |
return NULL;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit Service |
d20430 |
if (try_file_lock (file_fd, F_WRLCK))
|
|
Packit Service |
d20430 |
return NULL;
|
|
Packit |
6c4009 |
|
|
Packit Service |
6de65a |
if (found < 0)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
/* We append the next entry. */
|
|
Packit Service |
6de65a |
file_offset = __lseek64 (file_fd, 0, SEEK_END);
|
|
Packit Service |
6de65a |
if (file_offset % sizeof (struct utmp) != 0)
|
|
Packit Service |
6de65a |
{
|
|
Packit Service |
6de65a |
file_offset -= file_offset % sizeof (struct utmp);
|
|
Packit Service |
6de65a |
__ftruncate64 (file_fd, file_offset);
|
|
Packit Service |
6de65a |
|
|
Packit Service |
6de65a |
if (__lseek64 (file_fd, 0, SEEK_END) < 0)
|
|
Packit Service |
6de65a |
{
|
|
Packit Service |
6de65a |
pbuf = NULL;
|
|
Packit Service |
6de65a |
goto unlock_return;
|
|
Packit Service |
6de65a |
}
|
|
Packit Service |
6de65a |
}
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
else
|
|
Packit |
6c4009 |
{
|
|
Packit Service |
6de65a |
/* We replace the just read entry. */
|
|
Packit Service |
6de65a |
file_offset -= sizeof (struct utmp);
|
|
Packit Service |
6de65a |
__lseek64 (file_fd, file_offset, SEEK_SET);
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit Service |
6de65a |
/* Write the new data. */
|
|
Packit Service |
6de65a |
if (__write_nocancel (file_fd, data, sizeof (struct utmp))
|
|
Packit Service |
6de65a |
!= sizeof (struct utmp))
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
/* If we appended a new record this is only partially written.
|
|
Packit |
6c4009 |
Remove it. */
|
|
Packit Service |
6de65a |
if (found < 0)
|
|
Packit Service |
6de65a |
(void) __ftruncate64 (file_fd, file_offset);
|
|
Packit Service |
6de65a |
pbuf = NULL;
|
|
Packit Service |
6de65a |
}
|
|
Packit Service |
6de65a |
else
|
|
Packit Service |
6de65a |
{
|
|
Packit Service |
6de65a |
file_offset += sizeof (struct utmp);
|
|
Packit Service |
6de65a |
pbuf = (struct utmp *) data;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit Service |
6de65a |
unlock_return:
|
|
Packit Service |
5f5648 |
file_unlock (file_fd);
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
return pbuf;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
|
|
Packit Service |
2f694a |
void
|
|
Packit Service |
2f694a |
__libc_endutent (void)
|
|
Packit |
6c4009 |
{
|
|
Packit Service |
2f694a |
if (file_fd >= 0)
|
|
Packit Service |
2f694a |
{
|
|
Packit Service |
2f694a |
__close_nocancel_nostatus (file_fd);
|
|
Packit Service |
2f694a |
file_fd = -1;
|
|
Packit Service |
2f694a |
}
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
|
|
Packit Service |
2f694a |
int
|
|
Packit Service |
2f694a |
__libc_updwtmp (const char *file, const struct utmp *utmp)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
int result = -1;
|
|
Packit |
6c4009 |
off64_t offset;
|
|
Packit |
6c4009 |
int fd;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* Open WTMP file. */
|
|
Packit |
6c4009 |
fd = __open_nocancel (file, O_WRONLY | O_LARGEFILE);
|
|
Packit |
6c4009 |
if (fd < 0)
|
|
Packit |
6c4009 |
return -1;
|
|
Packit |
6c4009 |
|
|
Packit Service |
d20430 |
if (try_file_lock (fd, F_WRLCK))
|
|
Packit Service |
5f5648 |
{
|
|
Packit Service |
5f5648 |
__close_nocancel_nostatus (fd);
|
|
Packit Service |
5f5648 |
return -1;
|
|
Packit Service |
5f5648 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* Remember original size of log file. */
|
|
Packit |
6c4009 |
offset = __lseek64 (fd, 0, SEEK_END);
|
|
Packit |
6c4009 |
if (offset % sizeof (struct utmp) != 0)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
offset -= offset % sizeof (struct utmp);
|
|
Packit |
6c4009 |
__ftruncate64 (fd, offset);
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
if (__lseek64 (fd, 0, SEEK_END) < 0)
|
|
Packit |
6c4009 |
goto unlock_return;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* Write the entry. If we can't write all the bytes, reset the file
|
|
Packit |
6c4009 |
size back to the original size. That way, no partial entries
|
|
Packit |
6c4009 |
will remain. */
|
|
Packit |
6c4009 |
if (__write_nocancel (fd, utmp, sizeof (struct utmp))
|
|
Packit |
6c4009 |
!= sizeof (struct utmp))
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
__ftruncate64 (fd, offset);
|
|
Packit |
6c4009 |
goto unlock_return;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
result = 0;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
unlock_return:
|
|
Packit Service |
745861 |
file_unlock (fd);
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* Close WTMP file. */
|
|
Packit |
6c4009 |
__close_nocancel_nostatus (fd);
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
return result;
|
|
Packit |
6c4009 |
}
|