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<?php
/**
* CodeIgniter
*
* An open source application development framework for PHP 5.2.4 or newer
*
* NOTICE OF LICENSE
*
* Licensed under the Open Software License version 3.0
*
* This source file is subject to the Open Software License (OSL 3.0) that is
* bundled with this package in the files license.txt / license.rst. It is
* also available through the world wide web at this URL:
* http://opensource.org/licenses/OSL-3.0
* If you did not receive a copy of the license and are unable to obtain it
* through the world wide web, please send an email to
* licensing@ellislab.com so we can send you a copy immediately.
*
* @package CodeIgniter
* @author EllisLab Dev Team
* @copyright Copyright (c) 2008 - 2014, EllisLab, Inc. (http://ellislab.com/)
* @license http://opensource.org/licenses/OSL-3.0 Open Software License (OSL 3.0)
* @link http://codeigniter.com
* @since Version 3.0
* @filesource
*/
defined('BASEPATH') OR exit('No direct script access allowed');
/**
* CodeIgniter Session Driver Class
*
* @package CodeIgniter
* @subpackage Libraries
* @category Sessions
* @author Andrey Andreev
* @link http://codeigniter.com/user_guide/libraries/sessions.html
*/
abstract class CI_Session_driver implements SessionHandlerInterface {
protected $_config;
/**
* Data fingerprint
*
* @var bool
*/
protected $_fingerprint;
/**
* Lock placeholder
*
* @var mixed
*/
protected $_lock = FALSE;
/**
* Read session ID
*
* Used to detect session_regenerate_id() calls because PHP only calls
* write() after regenerating the ID.
*
* @var string
*/
protected $_session_id;
// ------------------------------------------------------------------------
/**
* Class constructor
*
* @param array $params Configuration parameters
* @return void
*/
public function __construct(&$params)
{
$this->_config =& $params;
}
// ------------------------------------------------------------------------
protected function _cookie_destroy()
{
return setcookie(
$this->_config['cookie_name'],
NULL,
1,
$this->_config['cookie_path'],
$this->_config['cookie_domain'],
$this->_config['cookie_secure'],
TRUE
);
}
// ------------------------------------------------------------------------
/**
* Get lock
*
* A default locking mechanism via semaphores, if ext/sysvsem is available.
*
* Drivers will usually override this and only fallback to it if no other
* locking mechanism is available.
*
* @param string $session_id
* @return bool
*/
protected function _get_lock($session_id)
{
if ( ! extension_loaded('sysvsem'))
{
$this->_lock = TRUE;
return TRUE;
}
if (($this->_lock = sem_get($session_id.($this->_config['match_ip'] ? '_'.$_SERVER['REMOTE_ADDR'] : ''), 1, 0644)) === FALSE)
{
return FALSE;
}
if ( ! sem_acquire($this->_lock))
{
sem_remove($this->_lock);
$this->_lock = FALSE;
return FALSE;
}
return TRUE;
}
// ------------------------------------------------------------------------
/**
* Release lock
*
* @return bool
*/
protected function _release_lock()
{
if (extension_loaded('sysvsem') && $this->_lock)
{
sem_release($this->_lock);
sem_remove($this->_lock);
$this->_lock = FALSE;
}
return TRUE;
}
}
/* End of file Session_driver.php */
/* Location: ./system/libraries/Session/Session_driver.php */
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