Daemon.class.php:
<?php
/**
* @package binarychoice.system.unix
* @since 1.0
*/
// Log message levels
/**
* Daemon base class
*
* Requirements:
* Unix like operating system
* php 4 >= 4.3.0 or php 5
* php compiled with:
* --enable-sigchild
* --enable-pcntl
*
* @package binarychoice.system.unix
* @author Michal 'Seth' Golebiowski <seth@binarychoice.pl>
* @copyright Copyright 2005 BinaryChoice
* @since 1.0
*/
class Daemon
{
/**#@+
* @access public
*/
/**
* User ID
* @var int
* @since 1.0
*/
var $userID = 99;
/**
* Group ID
* @var integer
* @since 1.0
*/
var $groupID = 99;
/**
* Path to PID file name
* @var string
* @since 1.0
*/
var $pidFullPath = '/tmp/daemon.pid';
/**
* Home path
* @var string
* @since 1.0
*/
var $homePath = '/';
/**#@-*/
/**#@+
* @access private
*/
/**
* Current process ID
* @var int
* @since 1.0
*/
var $_pid = 0;
/**
* Is this process a children
* @var boolean
* @since 1.0
*/
var $_isChildren = false;
/**
* Is daemon running
* @var boolean
* @since 1.0
*/
var $_isRunning = false;
/**#@-*/
/**
* Constructor
*
* @access public
* @since 1.0
* @return void
*/
function Daemon()
{
register_shutdown_function
(array(&$this, 'releaseDaemon')); }
/**
* Starts daemon
*
* @access public
* @since 1.0
* @return void
*/
function start()
{
$this->_logMessage('Starting daemon');
if (!$this->_daemonize())
{
$this>_logMessage('Could not start daemon', DLOG_ERROR);
return false;
}
$this->_logMessage('Running...');
$this->_isRunning = true;
while ($this->_isRunning)
{
$this->_doTask();
}
return true;
}
/**
* Stops daemon
*
* @access public
* @since 1.0
* @return void
*/
function stop()
{
$this->_logMessage('Stoping daemon');
$this->_isRunning = false;
}
/**
* Do task
*
* @access protected
* @since 1.0
* @return void
*/
function _doTask()
{
}
/**
* Logs message
*
* @access protected
* @since 1.0
* @return void
*/
function _logMessage($msg, $level = DLOG_NOTICE)
{
}
/**
* Daemonize
*
* @access private
* @since 1.0
* @return void
*/
function _daemonize()
{
$this->_setIdentity();
if ($this->_isDaemonAlreadyRunning())
{
return false;
}
if (!$this->_fork())
{
return false;
}
if (!posix_setsid())
{
$this->_logMessage('Could not make the current process a session leader', DLOG_ERROR);
return false;
}
if ( !$fp = fopen($this->pidFullPath, 'w') ) {
$this->_logMessage('Could not write to PID file', DLOG_ERROR);
return false;
}
else
{
}
pcntl_signal
(SIGCHLD
, array(&$this, 'sigHandler')); pcntl_signal
(SIGTERM
, array(&$this, 'sigHandler'));
return true;
}
/**
* Cheks is daemon already running
*
* @access private
* @since 1.0
* @return bool
*/
function _isDaemonAlreadyRunning()
{
if ($oldPid !== false && posix_kill
(trim($oldPid),0
)) {
$this->_logMessage('Daemon already running with PID: '.$oldPid, (DLOG_TO_CONSOLE | DLOG_ERROR));
return true;
}
else
{
return false;
}
}
/**
* Forks process
*
* @access private
* @since 1.0
* @return bool
*/
function _fork()
{
$this->_logMessage('Forking...');
$pid = pcntl_fork();
if ($pid == -1)
{
$this->_logMessage('Could not fork', DLOG_ERROR);
return false;
}
else if ($pid)
{
$this->_logMessage('Killing parent');
}
else
{
$this->_isChildren = true;
$this->_pid = posix_getpid();
return true;
}
}
/**
* Sets identity of a daemon and returns result
*
* @access private
* @since 1.0
* @return bool
*/
function _setIdentity()
{
if (!posix_setgid($this->groupID) || !posix_setuid($this->userID))
{
$this->_logMessage('Could not set identity', DLOG_WARNING);
return false;
}
else
{
return true;
}
}
/**
* Signals handler
*
* @access public
* @since 1.0
* @return void
*/
function sigHandler($sigNo)
{
switch ($sigNo)
{
case SIGTERM: // Shutdown
$this->_logMessage('Shutdown signal');
break;
case SIGCHLD: // Halt
$this->_logMessage('Halt signal');
while (pcntl_waitpid(-1, $status, WNOHANG) > 0);
break;
}
}
/**
* Releases daemon pid file
* This method is called on exit
*
* @access public
* @since 1.0
* @return void
*/
function releaseDaemon()
{
if (!$this->_isChildren
&& file_exists($this->$pidFileName)) {
$this->_logMessage('Releasing daemon');
}
}
}
?>
Prosty przyklad demona (TestDaemon.class.php):
<?php
class TestDaemon extends Daemon
{
function TestDaemon()
{
parent::Daemon();
$fp = fopen('/tmp/daemon.log', 'a');
chmod('/tmp/daemon.log', 0777);
}
function _logMessage($msg, $status = DLOG_NOTICE)
{
if ($status & DLOG_TO_CONSOLE)
{
}
$fp = fopen('/tmp/daemon.log', 'a'); fwrite($fp, date(\"Y/m/d H:i:s \").$msg.\"n\"); }
function _doTask()
{
$i++;
if ($i >= 30)
{
$this->stop();
}
}
}
?>
Plik uruchamiajacy testowego demona (run.php):
<?php
require_once ('Daemon.class.php');
require_once ('TestDaemon.class.php');
$Daemon = new TestDaemon();
$Daemon->start();
?>
run.php uruchamiamy oczywiscie z konsoli.
Wiecej infromacji na mojej stronie domowej