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@blamh
Last active January 3, 2016 20:49
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PHP Class for running a script as daemon in Linux. The script is started in the background by itself, to stop the daemon use filename.xphp --stop.
<?php
/**
* Class for running a script as daemon in Linux. The script is started
* in the background by itself, to stop the daemon use filename.xphp --stop.
*
* $d = new Library_Cmd_Daemon('daemon.pid');
* $d->run(function() {
* while(1) {
* sleep(10);
* }
* });
*
*/
class Library_Cmd_Daemon
{
/**
* File path for the pid file-
*
* @var string
*/
private $pid_file;
/**
* The Process ID.
*
* @var int
*/
private $pid;
/**
* Flag to indicate if the process is in daemon mode
*/
private $daemon_mode = false;
/**
* Constructor
*
* @return void
*/
function __construct($pid_file)
{
$this->pid_file = $pid_file;
}
/**
* Destructor
*
* @return void
*/
function __destruct()
{
if ($this->daemon_mode) {
$this->clearPID();
}
}
/**
* Method for running the background code.
*
* @param Closure $func The code to be run.
*
* @return void
*/
function run($func)
{
$bgdaemon = $stop = false;
foreach ($_SERVER['argv'] as $e) {
switch ($e) {
case '--bgdaemon':
$bgdaemon = true;
break;
case '--stop':
$stop = true;
break;
case '--status':
print $this->isRunning() ?
"The daemon is running\n" : "The daemon is not running.\n";
return;
case '--help':
print "Available parameters are: --status and --stop.\n";
return;
}
}
// Check that the process is running
if (!$this->isRunning()) {
$this->clearPID();
}
// Kill the process
if ($stop) {
$this->stop();
return;
}
// Background daemon stuff.
if ($bgdaemon) {
$this->daemon_mode = true;
// Save the pid for later use.
file_put_contents($this->pid_file, getmypid());
$func();
return;
}
$args = array();
foreach ($_SERVER['argv'] as $k => $v) {
// Don't include the filename.
if ($k === 0) {
continue;
}
$args[] = $v;
}
$args_c = implode(' ', $args);
// daemonize
if (!$this->isRunning()) {
system("({$_SERVER["SCRIPT_NAME"]} $args_c --bgdaemon) >/dev/null &");
}
}
/**
* Detects if the process is running or not.
*
* @return bool
*/
public function isRunning()
{
$pid = (int)@file_get_contents($this->pid_file);
if ($pid === 0) {
return false;
}
if (posix_getsid($pid) === false) {
return false;
}
if (!file_exists("/proc/$pid/")) {
return false;
}
$this->pid = $pid;
return true;
}
/**
* Clears all the PID information from the obj and the disk.
*
* @return void
*/
private function clearPID()
{
@unlink($this->pid_file);
$this->pid = 0;
}
/**
* Method for stopping the running daemon.
*
* @return void
*/
private function stop()
{
if ($this->pid === 0) {
return;
}
posix_kill($this->pid, 9);
$this->clearPID();
}
}
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