daemontaks

deamontask.php

<?php 
// http://bakery.cakephp.org/articles/reconbot/2008/08/26/daemontask
class DaemonTask extends Shell {

   function execute($prefix = '') {
           //the key the pid is stored with - default to just 'pid'
           $pidstring = $prefix . 'pid';
        if(!Cache::read($pidstring)){
            Cache::write($pidstring, getmypid(), 3600);    
        }else{
            $ps = shell_exec('ps -o pid -A');
            $ps = explode("\n", trim($ps));
            foreach($ps as $key => $value){
                $ps[$key] = trim($value);
            }
            if(in_array(Cache::read($pidstring), $ps)){
                exit("already got a process running\n");
            }else{
                echo "replacing stale pid\n";
                Cache::write($pidstring, getmypid(), 3600);    
            }
        }
    }
}
?>