Resque_Worker::killChild PHP Method

    public function killChild()
    {
        if (!$this->child) {
            $this->logger->log(Psr\Log\LogLevel::DEBUG, 'No child to kill.');
            return;
        }
        $this->logger->log(Psr\Log\LogLevel::INFO, 'Killing child at {child}', array('child' => $this->child));
        if (exec('ps -o pid,state -p ' . $this->child, $output, $returnCode) && $returnCode != 1) {
            $this->logger->log(Psr\Log\LogLevel::DEBUG, 'Child {child} found, killing.', array('child' => $this->child));
            posix_kill($this->child, SIGKILL);
            $this->child = null;
        } else {
            $this->logger->log(Psr\Log\LogLevel::INFO, 'Child {child} not found, restarting.', array('child' => $this->child));
            $this->shutdown();
        }
    }