Method writeProcessIdFile

/**
 * Method to write the process id file out to disk.
 *
 * @return  boolean
 *
 * @since   1.7.0
 */
protected function writeProcessIdFile()
{
    // Verify the process id is valid.
    if ($this->processId < 1) {
        Log::add('The process id is invalid.', Log::EMERGENCY);
        return false;
    }
    // Get the application process id file path.
    $file = $this->config->get('application_pid_file');
    if (empty($file)) {
        Log::add('The process id file path is empty.', Log::ERROR);
        return false;
    }
    // Make sure that the folder where we are writing the process id file exists.
    $folder = \dirname($file);
    if (!is_dir($folder) && !Folder::create($folder)) {
        Log::add('Unable to create directory: ' . $folder, Log::ERROR);
        return false;
    }
    // Write the process id file out to disk.
    if (!file_put_contents($file, $this->processId)) {
        Log::add('Unable to write process id file: ' . $file, Log::ERROR);
        return false;
    }
    // Make sure the permissions for the process id file are accurate.
    if (!chmod($file, 0644)) {
        Log::add('Unable to adjust permissions for the process id file: ' . $file, Log::ERROR);
        return false;
    }
    return true;
}