think\process\pipes\Unix::getDescriptors PHP Метод

    public function getDescriptors()
    {
        if ($this->disableOutput) {
            $nullstream = fopen('/dev/null', 'c');
            return [['pipe', 'r'], $nullstream, $nullstream];
        }
        if ($this->ttyMode) {
            return [['file', '/dev/tty', 'r'], ['file', '/dev/tty', 'w'], ['file', '/dev/tty', 'w']];
        }
        if ($this->ptyMode && Process::isPtySupported()) {
            return [['pty'], ['pty'], ['pty']];
        }
        return [['pipe', 'r'], ['pipe', 'w'], ['pipe', 'w']];
    }