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

    public function readAndWrite($blocking, $close = false)
    {
        if (1 === count($this->pipes) && [0] === array_keys($this->pipes)) {
            fclose($this->pipes[0]);
            unset($this->pipes[0]);
        }
        if (empty($this->pipes)) {
            return [];
        }
        $this->unblock();
        $read = [];
        if (null !== $this->input) {
            $r = array_merge($this->pipes, ['input' => $this->input]);
        } else {
            $r = $this->pipes;
        }
        unset($r[0]);
        $w = isset($this->pipes[0]) ? [$this->pipes[0]] : null;
        $e = null;
        if (false === ($n = @stream_select($r, $w, $e, 0, $blocking ? Process::TIMEOUT_PRECISION * 1000000.0 : 0))) {
            if (!$this->hasSystemCallBeenInterrupted()) {
                $this->pipes = [];
            }
            return $read;
        }
        if (0 === $n) {
            return $read;
        }
        foreach ($r as $pipe) {
            $type = false !== ($found = array_search($pipe, $this->pipes)) ? $found : 'input';
            $data = '';
            while ('' !== ($dataread = (string) fread($pipe, self::CHUNK_SIZE))) {
                $data .= $dataread;
            }
            if ('' !== $data) {
                if ($type === 'input') {
                    $this->inputBuffer .= $data;
                } else {
                    $read[$type] = $data;
                }
            }
            if (false === $data || true === $close && feof($pipe) && '' === $data) {
                if ($type === 'input') {
                    $this->input = null;
                } else {
                    fclose($this->pipes[$type]);
                    unset($this->pipes[$type]);
                }
            }
        }
        if (null !== $w && 0 < count($w)) {
            while (strlen($this->inputBuffer)) {
                $written = fwrite($w[0], $this->inputBuffer, 2 << 18);
                // write 512k
                if ($written > 0) {
                    $this->inputBuffer = (string) substr($this->inputBuffer, $written);
                } else {
                    break;
                }
            }
        }
        if ('' === $this->inputBuffer && null === $this->input && isset($this->pipes[0])) {
            fclose($this->pipes[0]);
            unset($this->pipes[0]);
        }
        return $read;
    }