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diff --git a/vendor/symfony/process/Pipes/UnixPipes.php b/vendor/symfony/process/Pipes/UnixPipes.php
new file mode 100644
index 000000000..c4babcdf5
--- /dev/null
+++ b/vendor/symfony/process/Pipes/UnixPipes.php
@@ -0,0 +1,158 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Process\Pipes;
+
+use Symfony\Component\Process\Process;
+
+/**
+ * UnixPipes implementation uses unix pipes as handles.
+ *
+ * @author Romain Neutron <imprec@gmail.com>
+ *
+ * @internal
+ */
+class UnixPipes extends AbstractPipes
+{
+    /** @var bool */
+    private $ttyMode;
+    /** @var bool */
+    private $ptyMode;
+    /** @var bool */
+    private $disableOutput;
+
+    public function __construct($ttyMode, $ptyMode, $input, $disableOutput)
+    {
+        $this->ttyMode = (bool) $ttyMode;
+        $this->ptyMode = (bool) $ptyMode;
+        $this->disableOutput = (bool) $disableOutput;
+
+        parent::__construct($input);
+    }
+
+    public function __destruct()
+    {
+        $this->close();
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getDescriptors()
+    {
+        if ($this->disableOutput) {
+            $nullstream = fopen('/dev/null', 'c');
+
+            return array(
+                array('pipe', 'r'),
+                $nullstream,
+                $nullstream,
+            );
+        }
+
+        if ($this->ttyMode) {
+            return array(
+                array('file', '/dev/tty', 'r'),
+                array('file', '/dev/tty', 'w'),
+                array('file', '/dev/tty', 'w'),
+            );
+        }
+
+        if ($this->ptyMode && Process::isPtySupported()) {
+            return array(
+                array('pty'),
+                array('pty'),
+                array('pty'),
+            );
+        }
+
+        return array(
+            array('pipe', 'r'),
+            array('pipe', 'w'), // stdout
+            array('pipe', 'w'), // stderr
+        );
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getFiles()
+    {
+        return array();
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function readAndWrite($blocking, $close = false)
+    {
+        $this->unblock();
+        $w = $this->write();
+
+        $read = $e = array();
+        $r = $this->pipes;
+        unset($r[0]);
+
+        // let's have a look if something changed in streams
+        if (($r || $w) && false === $n = @stream_select($r, $w, $e, 0, $blocking ? Process::TIMEOUT_PRECISION * 1E6 : 0)) {
+            // if a system call has been interrupted, forget about it, let's try again
+            // otherwise, an error occurred, let's reset pipes
+            if (!$this->hasSystemCallBeenInterrupted()) {
+                $this->pipes = array();
+            }
+
+            return $read;
+        }
+
+        foreach ($r as $pipe) {
+            // prior PHP 5.4 the array passed to stream_select is modified and
+            // lose key association, we have to find back the key
+            $read[$type = array_search($pipe, $this->pipes, true)] = '';
+
+            do {
+                $data = fread($pipe, self::CHUNK_SIZE);
+                $read[$type] .= $data;
+            } while (isset($data[0]) && ($close || isset($data[self::CHUNK_SIZE - 1])));
+
+            if (!isset($read[$type][0])) {
+                unset($read[$type]);
+            }
+
+            if ($close && feof($pipe)) {
+                fclose($pipe);
+                unset($this->pipes[$type]);
+            }
+        }
+
+        return $read;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function areOpen()
+    {
+        return (bool) $this->pipes;
+    }
+
+    /**
+     * Creates a new UnixPipes instance.
+     *
+     * @param Process         $process
+     * @param string|resource $input
+     *
+     * @return static
+     */
+    public static function create(Process $process, $input)
+    {
+        return new static($process->isTty(), $process->isPty(), $input, $process->isOutputDisabled());
+    }
+}