--- /dev/null
+<?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;
+
+/**
+ * PipesInterface manages descriptors and pipes for the use of proc_open.
+ *
+ * @author Romain Neutron <imprec@gmail.com>
+ *
+ * @internal
+ */
+interface PipesInterface
+{
+ const CHUNK_SIZE = 16384;
+
+ /**
+ * Returns an array of descriptors for the use of proc_open.
+ *
+ * @return array
+ */
+ public function getDescriptors();
+
+ /**
+ * Returns an array of filenames indexed by their related stream in case these pipes use temporary files.
+ *
+ * @return string[]
+ */
+ public function getFiles();
+
+ /**
+ * Reads data in file handles and pipes.
+ *
+ * @param bool $blocking Whether to use blocking calls or not
+ * @param bool $close Whether to close pipes if they've reached EOF
+ *
+ * @return string[] An array of read data indexed by their fd
+ */
+ public function readAndWrite($blocking, $close = false);
+
+ /**
+ * Returns if the current state has open file handles or pipes.
+ *
+ * @return bool
+ */
+ public function areOpen();
+
+ /**
+ * Closes file handles and pipes.
+ */
+ public function close();
+}