--- /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;
+
+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());
+ }
+}