<?php

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/*

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* This file is part of the Symfony package.

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*

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* (c) Fabien Potencier <fabien@symfony.com>

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*

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* For the full copyright and license information, please view the LICENSE

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* file that was distributed with this source code.

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*/

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namespace Symfony\Component\Process\Pipes;

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use Symfony\Component\Process\Process;

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/**

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* UnixPipes implementation uses unix pipes as handles.

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*

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* @author Romain Neutron <imprec@gmail.com>

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*

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* @internal

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*/

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class UnixPipes extends AbstractPipes

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{

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private $ttyMode;

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private $ptyMode;

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private $haveReadSupport;

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public function __construct($ttyMode, $ptyMode, $input, $haveReadSupport)

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{

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$this->ttyMode = (bool) $ttyMode;

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$this->ptyMode = (bool) $ptyMode;

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$this->haveReadSupport = (bool) $haveReadSupport;

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parent::__construct($input);

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}

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public function __destruct()

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{

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$this->close();

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}

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/**

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* {@inheritdoc}

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*/

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public function getDescriptors()

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{

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if (!$this->haveReadSupport) {

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$nullstream = fopen('/dev/null', 'c');

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return [

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['pipe', 'r'],

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$nullstream,

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$nullstream,

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];

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}

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if ($this->ttyMode) {

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return [

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['file', '/dev/tty', 'r'],

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['file', '/dev/tty', 'w'],

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['file', '/dev/tty', 'w'],

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];

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}

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if ($this->ptyMode && Process::isPtySupported()) {

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return [

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['pty'],

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['pty'],

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['pty'],

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];

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}

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return [

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['pipe', 'r'],

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['pipe', 'w'], // stdout

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['pipe', 'w'], // stderr

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];

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}

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/**

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* {@inheritdoc}

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*/

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public function getFiles()

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{

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return [];

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}

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/**

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* {@inheritdoc}

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*/

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public function readAndWrite($blocking, $close = false)

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{

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$this->unblock();

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$w = $this->write();

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$read = $e = [];

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$r = $this->pipes;

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unset($r[0]);

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// let's have a look if something changed in streams

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set_error_handler([$this, 'handleError']);

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if (($r || $w) && false === stream_select($r, $w, $e, 0, $blocking ? Process::TIMEOUT_PRECISION * 1E6 : 0)) {

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restore_error_handler();

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// if a system call has been interrupted, forget about it, let's try again

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// otherwise, an error occurred, let's reset pipes

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if (!$this->hasSystemCallBeenInterrupted()) {

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$this->pipes = [];

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}

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return $read;

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}

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restore_error_handler();

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foreach ($r as $pipe) {

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// prior PHP 5.4 the array passed to stream_select is modified and

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// lose key association, we have to find back the key

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$read[$type = array_search($pipe, $this->pipes, true)] = '';

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do {

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$data = @fread($pipe, self::CHUNK_SIZE);

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$read[$type] .= $data;

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} while (isset($data[0]) && ($close || isset($data[self::CHUNK_SIZE - 1])));

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if (!isset($read[$type][0])) {

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unset($read[$type]);

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}

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if ($close && feof($pipe)) {

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fclose($pipe);

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unset($this->pipes[$type]);

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}

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}

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return $read;

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}

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/**

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* {@inheritdoc}

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*/

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public function haveReadSupport()

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{

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return $this->haveReadSupport;

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}

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/**

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* {@inheritdoc}

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*/

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public function areOpen()

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{

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return (bool) $this->pipes;

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}

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}

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