UnixPipes.php

<?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 {
    public function __construct(?bool $ttyMode, bool $ptyMode, mixed $input, bool $haveReadSupport) {
        parent::__construct($input);
    }
    public function __sleep() : array {
        throw new \BadMethodCallException('Cannot serialize ' . __CLASS__);
    }
    public function __wakeup() : void {
        throw new \BadMethodCallException('Cannot unserialize ' . __CLASS__);
    }
    public function __destruct() {
        $this->close();
    }
    public function getDescriptors() : array {
        if (!$this->haveReadSupport) {
            $nullstream = fopen('/dev/null', 'c');
            return [
                [
                    'pipe',
                    'r',
                ],
                $nullstream,
                $nullstream,
            ];
        }
        if ($this->ttyMode) {
            return [
                [
                    'file',
                    '/dev/tty',
                    'r',
                ],
                [
                    'file',
                    '/dev/tty',
                    'w',
                ],
                [
                    'file',
                    '/dev/tty',
                    'w',
                ],
            ];
        }
        if ($this->ptyMode && Process::isPtySupported()) {
            return [
                [
                    'pty',
                ],
                [
                    'pty',
                ],
                [
                    'pty',
                ],
            ];
        }
        return [
            [
                'pipe',
                'r',
            ],
            [
                'pipe',
                'w',
            ],
            // stdout
[
                'pipe',
                'w',
            ],
        ];
    }
    public function getFiles() : array {
        return [];
    }
    public function readAndWrite(bool $blocking, bool $close = false) : array {
        $this->unblock();
        $w = $this->write();
        $read = $e = [];
        $r = $this->pipes;
        unset($r[0]);
        // let's have a look if something changed in streams
        set_error_handler($this->handleError(...));
        if (($r || $w) && false === stream_select($r, $w, $e, 0, $blocking ? Process::TIMEOUT_PRECISION * 1000000.0 : 0)) {
            restore_error_handler();
            // if a system call has been interrupted, forget about it, let's try again
            // otherwise, an error occurred, let's reset pipes
            if (!$this->hasSystemCallBeenInterrupted()) {
                $this->pipes = [];
            }
            return $read;
        }
        restore_error_handler();
        foreach ($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;
    }
    public function haveReadSupport() : bool {
        return $this->haveReadSupport;
    }
    public function areOpen() : bool {
        return (bool) $this->pipes;
    }

}