<?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\Exception\RuntimeException;
use Symfony\Component\Process\Process;
/**
* WindowsPipes implementation uses temporary files as handles.
*
* @see https://bugs.php.net/51800
* @see https://bugs.php.net/65650
*
* @author Romain Neutron <imprec@gmail.com>
*
* @internal
*/
class WindowsPipes extends AbstractPipes
{
private $files = [];
private $fileHandles = [];
private $lockHandles = [];
private $readBytes = [
Process::STDOUT => 0,
Process::STDERR => 0,
];
private $haveReadSupport;
public function __construct($input, bool $haveReadSupport)
{
$this->haveReadSupport = $haveReadSupport;
if ($this->haveReadSupport) {
// Fix for PHP bug #51800: reading from STDOUT pipe hangs forever on Windows if the output is too big.
// Workaround for this problem is to use temporary files instead of pipes on Windows platform.
//
// @see https://bugs.php.net/51800
$pipes = [
Process::STDOUT => Process::OUT,
Process::STDERR => Process::ERR,
];
$tmpDir = sys_get_temp_dir();
$lastError = 'unknown reason';
set_error_handler(function ($type, $msg) use (&$lastError) { $lastError = $msg; });
for ($i = 0;; ++$i) {
foreach ($pipes as $pipe => $name) {
$file = sprintf('%s\\sf_proc_%02X.%s', $tmpDir, $i, $name);
if (!$h = fopen($file.'.lock', 'w')) {
if (file_exists($file.'.lock')) {
continue 2;
}
restore_error_handler();
throw new RuntimeException('A temporary file could not be opened to write the process output: '.$lastError);
}
if (!flock($h, \LOCK_EX | \LOCK_NB)) {
continue 2;
}
if (isset($this->lockHandles[$pipe])) {
flock($this->lockHandles[$pipe], \LOCK_UN);
fclose($this->lockHandles[$pipe]);
}
$this->lockHandles[$pipe] = $h;
if (!fclose(fopen($file, 'w')) || !$h = fopen($file, 'r')) {
flock($this->lockHandles[$pipe], \LOCK_UN);
fclose($this->lockHandles[$pipe]);
unset($this->lockHandles[$pipe]);
continue 2;
}
$this->fileHandles[$pipe] = $h;
$this->files[$pipe] = $file;
}
break;
}
restore_error_handler();
}
parent::__construct($input);
}
public function __destruct()
{
$this->close();
}
/**
* {@inheritdoc}
*/
public function getDescriptors(): array
{
if (!$this->haveReadSupport) {
$nullstream = fopen('NUL', 'c');
return [
['pipe', 'r'],
$nullstream,
$nullstream,
];
}
// We're not using pipe on Windows platform as it hangs (https://bugs.php.net/51800)
// We're not using file handles as it can produce corrupted output https://bugs.php.net/65650
// So we redirect output within the commandline and pass the nul device to the process
return [
['pipe', 'r'],
['file', 'NUL', 'w'],
['file', 'NUL', 'w'],
];
}
/**
* {@inheritdoc}
*/
public function getFiles(): array
{
return $this->files;
}
/**
* {@inheritdoc}
*/
public function readAndWrite(bool $blocking, bool $close = false): array
{
$this->unblock();
$w = $this->write();
$read = $r = $e = [];
if ($blocking) {
if ($w) {
@stream_select($r, $w, $e, 0, Process::TIMEOUT_PRECISION * 1E6);
} elseif ($this->fileHandles) {
usleep(Process::TIMEOUT_PRECISION * 1E6);
}
}
foreach ($this->fileHandles as $type => $fileHandle) {
$data = stream_get_contents($fileHandle, -1, $this->readBytes[$type]);
if (isset($data[0])) {
$this->readBytes[$type] += \strlen($data);
$read[$type] = $data;
}
if ($close) {
ftruncate($fileHandle, 0);
fclose($fileHandle);
flock($this->lockHandles[$type], \LOCK_UN);
fclose($this->lockHandles[$type]);
unset($this->fileHandles[$type], $this->lockHandles[$type]);
}
}
return $read;
}
/**
* {@inheritdoc}
*/
public function haveReadSupport(): bool
{
return $this->haveReadSupport;
}
/**
* {@inheritdoc}
*/
public function areOpen(): bool
{
return $this->pipes && $this->fileHandles;
}
/**
* {@inheritdoc}
*/
public function close()
{
parent::close();
foreach ($this->fileHandles as $type => $handle) {
ftruncate($handle, 0);
fclose($handle);
flock($this->lockHandles[$type], \LOCK_UN);
fclose($this->lockHandles[$type]);
}
$this->fileHandles = $this->lockHandles = [];
}
}