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<?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;
use Symfony\Component\Process\Exception\RuntimeException;
/**
* WindowsPipes implementation uses temporary files as handles.
*
* @see https://bugs.php.net/bug.php?id=51800
* @see https://bugs.php.net/bug.php?id=65650
*
* @author Romain Neutron <imprec@gmail.com>
*
* @internal
*/
class WindowsPipes extends AbstractPipes
{
/** @var array */
private $files = array();
/** @var array */
private $fileHandles = array();
/** @var array */
private $readBytes = array(
Process::STDOUT => 0,
Process::STDERR => 0,
);
/** @var bool */
private $disableOutput;
public function __construct($disableOutput, $input)
{
$this->disableOutput = (bool) $disableOutput;
if (!$this->disableOutput) {
// 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/bug.php?id=51800
$this->files = array(
Process::STDOUT => tempnam(sys_get_temp_dir(), 'sf_proc_stdout'),
Process::STDERR => tempnam(sys_get_temp_dir(), 'sf_proc_stderr'),
);
foreach ($this->files as $offset => $file) {
$this->fileHandles[$offset] = fopen($this->files[$offset], 'rb');
if (false === $this->fileHandles[$offset]) {
throw new RuntimeException('A temporary file could not be opened to write the process output to, verify that your TEMP environment variable is writable');
}
}
}
if (is_resource($input)) {
$this->input = $input;
} else {
$this->inputBuffer = $input;
}
}
public function __destruct()
{
$this->close();
$this->removeFiles();
}
/**
* {@inheritdoc}
*/
public function getDescriptors()
{
if ($this->disableOutput) {
$nullstream = fopen('NUL', 'c');
return array(
array('pipe', 'r'),
$nullstream,
$nullstream,
);
}
// We're not using pipe on Windows platform as it hangs (https://bugs.php.net/bug.php?id=51800)
// We're not using file handles as it can produce corrupted output https://bugs.php.net/bug.php?id=65650
// So we redirect output within the commandline and pass the nul device to the process
return array(
array('pipe', 'r'),
array('file', 'NUL', 'w'),
array('file', 'NUL', 'w'),
);
}
/**
* {@inheritdoc}
*/
public function getFiles()
{
return $this->files;
}
/**
* {@inheritdoc}
*/
public function readAndWrite($blocking, $close = false)
{
$this->write($blocking, $close);
$read = array();
$fh = $this->fileHandles;
foreach ($fh as $type => $fileHandle) {
if (0 !== fseek($fileHandle, $this->readBytes[$type])) {
continue;
}
$data = '';
$dataread = null;
while (!feof($fileHandle)) {
if (false !== $dataread = fread($fileHandle, self::CHUNK_SIZE)) {
$data .= $dataread;
}
}
if (0 < $length = strlen($data)) {
$this->readBytes[$type] += $length;
$read[$type] = $data;
}
if (false === $dataread || (true === $close && feof($fileHandle) && '' === $data)) {
fclose($this->fileHandles[$type]);
unset($this->fileHandles[$type]);
}
}
return $read;
}
/**
* {@inheritdoc}
*/
public function areOpen()
{
return (bool) $this->pipes && (bool) $this->fileHandles;
}
/**
* {@inheritdoc}
*/
public function close()
{
parent::close();
foreach ($this->fileHandles as $handle) {
fclose($handle);
}
$this->fileHandles = array();
}
/**
* Creates a new WindowsPipes instance.
*
* @param Process $process The process
* @param $input
*
* @return WindowsPipes
*/
public static function create(Process $process, $input)
{
return new static($process->isOutputDisabled(), $input);
}
/**
* Removes temporary files
*/
private function removeFiles()
{
foreach ($this->files as $filename) {
if (file_exists($filename)) {
@unlink($filename);
}
}
$this->files = array();
}
/**
* Writes input to stdin
*
* @param bool $blocking
* @param bool $close
*/
private function write($blocking, $close)
{
if (empty($this->pipes)) {
return;
}
$this->unblock();
$r = null !== $this->input ? array('input' => $this->input) : null;
$w = isset($this->pipes[0]) ? array($this->pipes[0]) : null;
$e = null;
// let's have a look if something changed in streams
if (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;
}
// nothing has changed
if (0 === $n) {
return;
}
if (null !== $w && 0 < count($r)) {
$data = '';
while ($dataread = fread($r['input'], self::CHUNK_SIZE)) {
$data .= $dataread;
}
$this->inputBuffer .= $data;
if (false === $data || (true === $close && feof($r['input']) && '' === $data)) {
// no more data to read on input resource
// use an empty buffer in the next reads
$this->input = null;
}
}
if (null !== $w && 0 < count($w)) {
while (strlen($this->inputBuffer)) {
$written = fwrite($w[0], $this->inputBuffer, 2 << 18);
if ($written > 0) {
$this->inputBuffer = (string) substr($this->inputBuffer, $written);
} else {
break;
}
}
}
// no input to read on resource, buffer is empty and stdin still open
if ('' === $this->inputBuffer && null === $this->input && isset($this->pipes[0])) {
fclose($this->pipes[0]);
unset($this->pipes[0]);
}
}
}
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