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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;
/**
* @author Romain Neutron <imprec@gmail.com>
*
* @internal
*/
abstract class AbstractPipes implements PipesInterface
{
/** @var array */
public $pipes = array();
/** @var string */
private $inputBuffer = '';
/** @var resource|null */
private $input;
/** @var bool */
private $blocked = true;
public function __construct($input)
{
if (is_resource($input)) {
$this->input = $input;
} elseif (is_string($input)) {
$this->inputBuffer = $input;
} else {
$this->inputBuffer = (string) $input;
}
}
/**
* {@inheritdoc}
*/
public function close()
{
foreach ($this->pipes as $pipe) {
fclose($pipe);
}
$this->pipes = array();
}
/**
* Returns true if a system call has been interrupted.
*
* @return bool
*/
protected function hasSystemCallBeenInterrupted()
{
$lastError = error_get_last();
// stream_select returns false when the `select` system call is interrupted by an incoming signal
return isset($lastError['message']) && false !== stripos($lastError['message'], 'interrupted system call');
}
/**
* Unblocks streams.
*/
protected function unblock()
{
if (!$this->blocked) {
return;
}
foreach ($this->pipes as $pipe) {
stream_set_blocking($pipe, 0);
}
if (null !== $this->input) {
stream_set_blocking($this->input, 0);
}
$this->blocked = false;
}
/**
* Writes input to stdin.
*/
protected function write()
{
if (!isset($this->pipes[0])) {
return;
}
$input = $this->input;
$r = $e = array();
$w = array($this->pipes[0]);
// let's have a look if something changed in streams
if (false === $n = @stream_select($r, $w, $e, 0, 0)) {
return;
}
foreach ($w as $stdin) {
if (isset($this->inputBuffer[0])) {
$written = fwrite($stdin, $this->inputBuffer);
$this->inputBuffer = substr($this->inputBuffer, $written);
if (isset($this->inputBuffer[0])) {
return array($this->pipes[0]);
}
}
if ($input) {
for (;;) {
$data = fread($input, self::CHUNK_SIZE);
if (!isset($data[0])) {
break;
}
$written = fwrite($stdin, $data);
$data = substr($data, $written);
if (isset($data[0])) {
$this->inputBuffer = $data;
return array($this->pipes[0]);
}
}
if (feof($input)) {
// no more data to read on input resource
// use an empty buffer in the next reads
$this->input = null;
}
}
}
// no input to read on resource, buffer is empty
if (null === $this->input && !isset($this->inputBuffer[0])) {
fclose($this->pipes[0]);
unset($this->pipes[0]);
}
if (!$w) {
return array($this->pipes[0]);
}
}
}