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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;
/**
* UnixPipes implementation uses unix pipes as handles.
*
* @author Romain Neutron <imprec@gmail.com>
*
* @internal
*/
class UnixPipes extends AbstractPipes
{
/** @var bool */
private $ttyMode;
/** @var bool */
private $ptyMode;
/** @var bool */
private $disableOutput;
public function __construct($ttyMode, $ptyMode, $input, $disableOutput)
{
$this->ttyMode = (bool) $ttyMode;
$this->ptyMode = (bool) $ptyMode;
$this->disableOutput = (bool) $disableOutput;
if (is_resource($input)) {
$this->input = $input;
} else {
$this->inputBuffer = (string) $input;
}
}
public function __destruct()
{
$this->close();
}
/**
* {@inheritdoc}
*/
public function getDescriptors()
{
if ($this->disableOutput) {
$nullstream = fopen('/dev/null', 'c');
return array(
array('pipe', 'r'),
$nullstream,
$nullstream,
);
}
if ($this->ttyMode) {
return array(
array('file', '/dev/tty', 'r'),
array('file', '/dev/tty', 'w'),
array('file', '/dev/tty', 'w'),
);
}
if ($this->ptyMode && Process::isPtySupported()) {
return array(
array('pty'),
array('pty'),
array('pty'),
);
}
return array(
array('pipe', 'r'),
array('pipe', 'w'), // stdout
array('pipe', 'w'), // stderr
);
}
/**
* {@inheritdoc}
*/
public function getFiles()
{
return array();
}
/**
* {@inheritdoc}
*/
public function readAndWrite($blocking, $close = false)
{
// only stdin is left open, job has been done !
// we can now close it
if (1 === count($this->pipes) && array(0) === array_keys($this->pipes)) {
fclose($this->pipes[0]);
unset($this->pipes[0]);
}
if (empty($this->pipes)) {
return array();
}
$this->unblock();
$read = array();
if (null !== $this->input) {
// if input is a resource, let's add it to stream_select argument to
// fill a buffer
$r = array_merge($this->pipes, array('input' => $this->input));
} else {
$r = $this->pipes;
}
// discard read on stdin
unset($r[0]);
$w = isset($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 $read;
}
// nothing has changed
if (0 === $n) {
return $read;
}
foreach ($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
$type = (false !== $found = array_search($pipe, $this->pipes)) ? $found : 'input';
$data = '';
while ('' !== $dataread = (string) fread($pipe, self::CHUNK_SIZE)) {
$data .= $dataread;
}
if ('' !== $data) {
if ($type === 'input') {
$this->inputBuffer .= $data;
} else {
$read[$type] = $data;
}
}
if (false === $data || (true === $close && feof($pipe) && '' === $data)) {
if ($type === 'input') {
// no more data to read on input resource
// use an empty buffer in the next reads
$this->input = null;
} else {
fclose($this->pipes[$type]);
unset($this->pipes[$type]);
}
}
}
if (null !== $w && 0 < count($w)) {
while (strlen($this->inputBuffer)) {
$written = fwrite($w[0], $this->inputBuffer, 2 << 18); // write 512k
if ($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]);
}
return $read;
}
/**
* {@inheritdoc}
*/
public function areOpen()
{
return (bool) $this->pipes;
}
/**
* Creates a new UnixPipes instance.
*
* @param Process $process
* @param string|resource $input
*
* @return UnixPipes
*/
public static function create(Process $process, $input)
{
return new static($process->isTty(), $process->isPty(), $input, $process->isOutputDisabled());
}
}
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