144 lines
3.6 KiB
PHP
144 lines
3.6 KiB
PHP
<?php
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/*
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* This file is part of the Symfony package.
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*
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* (c) Fabien Potencier <fabien@symfony.com>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace Symfony\Component\Process\Pipes;
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/**
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* @author Romain Neutron <imprec@gmail.com>
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*
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* @internal
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*/
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abstract class AbstractPipes implements PipesInterface
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{
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/** @var array */
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public $pipes = array();
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/** @var string */
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private $inputBuffer = '';
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/** @var resource|null */
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private $input;
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/** @var bool */
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private $blocked = true;
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public function __construct($input)
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{
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if (is_resource($input)) {
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$this->input = $input;
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} elseif (is_string($input)) {
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$this->inputBuffer = $input;
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} else {
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$this->inputBuffer = (string) $input;
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}
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}
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/**
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* {@inheritdoc}
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*/
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public function close()
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{
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foreach ($this->pipes as $pipe) {
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fclose($pipe);
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}
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$this->pipes = array();
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}
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/**
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* Returns true if a system call has been interrupted.
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*
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* @return bool
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*/
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protected function hasSystemCallBeenInterrupted()
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{
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$lastError = error_get_last();
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// stream_select returns false when the `select` system call is interrupted by an incoming signal
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return isset($lastError['message']) && false !== stripos($lastError['message'], 'interrupted system call');
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}
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/**
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* Unblocks streams.
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*/
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protected function unblock()
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{
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if (!$this->blocked) {
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return;
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}
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foreach ($this->pipes as $pipe) {
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stream_set_blocking($pipe, 0);
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}
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if (null !== $this->input) {
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stream_set_blocking($this->input, 0);
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}
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$this->blocked = false;
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}
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/**
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* Writes input to stdin.
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*/
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protected function write()
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{
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if (!isset($this->pipes[0])) {
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return;
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}
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$input = $this->input;
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$r = $e = array();
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$w = array($this->pipes[0]);
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// let's have a look if something changed in streams
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if (false === $n = @stream_select($r, $w, $e, 0, 0)) {
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return;
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}
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foreach ($w as $stdin) {
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if (isset($this->inputBuffer[0])) {
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$written = fwrite($stdin, $this->inputBuffer);
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$this->inputBuffer = substr($this->inputBuffer, $written);
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if (isset($this->inputBuffer[0])) {
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return array($this->pipes[0]);
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}
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}
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if ($input) {
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for (;;) {
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$data = fread($input, self::CHUNK_SIZE);
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if (!isset($data[0])) {
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break;
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}
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$written = fwrite($stdin, $data);
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$data = substr($data, $written);
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if (isset($data[0])) {
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$this->inputBuffer = $data;
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return array($this->pipes[0]);
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}
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}
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if (feof($input)) {
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// no more data to read on input resource
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// use an empty buffer in the next reads
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$this->input = null;
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}
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}
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}
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// no input to read on resource, buffer is empty
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if (null === $this->input && !isset($this->inputBuffer[0])) {
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fclose($this->pipes[0]);
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unset($this->pipes[0]);
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}
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if (!$w) {
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return array($this->pipes[0]);
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}
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}
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}
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