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3 liveuser 1 
<?php
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namespace React\Tests\EventLoop;
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use React\EventLoop\LibEventLoop;
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class LibEventLoopTest extends AbstractLoopTest
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{
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    private $fifoPath;
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    public function createLoop()
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    {
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        if ('Linux' === PHP_OS && !extension_loaded('posix')) {
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            $this->markTestSkipped('libevent tests skipped on linux due to linux epoll issues.');
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        }
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        if (!function_exists('event_base_new')) {
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            $this->markTestSkipped('libevent tests skipped because ext-libevent is not installed.');
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        }
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        return new LibEventLoop();
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    }
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    public function tearDown()
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    {
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        if (file_exists($this->fifoPath)) {
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            unlink($this->fifoPath);
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        }
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    }
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    public function createStream()
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    {
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        if ('Linux' !== PHP_OS) {
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            return parent::createStream();
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        }
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        $this->fifoPath = tempnam(sys_get_temp_dir(), 'react-');
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        unlink($this->fifoPath);
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        // Use a FIFO on linux to get around lack of support for disk-based file
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        // descriptors when using the EPOLL back-end.
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        posix_mkfifo($this->fifoPath, 0600);
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        $stream = fopen($this->fifoPath, 'r+');
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        return $stream;
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    }
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    public function writeToStream($stream, $content)
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    {
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        if ('Linux' !== PHP_OS) {
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            return parent::writeToStream($stream, $content);
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        }
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        fwrite($stream, $content);
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    }
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}