Issue when using flock

[joshuaspence]

I have an issue using vfsStream with code that calls flock. The issue is best explained by the following code example:

<?php

require __DIR__.'/vendor/autoload.php';

use org\bovigo\vfs\vfsStream;

$root = vfsStream::setUp();

$path = $root->url().'/x';
//$path = '/tmp/x';

$handle_one = fopen($path, 'a+');
$handle_two = fopen($path, 'a+');

$would_block = null;

flock($handle_one, LOCK_EX | LOCK_NB, $would_block);
var_dump($would_block);

flock($handle_two, LOCK_EX | LOCK_NB, $would_block);
var_dump($would_block);

Using vfsStream (i.e. $path = $root->url().'/x'), the output from this script is:

int(0)
int(0)

Using $path = '/tmp/x', the output from this script is:

int(0)
int(1)

[mikey179]

I guess it is due to the fact the vfsStream doesn't block. It could be done, but currently it is not implemented. Also see #15.

[yurii-github]

today I came across this stuff myself. Any solution/workaround to this? I have checked vfsStream code and some lock logic is in place but I am not sure where to start digging for solution.

regards

"name": "mikey179/vfsstream",
"version": "v1.6.8",
"source": {
    "type": "git",
    "url": "https://github.com/bovigo/vfsStream.git",
    "reference": "231c73783ebb7dd9ec77916c10037eff5a2b6efe"
},

<?php

namespace Tests;

use org\bovigo\vfs\vfsStream;
use PHPUnit\Framework\TestCase;

class VirtualFileSystemTest extends TestCase
{
    public function testRealFS()
    {
        $filename = '/tmp/a.txt';
        
        $stream1 = fopen($filename, 'a+');
        $result1 = flock($stream1, LOCK_EX | LOCK_NB, $lock1);
        $stream2 = fopen($filename, 'a+');
        $result2 = flock($stream2, LOCK_EX | LOCK_NB, $lock2);
        
        $this->assertFileExists($filename);
        $this->assertSame(0, $lock1);
        $this->assertTrue($result1);
        $this->assertSame(1, $lock2);
        $this->assertFalse($result2);
    }

    public function testVirtualFS()
    {
        $root = vfsStream::setup();
        $filename = vfsStream::newFile('a.txt')->at($root)->url();

        $stream1 = fopen($filename, 'a+');
        $result1 = flock($stream1, LOCK_EX | LOCK_NB, $lock1);
        $stream2 = fopen($filename, 'a+');
        $result2 = flock($stream2, LOCK_EX | LOCK_NB, $lock2);

        $this->assertFileExists($filename);
        $this->assertSame(0, $lock1);
        $this->assertTrue($result1);
        $this->assertSame(1, $lock2); // this FAILS, because it is 0
        $this->assertFalse($result2); // this passes
    }
}