@extesy could you provide a failing test or an example code revealing the issue? Technically files should be automatically removed when fclose() is called or script finishes.

@jakzal It's quite hard to isolate the small repro case, but here's what I think is going on:

1. Task runner process (the one which spawns worker processes) is always running, so it won't remove temp files because of "script finishes" condition.
2. The only two places where fileHandles are closed are stop function which I don't use, and processFileHandles which has its $closeEmptyHandles parameter always set to false so it doesn't close handles either.

Actually, processFileHandles is not even being called. I pass $stdin=null to Process constructor and this code does an early return from the start function:

        if (null === $this->stdin) {
            fclose($this->pipes[0]);
            unset($this->pipes[0]);

            return;
        }

So fclose on fileHandles is not even called anywhere in the code path.

@extesy what are the exit statuses of these worker processes?

@romainneutron Can you have a look at this?

@extesy @mirkin Can you provide a test script that reproduce the issue systematically ?

I do not have Windows OS. I tried to reproduce your issue by using file handles explicitely without success, temporary files are removed on process destruction.

Ok, I'll try to repro it with a test script.