I'm working on a PHP keylogger using the Linux evdev API (characted devices in /dev/input/).

I'm working on the React interface of the library, which is a specialization of my main class.
Using my main (non-React) class and logging the events, I can get this type of log when I press the space key one time (simplified output) :

-- handleData --   -> handleData called
key=57 value=1     -> keydown on space
-- handleData --
key=57 value=0     -> keyup on space

OK. I pressed space one time and I instantly get two events related to the space key. All good.

Now, using the React extend of my keylogger and doing the same key press :

-- handleData --
key=57 value=1     -> keydown on space

You can notice I don't get the keyup event. Nothing happens until I press another key. So, let's press space another time :

-- handleData --   -> previous log
key=57 value=1     -> previous log
-- handleData --
key=57 value=0     -> it is displayed only now!!
-- handleData --
key=57 value=1     -> ok, expected new keydown
                   -> missing new keyup... 'til I press another key

I was using EventLoop\Factory::create() to get the event loop. It was returning a LibEventLoop. I tried to force the loop class used by replacing the factory with the plain-PHP StreamSelectLoop. And it works perfectly with this loop class.

I can't try with LibEvLoop or ExtEventLoop since these libraries aren't installed on my system.

Maybe it's a quirk of LibEventLoop on character files?
I hope I'm clear enough !