T = threading.Thread(target=self.read_events, kwargs=). With open( ' /proc/bus/input/devices ') as f:įor handlers in re.findall( r""" H: Handlers=(+) """, devices_file_contents, re.DOTALL):ĭev_event_file = ' /dev/input/event ' + re.search( r' event(\d+) ', handlers).group( 1)
Here is a stripped down version of how it detects key events on Linux: import signal Root privileges to detect they key release event? Really? You obviously don't need to be root to detect when a key is pressed, so why do you need root to detect when it gets released? Why does such a fundamental and common event require root access? Furthermore, why do we also get all events from every window regardless of whether it has focus or not? Well, let's take a look at what the python 'keyboard' module is doing internally. Now, if you run the above program, you'll find that it requires root privileges. Print( " Got key release event: " + str(e)) Self.done = True def my_on_key_event(self, e): Time.sleep( 1) # Wait for Ctrl+C def cleanup(self, signum, frame): Signal.signal(signal.SIGINT, self.cleanup) If you're just here for a quick python solution to detect keyup/keydown events in a Linux terminal/console environment, you can use the 'keyboard' package: # At least one of these should work with python2:Īnd here is a corresponding example program that will print a message on key release and key press down: import signal The Simplest Way To Detect Key Release Anywhere in Linux
If you don't care about minimizing latency and are ok with some false positive, see this section. Therefore, if you're doing this over an SSH connection, you'll need to use X forwarding, which may not be possible if your remote client is a headless server, or a constrained embedded system.
#METEOR KEYUP EVENT SOFTWARE#
#METEOR KEYUP EVENT CODE#
Several techniques and code examples will be shown that are capable of detecting the keyup event on Linux (with and without an X server), but all techniques presented here have significant limitations due to historical reasons that will be discussed. This article is dedicated to discussing why it's so hard to detect the 'key up' or 'key release' event in a Linux terminal environment without relying on X server. Why Is It so Hard to Detect Keyup Event on Linux? - By Robert Elder Introduction