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#!/usr/bin/env python3
'''
This is an example of using pyudev[1] alongside evdev.
[1]: https://pyudev.readthedocs.org/
'''
import functools
import pyudev
from select import select
from evdev import InputDevice
context = pyudev.Context()
monitor = pyudev.Monitor.from_netlink(context)
monitor.filter_by(subsystem='input')
monitor.start()
fds = {monitor.fileno(): monitor}
finalizers = []
while True:
r, w, x = select(fds, [], [])
if monitor.fileno() in r:
r.remove(monitor.fileno())
for udev in iter(functools.partial(monitor.poll, 0), None):
# we're only interested in devices that have a device node
# (e.g. /dev/input/eventX)
if not udev.device_node:
break
# find the device we're interested in and add it to fds
for name in (i['NAME'] for i in udev.ancestors if 'NAME' in i):
# I used a virtual input device for this test - you
# should adapt this to your needs
if u'py-evdev-uinput' in name:
if udev.action == u'add':
print('Device added: %s' % udev)
fds[dev.fd] = InputDevice(udev.device_node)
break
if udev.action == u'remove':
print('Device removed: %s' % udev)
def helper():
global fds
fds = {monitor.fileno(): monitor}
finalizers.append(helper)
break
for fd in r:
dev = fds[fd]
for event in dev.read():
print(event)
for i in range(len(finalizers)):
finalizers.pop()()
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