-
Notifications
You must be signed in to change notification settings - Fork 108
/
udev-example.py
executable file
·59 lines (46 loc) · 1.7 KB
/
udev-example.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
#!/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 "py-evdev-uinput" in name:
if udev.action == "add":
print("Device added: %s" % udev)
fds[dev.fd] = InputDevice(udev.device_node)
break
if udev.action == "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()()