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Wait up to two seconds for input device to become available. #215

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merged 1 commit into from
Apr 1, 2024
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Wait up to two seconds for input device to become available. #215

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19 changes: 14 additions & 5 deletions evdev/uinput.py
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Original file line number Diff line number Diff line change
Expand Up @@ -330,11 +330,20 @@ def _find_device_linux(self, sysname):
# It is possible that there is some delay before /dev/input/event* shows
# up on old systems that do not use devtmpfs, so if the device cannot be
# found, wait for a short amount and then try again once.
try:
return device.InputDevice(device_path)
except FileNotFoundError:
time.sleep(0.1)
return device.InputDevice(device_path)
#
# Furthermore, even if devtmpfs is in use, it is possible that the device
# does show up immediately, but without the correct permissions that
# still need to be set by udev. Wait for up to two seconds for either the
# device to show up or the permissions to be set.
for attempt in range(19):
try:
return device.InputDevice(device_path)
except (FileNotFoundError, PermissionError):
time.sleep(0.1)

# Last attempt. If this fails, whatever exception the last attempt raises
# shall be the exception that this function raises.
return device.InputDevice(device_path)

def _find_device_fallback(self):
"""
Expand Down