Gamepad.notifyOnConnect listeners are not called on connection or disconnection of gamepads

[ghost]

Describe the bug After calling Gamepad.notifyOnConnect(), listeners specified are never called, even though Gamepad.get() with hardcoded indices returns working Gamepad instances.

To Reproduce Steps to reproduce the behavior:

1. Call Gamepad.notifyOnConnect() with valid listeners
2. Connect or disconnect gamepad
3. Listeners are not called

Expected behavior calling Gamepad.notifyOnConnect() causes specified listeners to be called when gamepad is connected or disconnected

Execution Environment:

• Host system: Arch Linux x86_64 kernel 5.10.11
• Target system: Arch Linux x86_64 kernel 5.10.11
• IDE used: Visual Studio Code-OSS
• Kha revision: fd61f8ebbd18b6d9971c0407f6877f6a9d010969
• Kha build output:

  Using Kha (fd61f8eb, M Backends/Kore/khacpp, M Kinc) from /home/sigma0/lib/Kha
  Creating Kha project.
  Exporting asset 1 of 5 (animtest.png).
  Exporting asset 2 of 5 (checkers.png).
  Exporting asset 3 of 5 (p.png).
  Exporting asset 4 of 5 (jbmono.ttf).
  Exporting asset 5 of 5 (pa.png).
  Compiling shader 1 of 8 (painter-colored.frag.glsl).
  Compiling shader 2 of 8 (painter-colored.vert.glsl).
  Compiling shader 3 of 8 (painter-image.frag.glsl).
  Compiling shader 4 of 8 (painter-image.vert.glsl).
  Compiling shader 5 of 8 (painter-text.frag.glsl).
  Compiling shader 6 of 8 (painter-text.vert.glsl).
  Compiling shader 7 of 8 (painter-video.frag.glsl).
  Compiling shader 8 of 8 (painter-video.vert.glsl).
  Using Kinc (0fe88444) from /home/sigma0/lib/Kha/Kinc
  kincfile found.
  Creating Linux project files.
  Compiling...
  Build time: 0m 2s

• Application output (if it runs):

  Starting Kore
  Starting application
  Application stopped

  Additional context I would settle for Gamepad.get() with hardcoded indices, but they do not reconnect when gamepad connection is restored after disconnect

[ghost]

is the total silence for a month because of an obscure target? maybe someone could point me to relevant files? is fixing this at all possible? are there workarounds for this?

i am sorry for pestering with this comment, but i really need this functionality.

[RobDangerous]

This is a hobby project, maintained by only a single person. One month is nothing. The code is here: https://github.com/Kode/Kinc/blob/master/Backends/System/Linux/Sources/kinc/backend/input/gamepad.cpp

[ghost]

Well i got something working, but i'm not sure if solution is at all acceptable.

1. It requires linking against udev from systemd client libraries
2. select() call, used for checking read readiness (i guess in case udev fires off faster than libinput or something), blocks until there is something to read, BUT it works without a select() call, not sure if that's stable though
3. i didn't find where to put udev_unref() call, don't know if that is a problem

should i make a PR or is it better to just continue investigating?

[RobDangerous]

Sounds more complicated than I expected but please always feel free to send pull-requests even if something isn't necessarily ready to be merged yet - that way I can help figuring things out.

[ghost]

Fixed by b4e753f