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Bug 5360

Summary: [PATCH] non-libudev joystick detection doesn't see controllers that were already connected
Product: SDL Reporter: Simon McVittie <smcv>
Component: joystickAssignee: Sam Lantinga <slouken>
Status: RESOLVED FIXED QA Contact: Sam Lantinga <slouken>
Severity: normal    
Priority: P2    
Version: HG 2.1   
Hardware: x86_64   
OS: Linux   
Attachments: joystick: Fix initial detection when not using udev

Description Simon McVittie 2020-11-19 17:27:07 UTC 
This is a follow-up for Bug #5337.

Steps to reproduce:

* Have a USB game controller plugged in
* export SDL_JOYSTICK_DISABLE_UDEV=1
* Run a program that monitors joysticks (like testjoystick)
* Unplug and re-plug the game controller

Expected result:

* Controller is detected as present on startup
* Unplug is detected
* Re-plug is detected

Actual result:

* Controller does not appear to be present initially
* Unplug is not detected either
* Re-plug is detected successfully
Comment 1 Simon McVittie 2020-11-19 17:29:44 UTC 
Created attachment 4529 [details]
joystick: Fix initial detection when not using udev


When watching for hotplug events we can poll the inotify fd, but we
still need to scan /dev/input once per process, otherwise we'll fail
to detect devices that were already connected.
Comment 2 Sam Lantinga 2020-11-24 05:15:08 UTC 
Fixed, thanks!
https://hg.libsdl.org/SDL/rev/9efc5e1acdcc