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Bug 2477

Summary: [PATCH] Joysticks do not work on RHEL6/CentOS6 systems
Product: SDL Reporter: Ashley Whetter <gadget3000>
Component: joystickAssignee: Sam Lantinga <slouken>
Status: RESOLVED FIXED QA Contact: Sam Lantinga <slouken>
Severity: normal    
Priority: P2 CC: gabomdq
Version: HG 2.0   
Hardware: x86_64   
OS: Linux   
Attachments: A patch to fallback to detecting input devices using ID_CLAS

Description Ashley Whetter 2014-04-03 09:00:44 UTC 
Created attachment 1603 [details]
A patch to fallback to detecting input devices using ID_CLAS

RHEL6 and CentOS6 systems still use an old version of udev (147). It wasn't until udev 148 (Yep. 1 version off!) that the input class system changed from "ID_CLASS" to "ID_INPUT_{JOYSTICK,KEYBOARD,MOUSE,etc}" (http://lwn.net/Articles/364728/). Because SDL2 looks for the ID_INPUT_X field this means that it never detects any input devices on RHEL6 systems.

I've attached a patch which fixes the problem. If no input devices are detected with "ID_INPUT_X" then SDL will fallback to looking for the old style "ID_CLASS" udev field instead.
Because of the "big change" between udev versions I doubt it'll ever get upgraded on RHEL6, but because RHEL7 is on the way I don't know if this patch is worth merging. Hopefully it'll help anyone out that's having this problem though.
Comment 1 Sam Lantinga 2014-04-18 03:19:37 UTC 
Looks good to me, thanks!
https://hg.libsdl.org/SDL/rev/a4346af9eec4