8dcd71b395
If the event listener is added, then removed again on a lid switch on/off event, the list is set to null. This can trigger two crashes: * when the keyboard is removed first, the call to libinput_device_remove_event_listener() dereferences the null pointer * when the switch is removed first, the call to device_destroy will find a remaining event listener and assert https://bugzilla.redhat.com/show_bug.cgi?id=1440927 Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net> |
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libinput
libinput is a library that handles input devices for display servers and other applications that need to directly deal with input devices.
It provides device detection, device handling, input device event processing and abstraction so minimize the amount of custom input code the user of libinput need to provide the common set of functionality that users expect. Input event processing includes scaling touch coordinates, generating pointer events from touchpads, pointer acceleration, etc.
libinput originates from weston, the Wayland reference compositor.
Architecture
libinput is not used directly by applications, rather it is used by the xf86-input-libinput X.Org driver or wayland compositors. The typical software stack for a system running Wayland is:
@dotfile libinput-stack-wayland.gv
Where the Wayland compositor may be Weston, mutter, KWin, etc. Note that Wayland encourages the use of toolkits, so the Wayland client (your application) does not usually talk directly to the compositor but rather employs a toolkit (e.g. GTK) to do so.
The simplified software stack for a system running X.Org is:
@dotfile libinput-stack-xorg.gv
Again, on a modern system the application does not usually talk directly to the X server using Xlib but rather employs a toolkit to do so.
Source code
The source code of libinput can be found at: http://cgit.freedesktop.org/wayland/libinput
For a list of current and past releases visit: http://www.freedesktop.org/wiki/Software/libinput/
Build instructions: http://wayland.freedesktop.org/libinput/doc/latest/building_libinput.html
Reporting Bugs
Bugs can be filed in the libinput component of Wayland: https://bugs.freedesktop.org/enter_bug.cgi?product=Wayland&component=libinput
Where possible, please provide an evemu recording of the input device and/or the event sequence in question.
See @ref reporting_bugs for more info.
Documentation
Developer API documentation: http://wayland.freedesktop.org/libinput/doc/latest/modules.html
High-level documentation about libinput's features: http://wayland.freedesktop.org/libinput/doc/latest/pages.html
Examples of how to use libinput are the debugging tools in the libinput repository. Developers are encouraged to look at those tools for a real-world (yet simple) example on how to use libinput.
- A commandline debugging tool: https://cgit.freedesktop.org/wayland/libinput/tree/tools/event-debug.c
- A GTK application that draws cursor/touch/tablet positions: https://cgit.freedesktop.org/wayland/libinput/tree/tools/event-gui.c
Build instructions: http://wayland.freedesktop.org/libinput/doc/latest/building_libinput.html
License
libinput is licensed under the MIT license.
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: [...]
See the COPYING file for the full license information.