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159b03e137
Add support for multi-seat-aware input device hotplugging. This implements the multi-seat scheme explained here: http://www.freedesktop.org/wiki/Software/systemd/multiseat This introduces a new X server switch "-seat" which allows configuration of the seat to enumerate hotplugging devices on. If specified the value of this parameter will also be exported as root window property Xorg_Seat. To properly support input hotplugging devices need to be tagged in udev according to the seat they are on. Untagged devices are assumed to be on the default seat "seat0". If no "-seat" parameter is passed only devices on "seat0" are used. This means that the new scheme is perfectly compatible with existing setups which have no tagged input devices. Note that the -seat switch takes a completely generic identifier, and that it has no effect on non-Linux systems. In fact, on other OSes a completely different identifier scheme for seats could be used but still be exposed with the Xorg_Seat and -seat. I tried to follow the coding style of the surrounding code blocks if there was any one could follow. Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
X Server
The X server accepts requests from client applications to create windows,
which are (normally rectangular) "virtual screens" that the client program
can draw into.
Windows are then composed on the actual screen by the X server
(or by a separate composite manager) as directed by the window manager,
which usually communicates with the user via graphical controls such as buttons
and draggable titlebars and borders.
For a comprehensive overview of X Server and X Window System, consult the
following article:
http://en.wikipedia.org/wiki/X_server
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