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CentOS 7.0 - man page for xsetdevicefocus (centos section 3)

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       XSetDeviceFocus, XGetDeviceFocus - control extension input device focus

       #include <X11/extensions/XInput.h>

       XSetDeviceFocus( Display *display,
			XDevice *device,
			Window focus,
			int revert_to,
			Time time);

       XGetDeviceFocus( Display *display,
			XDevice *device,
			Window *focus_return,
			int *revert_to_return,
			int * time_return);


	      Specifies the connection to the X server.

	      Specifies the device whose focus is to be queried or

	      Specifies the window, PointerRoot, FollowKeyboard,or

	      Returns the focus window, PointerRoot, FollowKeyboard,or

	      Specifies where the input focus reverts to if the window
	      becomes notviewable.You can pass RevertToParent,
	      RevertToPointerRoot, RevertToFollowKeyboard,or

	      Returns the current focus state RevertToParent,
	      RevertToPointerRoot, RevertToFollowKeyboard,or

	      Returns the last_focus_time for the device.

	      Specifies the time.You can pass either a timestamp or

	   The XSetDeviceFocus request changes the focus of the specified
	   device and its last-focus-change time. It has no effect if the
	   specified time is earlier than the current last-focus-change
	   time or is later than the current X server time. Otherwise, the
	   last-focus-change time is set to the specified time CurrentTime
	   is replaced by the current X server time). XSetDeviceFocus
	   causes the X server to generate DeviceFocusIn and
	   DeviceFocusOut events.

	   Depending on the focus argument, the following occurs:
	     * If focus is None , all device events are discarded until a
	       new focus window is set, and the revert_to argument is
	     * If focus is a window, it becomes the device's focus window.
	       If a generated device event would normally be reported to
	       this window or one of its inferiors, the event is reported
	       as usual. Otherwise, the event is reported relative to the
	       focus window.
	     * If focus is PointerRoot, the focus window is dynamically
	       taken to be the root window of whatever screen the pointer
	       is on at each event from the specified device. In this
	       case, the revert_to argument is ignored.
	     * If focus is FollowKeyboard, the focus window is dynamically
	       taken to be the window to which the X keyboard focus is set
	       at each input event.

	   The specified focus window must be viewable at the time
	   XSetDeviceFocus is called, or a BadMatch error results. If the
	   focus window later becomes not viewable, the X server evaluates
	   the revert_to argument to determine the new focus window as
	     * If revert_to is RevertToParent, the focus reverts to the
	       parent (or the closest viewable ancestor), and the new
	       revert_to value is taken to be RevertToNone.
	     * If revert_to is RevertToPointerRoot,
	       RevertToFollowKeyboard, or RevertToNone, the focus reverts
	       to PointerRoot, FollowKeyboard, or None, respectively.

	   When the focus reverts, the X server generates DeviceFocusIn
	   and DeviceFocusOut events, but the last-focus-change time is
	   not affected.

	   Input extension devices are not required to support the ability
	   to be focused. Attempting to set the focus of a device that
	   does not support this request will result in a BadMatch error.
	   Whether or not given device can support this request can be
	   determined by the information returned by XOpenDevice. For
	   those devices that support focus, XOpenDevice will return an
	   XInputClassInfo structure with the input_class field equal to
	   the constant FocusClass (defined in the file XI.h).

	   XSetDeviceFocus can generate BadDevice, BadMatch, BadValue, and
	   BadWindow errors.

	   The XGetDeviceFocus request returns the focus window and the
	   current focus state.

	   Not all input extension devices can be focused. Attempting to
	   query the focus state of a device that can't be focused results
	   in a BadMatch error. A device that can be focused returns
	   information for input Class Focus when an XOpenDevice request
	   is made.

	   XGetDeviceFocus can generate BadDevice, and BadMatch errors.

		  An invalid device was specified. The specified device
		  does not exist or has not been opened by this client via
		  XOpenInputDevice. This error may also occur if the
		  specified device is the X keyboard or X pointer device.

		  Some numeric value falls outside the range of values
		  accepted by the request. Unless a specific range is
		  specified for an argument, the full range defined by the
		  argument's type is accepted. Any argument defined as a
		  set of alternatives can generate this error.

		  A value for a Window argument does not name a defined

		  This error may occur if an XGetDeviceFocus or
		  XSetDeviceFocus request was made specifying a device
		  that the server implementation does not allow to be

					    03/09/2013			       XSETDEVICEFOCUS(3)
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