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

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       XSetDeviceButtonMapping, XGetDeviceButtonMapping - query or change device button mappings

       #include <X11/extensions/XInput.h>

       int XSetDeviceButtonMapping( Display *display,
				    XDevice *device,
				    unsigned char map[],
				    int nmap);

       int XGetDeviceButtonMapping( Display *display,
				    XDevice *device,
				    unsigned char map_return[],
				    int nmap);

	      Specifies the connection to the X server.

	      Specifies the device whose button mapping is to be
	      queried or changed.

	      Specifies the mapping list.

	      Returns the mapping list.

	      Specifies the number of items in the mapping list.

	   The XSetDeviceButtonMapping request sets the mapping of the
	   specified device. If it succeeds, the X server generates a
	   DeviceMappingNotify event, and XSetDeviceButtonMapping returns
	   MappingSuccess. Element map[i] defines the logical button
	   number for the physical button i+1. The length of the list must
	   be the same as XGetDeviceButtonMapping would return, or a
	   BadValue error results. A zero element disables a button, and
	   elements are not restricted in value by the number of physical
	   buttons. However, no two elements can have the same nonzero
	   value, or a BadValue error results. If any of the buttons to be
	   altered are logically in the down state,
	   XSetDeviceButtonMapping returns MappingBusy, and the mapping is
	   not changed.

	   XSetDeviceButtonMapping can generate BadDevice, BadMatch, and
	   BadValue errors.

	   The XGetDeviceButtonMapping request returns the current mapping
	   of the specified device. Buttons are numbered starting from
	   one.XGetDeviceButtonMapping returns the number of physical
	   buttons actually on the device. The nominal mapping for a
	   device is map[i]=i+1. The nmap argument specifies the length of
	   the array where the device mapping is returned, and only the
	   first nmap elements are returned in map_return.

	   XGetDeviceButtonMapping can generate BadDevice or BadMatch

		  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.

		  This error may occur if an XGetDeviceButtonMapping or
		  XSetDeviceButtonMapping request was made specifying a
		  device that has no buttons.

		  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.

	   XChangeDeviceKeyboardControl(3), XChangeDeviceKeyMapping(3),

					    03/09/2013			  XSETDEVICEBUTTONMAPP(3)
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