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

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       XGetDeviceModifierMapping, XSetDeviceModifierMapping - query or change device modifier

       #include <X11/extensions/XInput.h>

       int XSetDeviceModifierMapping( Display *display,
				      XDevice *device,
				      XModifierKeymap *modmap);

       XModifierKeymap *XGetDeviceModifierMapping( Display *display,
						   XDevice *device);

	      Specifies the connection to the X server.

	      Specifies the device whose modifier mapping is to be
	      queried or modified.

	      Specifies a pointer to the XModifierKeymap structure.

	   The XSetDeviceModifierMapping request specifies the KeyCodes of
	   the keys (if any) that are to be used as modifiers for the
	   specified device. If it succeeds, the X server generates a
	   DeviceMappingNotify event, and XSetDeviceModifierMapping
	   returns MappingSuccess. X permits at most eight modifier keys.
	   If more than eight are specified in the XModifierKeymap
	   structure, a BadLength error results.

	   The modifiermap member of the XModifierKeymap structure
	   contains eight sets of max_keypermod KeyCodes, one for each
	   modifier in the order Shift, Lock, Control, Mod1, Mod2, Mod3,
	   Mod4, and Mod5. Only nonzero KeyCodes have meaning in each set,
	   and zero KeyCodes are ignored. In addition, all of the nonzero
	   KeyCodes must be in the range specified by min_keycode and
	   max_keycode as returned by XListInputDevices, or a BadValue
	   error results. No KeyCode may appear twice in the entire map,
	   or a BadValue error results.

	   An X server can impose restrictions on how modifiers can be
	   changed, for example, if certain keys do not generate up
	   transitions in hardware, if auto-repeat cannot be disabled on
	   certain keys, or if multiple modifier keys are not supported.
	   If some such restriction is violated, the status reply is
	   MappingFailed, and none of the modifiers are changed. If the
	   new KeyCodes specified for a modifier differ from those
	   currently defined and any (current or new) keys for that
	   modifier are in the logically down state,
	   XSetDeviceModifierMapping returns MappingBusy, and none of the
	   modifiers is changed.

	   XSetDeviceModifierMapping can generate BadLength, BadDevice,
	   BadMatch, BadAlloc, and BadValue errors.

	   The XGetDeviceModifierMapping request returns a pointer to a
	   newly created XModifierKeymap structure that contains the keys
	   being used as modifiers. The structure should be freed after
	   use by calling XFreeModifierMapping . If only zero values
	   appear in the set for any modifier, that modifier is disabled.

	   XGetDeviceModifierMapping can generate BadDevice and BadMatch


	   The XModifierKeymap structure contains:

	   typedef struct {
	   int max_keypermod;
	   KeyCode *modifiermap;
	   } XModifierKeymap;

		  More than eight keys were specified in the
		  XModifierKeymap structure.

		  The server failed to allocate the requested resource or
		  server memory.

		  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 XGetDeviceModifierMapping or
		  XChangeDeviceModifierMapping request was made specifying
		  a device that has no keys.

		  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.

	   XSetDeviceKeyMapping(3), XSetDeviceButtonMapping(3)

					    03/09/2013			  XGETDEVICEMODIFIERMA(3)
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