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X11R7.4 - man page for xgetdevicemodifiermapping (x11r4 section 3)

XGetDeviceModifierMapping(3)		   X FUNCTIONS		     XGetDeviceModifierMapping(3)

       XGetDeviceModifierMapping,  XSetDeviceModifierMapping  -  query	or change device modifier


       int   XSetDeviceModifierMapping(Display	 *display,   XDevice   *device,   XModifierKeymap

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

       display	   Specifies the connection to the X server.

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

       modmap	   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 per-
       mits 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_keyper-
       mod 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  cer-
       tain 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, XSetDeviceModi-
       fierMapping returns MappingBusy, and none of the modifiers is changed.

       XSetDeviceModifierMapping can generate BadLengthP, BadDevice, BadMatch, BadAlloc, and Bad-
       Value 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 errors.

       The XModifierKeymap structure contains:

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

       BadLength   More than eight keys were specified in the XModifierKeymap structure.

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

       BadDevice   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.

       BadMatch    This error may occur if  an	XGetDeviceModifierMapping  or  XChangeDeviceModi-
		   fierMapping request was made specifying a device that has no keys.

       BadValue    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 alterna-
		   tives can generate this error.

       Programming With Xlib

X Version 11				   libXi 1.2.1		     XGetDeviceModifierMapping(3)

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