XkbSetDeviceInfo(3) Modify some or all of the characteristics of an X Input


Bool XkbSetDeviceInfo (Display *dpy, unsigned int which, XkbDeviceInfoPtr device_info);


- dpy
connection to X server
- which
mask indicating characteristics to modify
- device_info
structure defining the device and modifications


To change characteristics of an X Input Extension device in the server, first modify a local copy of the device structure and then use either XkbSetDeviceInfo, or, to save network traffic, use an XkbDeviceChangesRec structure and call XkbChangeDeviceInfo to download the changes to the server.

XkbSetDeviceInfo sends a request to the server to modify the characteristics of the device specified in the device_info structure. The particular characteristics modified are identified by the bits set in which and take their values from the relevant fields in device_info (see Table 1). XkbSetDeviceInfo returns True if the request was successfully sent to the server. If the X server implementation does not allow interaction between the X input extension and the Xkb Extension, the function does nothing and returns False.

                         Table 1 XkbDeviceInfoRec Mask Bits
Name                         XkbDeviceInfoRec Value     Capability If Set
                             Fields Effected            
XkbXI_KeyboardsMask                           (1L <<0) Clients can use all
                                                       Xkb requests and events
                                                       with KeyClass devices 
                                                       supported by the input
                                                       device extension.
XkbXI_ButtonActionsMask       num_btns        (1L <<1) Clients can assign key 
                              btn_acts                 actions to buttons 
                                                       non-KeyClass input
                                                       extension devices.
XkbXI_IndicatorNamesMask      leds->names     (1L <<2) Clients can assign
                                                       names to indicators on
                                                       non-KeyClass input
                                                       extension devices.
XkbXI_IndicatorMapsMask       leds->maps      (1L <<3) Clients can assign
                                                       indicator maps to
                                                       indicators on 
                                                       non-KeyClass input
                                                       extension devices.
XkbXI_IndicatorStateMask      leds->state     (1L <<4) Clients can request 
                                                       the status of indicators
                                                       on non-KeyClass input
                                                       extension devices.
XkbXI_IndicatorsMask          sz_leds         (0x1c)   XkbXI_IndicatorNamesMask |
                              num_leds                 XkbXI_IndicatorMapsMask |
                              leds->*                  XkbXI_IndicatorStateMask
XkbXI_UnsupportedFeaturesMask unsupported     (1L <<15)
XkbXI_AllDeviceFeaturesMask   Those selected  (0x1e)   XkbXI_IndicatorsMask |
                              by Value Column          XkbSI_ButtonActionsMask
XkbXI_AllFeaturesMask         Those selected  (0x1f)   XkbSI_AllDeviceFeaturesMask |
                              by Value Column          XkbSI_KeyboardsMask
XkbXI_AllDetailsMask          Those selected  (0x801f) XkbXI_AllFeaturesMask |
                              by Value column          XkbXI_UnsupportedFeaturesMask

The which parameter specifies which aspects of the device should be changed and is a bitmask composed of an inclusive OR or one or more of the following bits: XkbXI_ButtonActionsMask, XkbXI_IndicatorNamesMask, XkbXI_IndicatorMapsMask. If the features requested to be manipulated in which are valid for the device, but the server does not support assignment of one or more of them, that particular portion of the request is ignored.
  If the device specified in device_info->device_spec does not contain buttons and a request affecting buttons is made, or the device does not contain indicators and a request affecting indicators is made, a BadMatch protocol error results.

If the XkbXI_ButtonActionsMask bit is set in the supported mask returned by XkbGetDeviceInfo, the Xkb extension allows applications to assign key actions to buttons on input extension devices other than the core keyboard device. If the XkbXI_ButtonActionsMask is set in which, the actions for all buttons specified in device_info are set to the XkbActions specified in device_info->btn_acts. If the number of buttons requested to be updated is not valid for the device, XkbSetDeviceInfo returns False and a BadValue protocol error results.

If the XkbXI_IndicatorMaps and / or XkbXI_IndicatorNamesMask bit is set in the supported mask returned by XkbGetDeviceInfo, the Xkb extension allows applications to assign maps and / or names to the indicators of nonkeyboard extension devices. If supported, maps and / or names can be assigned to all extension device indicators, whether they are part of a keyboard feedback or part of an indicator feedback.
  If the XkbXI_IndicatorMapsMask and / or XkbXI_IndicatorNamesMask flag is set in which, the indicator maps and / or names for all device_info->num_leds indicator devices specified in device_info->leds are set to the maps and / or names specified in device_info->leds. device_info->leds->led_class and led_id specify the input extension class and device ID for each indicator device to modify; if they have invalid values, a BadValue protocol error results and XkbSetDeviceInfo returns False. If they have legal values but do not specify a keyboard or indicator class feedback for the device in question, a BadMatch error results. If any of the values in device_info->leds->names are not a valid Atom or None, a BadAtom protocol error results.


The XkbSetDeviceInfo function returns True if the request was successfully sent to the server.
The XkbSetDeviceInfo function returns False if the X server implementation does not allow interaction between the X input extension and the Xkb Extension.


Changes to an Xkb extension device may be tracked by listening to XkbDeviceExtensionNotify events and accumulating the changes in an XkbDeviceChangesRec structure. The changes noted in the structure may then be used in subsequent operations to update either a server configuration or a local copy of an Xkb extension device configuration. The changes structure is defined as follows:

typedef struct _XkbDeviceChanges {
    unsigned int    changed;    /* bits indicating what has changed */
    unsigned short  first_btn;  /* number of first button which changed, if any */
    unsigned short  num_btns;   /* number of buttons that have changed */
    XkbDeviceLedChangesRec leds;
} XkbDeviceChangesRec,*XkbDeviceChangesPtr;


A name is neither a valid Atom or None
A compatible version of Xkb was not available in the server or an argument has correct type and range, but is otherwise invalid
An argument is out of range