Manpages - XChangeKeyboardDevice.3

XChangeKeyboardDevice - change which device is used as the X keyboard

  #include <X11/extensions/XInput.h>

  Status XChangeKeyboardDevice( Display *display,
                                XDevice *device);

  display
         Specifies the connection to the X server.

  device
         Specifies the device to be used as the X keyboard.

    The XChangeKeyboardDevice request causes the server to use the
    specified device as the X keyboard. The device must have been
    previously opened by the requesting client via XOpenDevice or a
    BadDevice error will result. The device must support input
    class Keys, or a BadMatch error will result. If the server
    implementation does not support using the requested device as
    the X keyboard, a BadDevice error will result.

    If the specified device is grabbed by another client,
    AlreadyGrabbed is returned. If the specified device is frozen
    by a grab on another device, GrabFrozen is returned. If the
    request is successful, Success is returned.

    If the request succeeds, a ChangeDeviceNotify event is sent to
    all clients that have selected that event. A MappingNotify
    event with request = MappingKeyboard is sent to all clients.
    The specified device becomes the X keyboard and the old X
    keyboard becomes accessible through the input extension
    protocol requests.

    XChangeKeyboardDevice can generate a BadDevice or a BadMatch
    error.

    BadDevice
           An invalid device was specified. The specified device
           does not exist, has not been opened by this client via
           XOpenInputDevice, or is already one of the core X device
           (pointer or keyboard). This error may also occur if the
           server implementation does not support using the
           specified device as the X keyboard.

    BadMatch
           This error may occur if an XChangeKeyboardDevice request
           was made specifying a device that has no keys.

    XChangePointerDevice(3)