#include <X11/extensions/XInput.h>
Status XChangePointerDevice( Display *display,
XDevice *device,
int xaxis,
int yaxis);
display
Specifies the connection to the X server.
device
Specifies the device to be used as the X pointer.
xaxis
Specifies the axis of the device to be used as the X
pointer x-axis.
yaxis
Specifies the axis of the device to be used as the X
pointer y-axis.
The XChangePointerDevice request causes the server to use the specified device as the X pointer. The device must have been opened by the client via XOpenDevice or a BadDevice error will result. The device must support input class Valuators or a BadMatch error will result. If the implementation does not support use of the specified device as the X pointer, 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 = MappingPointer is sent to all clients. The specified device becomes the X pointer, and the old X pointer becomes accessible through the input extension protocol requests.
XChangePointerDevice 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 input
devices (pointer or keyboard). This error may also occur
if the server implementation does not support using the
specified device as the X pointer.
BadMatch
This error may occur if an XChangePointerDevice request
was made specifying a device that has less than two
valuators, or specifying a valuator index beyond the
range supported by the device.
XChangeKeyboardDevice(3)