XSetDeviceValuators - Man Page

#include <X11/extensions/XInput.h>

XSetDeviceValuators( Display *display,
                     XDevice *device,
                     int *valuators,
                     int first_valuator,
                     int num_valuators);

display
       Specifies the connection to the X server.

device
       Specifies the device whose valuators are to be
       initialized.

valuators
       Specifies a pointer to an array of integer values to be
       used to initialize the device valuators.

first_valuator
       Specifies the first valuator to be set. Valuators are
       numbered beginning with zero.

num_valuators
       Specifies the number of valuators to be set.

The XSetDeviceValuators request sets the current values of the
valuators of an input device. The valuators in the range
first_valuator to (first_valuator + num_valuators) are set to
the specified values. Valuators are numbered beginning with 0.
Not all input devices support initialization of valuator
values. If this request is made to a device that does not
support valuators initialization, a BadMatch error will occur.

If the request succeeds, a status of Success is returned. If
another client has the device grabbed, a status of
AlreadyGrabbed is returned.

XSetDeviceValuators can generate a BadLength, BadDevice,
BadMatch, or BadValue error.

BadDevice
       An invalid device was specified. The specified device
       does not exist or has not been opened by this client via
       XOpenInputDevice.

BadMatch
       This error may occur if an XSetDeviceValuators request
       is made specifying a device that has no valuators and
       reports no axes of motion, or if such a request is made
       specifying a device that does not support valuator
       initialization.

BadValue
       An invalid first_valuator or num_valuators values was
       specified.