XSetPointerMapping(), XGetPointerMapping() - manipulate pointer settings
int XSetPointerMapping (Display *display, unsigned char map[],
int nmap)
int XGetPointerMapping (Display *display,
unsigned char map_return[],
int nmap)
The XSetPointerMapping(3) function sets the mapping of the pointer. If it succeeds, the X server generates a MappingNotify event, and XSetPointerMapping(3) returns MappingSuccess. Element map[i] defines the logical button number for the physical button i+1. The length of the list must be the same as XGetPointerMapping(3) would return, or a BadValue error results. A zero element disables a button, and elements are not restricted in value by the number of physical buttons. However, no two elements can have the same nonzero value, or a BadValue error results. If any of the buttons to be altered are logically in the down state, XSetPointerMapping(3) returns MappingBusy, and the mapping is not changed.
XSetPointerMapping(3) can generate a BadValue error.
The XGetPointerMapping(3) function returns the current mapping of the pointer. Pointer buttons are numbered starting from one. XGetPointerMapping(3) returns the number of physical buttons actually on the pointer. The nominal mapping for a pointer is map[i]=i+1. The nmap argument specifies the length of the array where the pointer mapping is returned, and only the first nmap elements are returned in map_return.
Xlib