set_mouse_range (3) - Linux Manuals
set_mouse_range: Sets the area of the screen restricting mouse movement. Allegro game programming library.
NAME
set_mouse_range - Sets the area of the screen restricting mouse movement. Allegro game programming library.SYNOPSIS
#include <allegro.h>
void set_mouse_range(int x1, int y1, int x2, int y2);