debian man page for mouse_callback

mouse_callback(3alleg4) 					  Allegro manual					   mouse_callback(3alleg4)

NAME
       mouse_callback - User specified mouse callback. Allegro game programming library.

SYNOPSIS
       #include <allegro.h>

       extern void (*mouse_callback)(int flags);

DESCRIPTION
       Called  by  the interrupt handler whenever the mouse moves or one of the buttons changes state. This function must be in locked memory, and
       must execute _very_ quickly! It is passed the event flags that triggered the call,  which  is  a  bitmask  containing  any  of  the  values
       MOUSE_FLAG_MOVE,    MOUSE_FLAG_LEFT_DOWN,    MOUSE_FLAG_LEFT_UP,    MOUSE_FLAG_RIGHT_DOWN,   MOUSE_FLAG_RIGHT_UP,   MOUSE_FLAG_MIDDLE_DOWN,
       MOUSE_FLAG_MIDDLE_UP, and MOUSE_FLAG_MOVE_Z. Note that even if the mouse has more than three buttons, only the first three can  be  trapped
       using a callback.

SEE ALSO
       install_mouse(3alleg4)

Allegro 							   version 4.4.2					   mouse_callback(3alleg4)