load_joystick_data (3) - Linux Manuals
load_joystick_data: Loads joystick calibration data. Allegro game programming library.
load_joystick_data - Loads joystick calibration data. Allegro game programming library.
int load_joystick_data(const char *filename);
Restores calibration data previously stored by save_joystick_data() or
the setup utility. This sets up all aspects of the joystick code: you
don't even need to call install_joystick() if you are using this
function. Pass a NULL filename to read the data from the currently
selected configuration file.
Returns zero on success: if it fails the joystick state is undefined and
you must reinitialise it from scratch.