Provided by: allegro5-doc_5.0.11-2_all 

NAME
al_is_joystick_installed - Allegro 5 API
SYNOPSIS
#include <allegro5/allegro.h>
bool al_is_joystick_installed(void)
DESCRIPTION
Returns true if al_install_joystick(3alleg5) was called successfully.
al_is_joystick_installed(... Allegro reference manual()