NAME

       poll_keyboard - Polls the keyboard. Allegro game programming library.

SYNOPSIS

       #include <allegro.h>

       int poll_keyboard();

DESCRIPTION

       Wherever possible, Allegro will read the keyboard input asynchronously (ie. from inside an
       interrupt handler), but on some platforms that may not be possible, in which case you must
       call this routine at regular intervals to update the keyboard state variables.

       To help you test your keyboard polling code even if you are programming on a platform that
       doesn't require it, after the first time that you call this function Allegro  will  switch
       into  polling mode, so from that point onwards you will have to call this routine in order
       to get any keyboard input at all, regardless of whether the current driver actually  needs
       to be polled or not.

       The  keypressed(), readkey(), and ureadkey() functions call poll_keyboard() automatically,
       so you only need to use this function  when  accessing  the  key[]  array  and  key_shifts
       variable.

RETURN VALUE

       Returns  zero  on  success,  or  a  negative  number  on  failure  (ie. no keyboard driver
       installed).

SEE ALSO

       keyboard_needs_poll(3alleg4),           install_keyboard(3alleg4),           key(3alleg4),
       key_shifts(3alleg4), excamera(3alleg4), exsample(3alleg4), exstars(3alleg4)