php man page for poll_keyboard

poll_keyboard(3alleg4)						  Allegro manual					    poll_keyboard(3alleg4)

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), exs-
       tars(3alleg4)

Allegro 							   version 4.4.2					    poll_keyboard(3alleg4)