keyboard_getstate(3) on Linux
The text ddd2e4399eb6, as Debian 7 (Wheezy), Debian 6.0 (Squeeze), Debian 5.0 (Lenny), Debian 4.0 (Etch), Debian 3.1 (Sarge) shipped it. The page shows this text now.
get a pointer to a buffer holding the state of all keys in raw keyboard mode