When in raw keyboard mode, svgalib receives press and release events from the kernel and keeps track which keys are currently pressed. Calling keyboard_clearstate() sets this information to all keys released. You can use this for cleanup at certain places in your program. In addition svgalib resets the states of all keys when a VC switch occurs because it does not know the current state of keys when it regains control of the console.
svgalib(7), vgagl(7), libvga.config(5), keytest(6), eventtest(6), keyboard_seteventhandler(3), keyboard_init(3), keyboard_init_return_fd(3), keyboard_close(3), keyboard_setdefaulteventhandler(3), keyboard_getstate(3), keyboard_keypressed(3), keyboard_translatekeys(3), keyboard_update(3), keyboard_waitforupdate(3), vga_waitevent(3)
This manual page was edited by Michael Weller <firstname.lastname@example.org>. The exact source of the referenced function as well as of the original documentation is unknown.
It is very likely that both are at least to some extent are due to Harm Hanemaayer <H.Hanemaayer@inter.nl.net>.
Occasionally this might be wrong. I hereby asked to be excused by the original author and will happily accept any additions or corrections to this first version of the svgalib manual.
keyboard_close(3), keyboard_getstate(3), keyboard_init(3), keyboard_keypressed(3), keyboard_seteventhandler(3), keyboard_translatekeys(3), keyboard_update(3), svgalib(7), vga_getkey(3).