typedef void (*__keyboard_handler) (int scancode, int press);
void keyboard_seteventhandler(__keyboard_handler handler);
press is KEY_EVENTRELEASE or KEY_EVENTPRESS if key scancode was released or pressed. Actually the first value is 0 and the second is 1 which are so intuitive s.t. you may use them in your program.
Even you specify an own handler, svgalib will check for <Alt>-F* or <Ctrl>-C for console switches or generation of SIGINT if allowed by keyboard_translatekeys(3).
Calling keyboard_setdefaulteventhandler() reinstates the default handler which maintains the tables used by keyboard_getstate(3) and keyboard_keypressed(3). It is probably a good idea to call keyboard_clearstate(3) after reenabling the default handler.
Here are the supported scancodes. The names of the #defines originate from the US keyboard layout, for other countries, they'll refer to the key in the same physical location, but the keycap will have a different inscription. For the list below, add SCANCODE_ in front of the names to get the right name for your C source. That means, if it lists BACKSLASH below, you shall use SCANCODE_BACKSLASH as symbol in your program. In addition to the names below we also have SCANCODE_0 - SCANCODE_9, SCANCODE_KEYPAD0 - SCANCODE_KEYPAD9, SCANCODE_A - SCANCODE_Z, and SCANCODE_F1 - SCANCODE_F12.
The other key names are ESCAPE, MINUS, EQUAL, BACKSPACE, TAB, BRACKET_LEFT, BRACKET_RIGHT, ENTER, LEFTCONTROL, SEMICOLON, APOSTROPHE, GRAVE, LEFTSHIFT, BACKSLASH, COMMA, PERIOD, SLASH, RIGHTSHIFT, KEYPADMULTIPLY, LEFTALT, SPACE, CAPSLOCK, NUMLOCK, SCROLLLOCK, CURSORUPLEFT, CURSORUP, CURSORUPRIGHT, KEYPADMINUS, CURSORLEFT, CURSORRIGHT, KEYPADPLUS, CURSORDOWNLEFT, CURSORDOWN, CURSORDOWNRIGHT, KEYPADPERIOD, LESS, KEYPADENTER, RIGHTCONTROL, CONTROL, KEYPADDIVIDE, PRINTSCREEN, RIGHTALT, BREAK, BREAK_ALTERNATIVE, HOME, CURSORBLOCKUP, PAGEUP, CURSORBLOCKLEFT, CURSORBLOCKRIGHT, END, CURSORBLOCKDOWN, PAGEDOWN, INSERT, and REMOVE.
svgalib(7), vgagl(7), libvga.config(5), keytest(6), eventtest(6), keyboard_init(3), keyboard_init_return_fd(3), keyboard_close(3), keyboard_getstate(3), keyboard_keypressed(3), keyboard_clearstate(3), keyboard_translatekeys(3), keyboard_update(3), keyboard_waitforupdate(3), vga_waitevent(3)
This manual page was edited by Michael Weller <email@example.com>. 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.