rem: keyboard_write(void *cookie, off_t pos, const void *buf,  size_t *len)
add: keyboard_write(void *cookie, off_t pos, const void *buffer,  size_t *_length)
context: keyboard_write(void *cookie, off_t pos, const void *buf,  size_t *len){	TRACE(("keyboard write()\n"));	*len = 0;	return B_NOT_ALLOWED;}