Method push_event

crates/virtual-machine/src/devices/keyboard.rs:48–57

Push a key event from the host. `scancode` is truncated to 16 bits; `pressed` distinguishes a key-down from a key-up. Drops the event when the queue is full so a stalled guest cannot make the host leak memory.

(&mut self, scancode: u16, pressed: bool)

    /// Push a key event from the host. `scancode` is truncated to 16 bits;
    /// `pressed` distinguishes a key-down from a key-up. Drops the event when the
    /// queue is full so a stalled guest cannot make the host leak memory.
    pub fn push_event(&mut self, scancode: u16, pressed: bool) {
        if self.queue.len() >= KBD_QUEUE_CAP {
            return;
        }
        let mut ev = scancode as u32;
        if pressed {
            ev |= KBD_PRESSED_BIT;
        }
        self.queue.push_back(ev);
    }

    /// Number of events waiting to be read.