non-blocking keyboard input in swift

import Darwin

var orig_termios = termios()

func reset_terminal_mode() {
  tcsetattr(0, TCSANOW, &orig_termios)
}

func set_conio_terminal_mode() {
  tcgetattr(0, &orig_termios)
  var new_termios = orig_termios
  atexit(reset_terminal_mode)
  cfmakeraw(&new_termios)
  tcsetattr(0, TCSANOW, &new_termios)
}

func kbhit() -> Bool {
  var fds = [ pollfd(fd: STDIN_FILENO, events: Int16(POLLIN), revents: 0) ]
  let res = poll(&fds, 1, 0)
  return res > 0
}

func getChar() -> Int {
  var c: UInt8 = 0

  let r = read(0, &c, 1)
  if r < 0 {
    return r
  } else {
    return Int(c)
  }
}

print("Type anything: ", terminator: "")
fflush(stdout)

set_conio_terminal_mode()

var key: Int

while true {
  if kbhit() {
    key = getChar()

    if key == 13 {  // return key
      break
    } else {
      print(String(UnicodeScalar(key)!)+", ", terminator:"")
      fflush(stdout)
    }
  } else {
    print(".", terminator: "")
    fflush(stdout)
    usleep(10)
    print(".", terminator: "")
    fflush(stdout)
    usleep(10)
    print(".", terminator: "")
    fflush(stdout)
    usleep(10)
    print("\u{1B}[3D", terminator: "")
    fflush(stdout)
    usleep(10)
  }
}

print("\r")
reset_terminal_mode()