File: key.stp

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systemtap 3.1-2
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#! /usr/bin/env stap

# Useless, but amusing. Based on an idea I saw on a
# dtrace site. (wav files are from emacs).

// KEY_ENTER = 28
probe kernel.function("kbd_event") {
  if ($event_type == 1 && $value) {
    if ($event_code == 28)
      system("play return.wav &> /dev/null")
    else
      system("play click.wav &> /dev/null")
  }
}

probe begin {
  printf("TYPEWRITER ON\n")
}

probe end {
  printf("DONE\n")
}