title: Linux keyboard delay
body: <p>So I want to build a kernel module (I suppose) which would insert little delay after a keyboard key is pressed (let's say 500ms). I managed to do this in Windows through hooks, but it seems to be different in Linux. Note that I do not wish to use x11 methods, as I want it to also work from the linux console (even if there is no X server running). From what I was able to understand, it would require to build a kernel module and insert it dynamically into the kernel with insmod. I managed to build a key logger which would dump each pressed key to the kernel log, but inserting a delay would require sending the thread that handles the keyboard interrupt handler to sleep, which is a very bad idea, and also to rewrite the entire USB_KBD driver, because the current script calls the request_irq function with the IRQF_SHARED flag set, so I guess the original driver still does its job before executing my function.</p>
  
  <p>I am currently requesting an interrupt handler like this</p>
  
  <pre><code>request_irq (1, (irq_handler_t) irq_handler, IRQF_SHARED, "keyboard_stats_irq", (void *)(irq_handler));
  </code></pre>
  
  <p>Any suggestions on how to handle this (any other way) ?</p>