title: Major device number 0 in Linux
body: <p>What does it mean by using 0 as major device number? I tried 0; the device doesn't appear in <code>/dev</code> but it is listed in <code>/proc/devices</code>.</p>
  
  <p>I created a char device with <code>register_chrdev</code>: </p>
  
  <p><code>register_chrdev(0, DEVICE_NAME, &amp;char_fops);</code></p>