Linux primary device number 0

Question

What does using 0 as the primary device number mean? I tried 0; the device does not appear in /dev, but it is indicated in /proc/devices.

I created a char device with register_chrdev:

register_chrdev(0, DEVICE_NAME, &char_fops);

+3

Amumu Feb 14 '14 at 9:53

1 answer

Frédéric hamidi · Accepted Answer · 2014-02-14T09:58:03+0000

Passing 0means that you allow register_chrdev () to choose a dynamic number.

In this case, the function will return this number instead 0.