mknod – Tarik Billa

What is the opposite of `mknod`?

May 8, 2023 by Tarik

The correct command is just rm 🙂 A device node created by mknod is just a file that contains a device major and minor number. When you access that file the first time, Linux looks for a driver that advertises that major/minor and loads it. Your driver then handles all I/O with that file. When … Read more

How can I create a device node from the init_module code of a Linux kernel module?

May 2, 2023 by Tarik

To have more control over the device numbers and the device creation, you could do the following steps (instead of register_chrdev()): Call alloc_chrdev_region() to get a major number and a range of minor numbers to work with. Create a device class for your devices with class_create(). For each device, call cdev_init() and cdev_add() to add … Read more