Systems Programming – Kernel Crash vs User-space Process Crash
thelinuxchannel A crash in User-space process (say something like segmentation fault) happens just in process virtual memory address space vs a crash in Kernel space (such as Linux Kernel which is…
Linux device drivers
Linux Kernel Tasklets – Big-Picture vs User-Space Threads (pthreads)
Linux Kernel Tasklets and Work queues are somewhat similar to user-space process threads in terms of the functionality and of course not in terms of its operation or its internal…
Kernel customization via make menuconfig – Linux Kernel Compilation (or a Kernel Build)
Here is a detailed YouTube video on Linux Kernel custom compilation and customization via make menuconfig interface
What is a Linux Kernel Module – a Big Picture
Learning Linux Kernel Programming is always fascinating and yet challenging. So generally you may tend to learn Kernel Module programming, since such a module can be dynamically plugged into running…
Linux Kernel Programming – File Operations or FOPs – struct file_operations
Whenever you do Linux Kernel programming, you must've noticed file operations are defined with respect to certain data-structures. Its quite common you may find these in Linux Device Drivers and…
PiPG – Dedicated Raspberry Pi Network Console Port
You can optionally have a dedicated Network Console port for your Raspberry Pi PiPG device. So that you can remotely access the PiPG web UI and configure the same, while…
Linux Kernel Programming | TUN/TAP Driver Source-code | ioctl handlers | #kernel #programming
I was doing a general code walk of Tun/Tap drivers in /drivers/net/tun.c and /drivers/net/tap.c, which is when I stumbled across its ioctl handlers/implementation and then started comparing with generic /net/core/dev_ioctl.c.…
Linux Networking Stack – RFS – Receive Flow Steering
Linux Networking Stack Receive Flow Steering (RFS) aim is to increase data-cache hitrate by steering kernel processing of packets to the CPU where the application thread consuming the packet is…
How to submit your Linux Kernel Patch – Tutorial
If you are a newbie or even an experienced programmer you might have stumbled at kernel newbies page which is heaven for all those who are willing to involve in…
Linux Kernel Module to Drop Packets captured via netfilter hooks
Here is my sample Kernel Module to drop packets (i.e sk_buff instance) captured via netfilter hooks. When you want to drop packets in your custom netfilter hooks make sure you…