Başar Subaşı | iximiuz Labs

Materials by Başar Subaşı

Başar Subaşı has published 8 tutorials and 7 challenges, and prepared 2 playgrounds.

Featured

Writing a (valid) C program without main()

Walk through the C compilation pipeline: preprocessor, compiler, assembler, and linker. Start with a normal hello world, inspect macros and generated assembly, and end by producing a running binary that has no main() function.

#c#gcc#assembly

Tutorial on Programming

Bare-metal programming: Write your first Assembly program

Explore what a computer, CPU architecture, and kernel are, learn the history and family of Assembly ISAs, compare CISC vs RISC, and write your first x86_64 assembly "Hello, World!" program.

#assembly#x86-64#kernel

Tutorial on Linux

Linux Processes: Threads & Concurrency

Explore what a thread actually is in Linux, how threads relate to processes, how the Linux kernel treats both as tasks (task_struct), and how kernel scheduling enables concurrency.

#threads#concurrency#scheduling

Tutorial on Linux

Linux Processes: Understanding Signals

Explore Linux/Unix signals in Go, how signals act as asynchronous notifications, who can send them, default kernel behaviors, sending signals with kill and Go, graceful signal handling with os/signal, and why SIGKILL cannot be trapped.

#golang#signals#ipc

Challenge on Programming

Utilize POSIX Threads for Concurrency

Refactor a slow, single-threaded C file downloader that fetches files sequentially into a multi-threaded program using POSIX Threads (pthreads) to achieve concurrent downloads.

#c#pthreads#threadsEasy

Playground on Linux

Ubuntu eBPF

Experimental playground with out of the box eBPF support through BTF

All materials

This tutorial was created by a community author. Community content is reviewed by the iximiuz Labs team on a best effort basis.

Tutorial on Linux, Containers, Programming

Build a Container from Scratch in Go (Liz Rice GOTO 2018)

by Başar Subaşı

Follow along with Liz Rice's classic GOTO 2018 presentation and build your own container runtime in under 100 lines of Go using Linux namespaces, chroot, and cgroups.

Build a Container from Scratch in Go (Liz Rice GOTO 2018) (cover image)

#go #namespaces #cgroups

This tutorial was created by a community author. Community content is reviewed by the iximiuz Labs team on a best effort basis.

Tutorial on Linux, Containers

Change Your Root: Chroot Basics

by Başar Subaşı

Understand how the chroot system call changes the root directory for a process, learn how dynamic linkers resolve dependencies inside a jail, and see what an isolated process perceives as its filesystem root.

Change Your Root: Chroot Basics (cover image)

#chroot #isolation #filesystem

This tutorial was created by a community author. Community content is reviewed by the iximiuz Labs team on a best effort basis.

Tutorial on Programming, Linux

Using Go for Systems Programming

by Başar Subaşı

Discover how Go functions under the hood as a modern systems programming language. Learn how Go makes system calls directly, resulting in self-contained binaries that have no libc dependencies.

Using Go for Systems Programming (cover image)

#golang #c #syscalls

This tutorial was created by a community author. Community content is reviewed by the iximiuz Labs team on a best effort basis.

Tutorial on Linux, Programming

Linux Processes: Understanding Signals

by Başar Subaşı

Linux Processes: Understanding Signals (cover image)

#golang #signals #ipc

This tutorial was created by a community author. Community content is reviewed by the iximiuz Labs team on a best effort basis.

Tutorial on Linux, Programming

Linux Processes: Threads & Concurrency

by Başar Subaşı

Explore what a thread actually is in Linux, how threads relate to processes, how the Linux kernel treats both as tasks (task_struct), and how kernel scheduling enables concurrency.

Linux Processes: Threads & Concurrency (cover image)

#threads #concurrency #scheduling

This tutorial was created by a community author. Community content is reviewed by the iximiuz Labs team on a best effort basis.

Tutorial on Linux, Programming

Linux Processes: From a Program to a Process

by Başar Subaşı

Explore what a program is, when it actually becomes a process and how the Linux scheduler manages process execution.

Linux Processes: From a Program to a Process (cover image)

#process #scheduling #kernel

See all tutorials by Başar Subaşı →

This challenge was created by a community author. Community content is reviewed by the iximiuz Labs team on a best effort basis.

Challenge on Linux

Run a Glibc-incompatible Binary Using chroot

by Başar Subaşı

Export an Alpine container rootfs using crane, set up a chroot environment, and execute a musl-linked binary that fails to run on the host system.

#chroot #musl #glibc #crane #alpine

This challenge was created by a community author. Community content is reviewed by the iximiuz Labs team on a best effort basis.

Challenge on Linux, Programming

Kill a Stubborn Process with SIGKILL

by Başar Subaşı

A stubborn process is running on the system, kill it :)

#signals #sigkill #golang #kill #process

This challenge was created by a community author. Community content is reviewed by the iximiuz Labs team on a best effort basis.

Challenge on Programming, Linux

Utilize POSIX Threads for Concurrency

by Başar Subaşı

Refactor a slow, single-threaded C file downloader that fetches files sequentially into a multi-threaded program using POSIX Threads (pthreads) to achieve concurrent downloads.

#c #pthreads #threads #concurrency #gcc

This challenge was created by a community author. Community content is reviewed by the iximiuz Labs team on a best effort basis.

Challenge on Programming, Linux

Create a Process from Scratch Using Syscalls

by Başar Subaşı

Write a C program that calls fork() to clone a process and execve() to execute a command, then print and retrieve the child process PID.

#c #process #syscalls #fork #execve

This challenge was created by a community author. Community content is reviewed by the iximiuz Labs team on a best effort basis.

Challenge on Programming, Linux

Write a C Program Without a main() Function

by Başar Subaşı

Produce a valid ELF binary that runs and exits cleanly, but does not define a main() function.

#c #gcc #assembly #linker #elf

This challenge was created by a community author. Community content is reviewed by the iximiuz Labs team on a best effort basis.

Challenge on Programming, Linux

Count Optimized Assembly Instructions

by Başar Subaşı

Compile a small C loop with -O2 -S, inspect the generated assembly, report how many add instructions gcc produced and see how much it has optimized the equasion.

#c #gcc #assembly #optimization

See all challenges by Başar Subaşı →

This playground was created by an iximiuz Labs user and is provided with no warranty.

Playground on Kubernetes, IaC, CI/CD

GitOps Bootstrap

A sandbox where you can experiment with different k8s stacks all you want!

This playground was created by an iximiuz Labs user and is provided with no warranty.

Playground on Linux, Networking, Observability

Ubuntu eBPF

Experimental playground with out of the box eBPF support through BTF

See all playgrounds by Başar Subaşı →