Challenge on
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.
Challenges
Focused, hands-on DevOps and server-side problems with hints, feedback, and automated solution checks.
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Kill a Stubborn Process with SIGKILL
by Başar Subaşı
A stubborn process is running on the system, kill it :)
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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.
Challenge on ,
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.
Challenge on ,
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.
Challenge on ,
Inspect a Preprocessor Macro Expansion
by Başar Subaşı
Run gcc -E on a small C program and find the exact line where the preprocessor expanded a macro into a printf call.
Challenge on ,
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.