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Programming & DevOps

Posts about programming, DevOps, Linux server management, and more.

Programming & DevOps

Measuring TTFB (Time to First Byte) for HTTP Requests in Rust

The other day I created a small CLI + library written in Rust, that helps to measure the TTFB (time to first byte) for HTTP GET-Requests in Rust. I had this project on my to-do list for a few months now and finally some time for it. I got inspired Read more…

By Philipp Schuster, 10 months2021-07-12 ago
Programming & DevOps

How to Find Out if a Binary Runs Inside QEMU

In the previous blog post we talked about how to use QEMUs debugcon feature. To do this responsibly, we should only do this if the binary runs in fact inside QEMU. To find this out, one can use the cpuid instruction. It gives us a lot of information about our Read more…

By Philipp Schuster, 10 months2021-07-07 ago
Programming & DevOps

How to Use QEMUs “debugcon”-Feature (and Write to a File)

QEMU is a hypervisor often used for low-level OS/kernel development and testing. Especially when you write your own OS/kernel, things can get really hard and difficult to debug. Furthermore, there are not many debug capabilities in the sense, that you can’t write to files or screen in early phases of Read more…

By Philipp Schuster, 10 months2021-07-07 ago
Programming & DevOps

Rust insight: memory layout of “&str”

TL;DR: At least on x86_64 a &str is two u64 (16 byte) long. The first u64 is a pointer and the second u64 is the length of the string. Due to a small procrastination session, I wanted to know what the layout of &str looks like in memory (on x86_64). Read more…

By Philipp Schuster, 11 months2021-06-30 ago
Programming & DevOps

Rust: setTimeout and setInterval as in Javascript with “tokio” as Runtime

Even though I’m working with Rust for over 2.5 years now, I unfortunately never made a deep dive into the async/await/future-world. But I started using tokio a few days ago and a few questions came up. Tokio is a runtime for executing futures, great! For this, tokio needs some kind Read more…

By Philipp Schuster, 12 months2021-05-17 ago
Programming & DevOps

How-To: Compile EDK2/OVMF From Source on Linux [2021]

EDK2 is a development environment to create firmware implementations that follows the UEFI specification. It is part of tianocore project. which is the reference implemenation for UEFI. Multiple “packages”, which are the sources to build tianocore for different platforms (x86, ARM, QEMU), are located inside the git repository of “EDK2”. Read more…

By Philipp Schuster, 1 year2021-05-11 ago

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Because this blog is a few years old and used to be a more or less personal german blog, old posts are in german. Newer posts are in english.

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