Posts about programming, DevOps, Linux server management, and more.
Update 2021-12-21: I included documentation references. Since Rust nightly 1.59 macros global_asm! and asm! are finally stable! Recently I stumbled upon a Rust project, where *.S– and *.rs-files were side by side in the same Cargo source directory and I was like: “What the heck, I always wanted this!” At Read more…
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…
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…
QEMU is a VMM 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, as you can’t write to files or print to the screen in early boot phases, Read more…
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…
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…