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movq
www.uninformativ.de
 (3d ago)

I did a “lecture”/“workshop” about this at work today. 16-bit DOS, real mode. 💾 Pretty cool and the audience (devs and sysadmins) seemed quite interested. 🥳

  • People used the Intel docs to figure out the instruction encodings.
  • Then they wrote a little DOS program that exits with a return code and they used uhex in DOSBox to do that. Yes, we wrote a COM file manually, no Assembler involved. (Many of them had never used DOS before.)
  • DEBUG from FreeDOS was used to single-step through the program, showing what it does.
  • This gets tedious rather quickly, so we switched to SVED from SvarDOS for writing the rest of the program in Assembly language. nasm worked great for us.
  • At the end, we switched to BIOS calls instead of DOS syscalls to demonstrate that the same binary COM file works on another OS. Also a good opportunity to talk about bootloaders a little bit.
  • (I think they even understood the basics of segmentation in the end.)

The 8086 / 16-bit real-mode DOS is a great platform to explain a lot of the fundamentals without having to deal with OS semantics or executable file formats.

Now that was a lot of fun. 🥳 It’s very rare that we do something like this, sadly. I love doing this kind of low-level stuff.

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movq
www.uninformativ.de
 (1w ago)

OpenBSD has the wonderful pledge() and unveil() syscalls:

https://www.youtube.com/watch?v=bXO6nelFt-E

Not only are they super useful (the program itself can drop privileges – like, it can initialize itself, read some files, whatever, and then tell the kernel that it will never do anything like that again; if it does, e.g. by being exploited through a bug, it gets killed by the kernel), but they are also extremely easy to use.

Imagine a server program with a connected socket in file descriptor 0. Before reading any data from the client, the program can do this:

unveil("/var/www/whatever", "r");
unveil(NULL, NULL);
pledge("stdio rpath", NULL);

Done. It’s now limited to reading files from that directory, communicating with the existing socket, stuff like that. But it cannot ever read any other files or exec() into something else.

I can’t wait for the day when we have something like this on Linux. There have been some attempts, but it’s not that easy. And it’s certainly not mainstream, yet.

I need to have a closer look at Linux’s Landlock soon (“soon”), but this is considerably more complicated than pledge()/unveil():

https://landlock.io/

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bender
twtxt.net
 (1w ago)
↳ In-reply-to » @prologic I am finding writing my Notes very therapeutic. Just create a markdown file and commit, push, and it’s live. Whatever comes to mind, whatever I want to keep as relevant. Silly things, more like a dump.

@prologic@twtxt.net yes, I never understood you using micro.blog (and paying for it, nonetheless!). I don’t like it (as a platform), and have an unexplainable dislike for its creator.

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prologic
twtxt.net
 (1w ago)
↳ In-reply-to » @prologic I am finding writing my Notes very therapeutic. Just create a markdown file and commit, push, and it’s live. Whatever comes to mind, whatever I want to keep as relevant. Silly things, more like a dump.

@bender@twtxt.net Maybe one day I’ll take back over my prologic.blog domain from µBlog and redoit with my handy zs tool with some nice CSS 🤣

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kat
yarn.girlonthemoon.xyz
 (3w ago)
↳ In-reply-to » hacking jetbrains mono to include CJK characters from a noto font for stupid purposes (i listen to asian music and my conky sidebar has a lastfm widget so sometimes it shows asian text and jetbrains doesn't render those. so i am frankensteining my way into making it do that)

@lyse@lyse.isobeef.org oh it wouldn’t be very long, maybe that’d make for a fun blog post! i just used the same tool that the nerd font people use to add glyphs, but for a “custom glyph set” i just added. the whole noto font LMAO

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nghialele
nghia.im
 (3w ago)

i saw folks in #lowendtalk are discussing about which password managers are worth using?. should have summary people’s opinion and my own into a blog post, had this idea for a while, the purpose is to tell my people how to be more secure & easier in life.

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prologic
twtxt.net
 (4w ago)
↳ In-reply-to » @kat I don’t like Golang much either, but I am not a programmer. This little site, Go by example might explain a thing or two.

One of the nicest things about Go is the language itself, comparing Go to other popular languages in terms of the complexity to learn to be proficient in:

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kat
yarn.girlonthemoon.xyz
 (6w ago)

i got so emo about my site not being statically generated and instead hand coded but it’s like i don’t even know if i want that because i feel most SSGs are built for blogging and continuous posting and i don’t want that i just want to make my silly pages….

that being said, the one i’d use if i did switch to one would be astro and that one is so flexible i could really do anything with it including keeping my pages as is mostly without doing the blog stuff. idk! something to consider

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movq
www.uninformativ.de
 (7w ago)
↳ In-reply-to » https://alex.party/posts/2025-05-05-the-future-of-web-development-is-ai-get-on-or-get-left-behind/

And on a similar note, cross-post from Mastodon:

What I love about HTML and HTTP is that it can degrade rather gracefully on old browsers.

My website isn’t spectacular but I don’t think it looks horrible, either. And it’s still usable just fine all the way down to WfW 3.11:

It’s not perfect, but it’s usable. And that makes me happy. Almost 30 years of compatibilty.

The biggest sacrifice is probably that I don’t enforce TLS and that HTTP 1.0 has no Host: header, so no vhosts (or rather, everything must come from the default vhost). (Yes, some old browsers send Host:, even though they predate HTTP 1.1. Netscape does, but not IBM WebExplorer, for example.)

(On the other hand, it might completely suck on modern mobile devices. Dunno, I barely use those. 🤪)

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andros
twtxt.andros.dev
 (7w ago)

Nobody want to be a shitty programmer. The question is: Do you do anything not to not be one?
Reading blogs or social media and watching YouTube videos is fun. After them, your code may be a little better, of course. But you need a lot. You need to study! Read good books and study the code of other programmers, for example. Maybe work with a new language, architectures and paradigms. You need break the routine.

If you know Object-oriented programming, you learn functional programming.
If you know Model-View-Controller, you learn Model-View-ViewModel.
If you don’t know anything about architectures, you learn Clean Architecture, Hexagonal Architecture, etc.
If you know Python, you learn Ruby or Go.
If you know Clojure or Lisp… you don’t need to learn anything else. You are already a good programmer. Just kidding. You can learn Elixir or Scala.

Be a good programmer my friend.

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andros
twtxt.andros.dev
 (8w ago)

@bender@twtxt.net Yes, you right. But is premium for more than that.
I use a feature I love a lot: customising different searches with different themes or links.
It’s easy to understand with an example. I have a search with the name “Django”. I set sources: Django documentation, stack overflow, topic “programming” and so on. It’s very quick to find Django solutions.
I also have another way to find my stuff: search my blog and repositories.
I had problems paying for the first mouths, now it’s a working tool for me.

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osnews
feeds.twtxt.net
 (9w ago)

The VTech Socratic method
We’ve had a lot of fun with VTech’s computers in the past on this blog. Usually, they’re relatively spartan computers with limited functionality, but they did make something very interesting in the late 80s. The Socrates is their hybrid video game console/computer design from 1988, and today we’ll start tearing into it. ↫ Leaded Solder web log Now we’re in for the good stuff. A weird educational computer/game console/toy thing from the late ’80s, by VTech. I have a massive soft s … ⌘ Read more

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eapl.me
eapl.me
 (9w ago)
↳ In-reply-to » I guess mentions with .(s) / dot(s) like @eapl.me are valid? 🤔 Or nicks even? 🤔

on timeline the mention looks OK. Is there an issue on Yarn?

It’s an interesting topic. For example on Bsky it’s natural to allow domains https://bsky.social/about/blog/4-28-2023-domain-handle-tutorial

Although TwiXter only allows (letters A-Z, numbers 0-9 and of underscores)
https://help.x.com/en/managing-your-account/x-username-rules

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