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Programming Leftovers

Submitted by Roy Schestowitz on Monday 27th of June 2022 06:20:57 PM Filed under
Development
  • The experience of bringing OpenSSL 3.0 into Red Hat Enterprise Linux and Fedora

    The previous major stable version was OpenSSL 1.1 and there is no 2.0 in the middle. The OpenSSL team decided to make an explicit jump in numbering to highlight that this new version included major structural, and more importantly, application programming interface (API) and application binary interface (ABI) changes compared to previous OpenSSL versions.

    These changes affect applications that use the library in direct ways, sometimes by breaking compilation, and often in subtle ways by changing how the library behaves in some situations.

    Due to these differences, changing from OpenSSL 1.1 to OpenSSL 3.0 is not a simple upgrade.

    In the Linux ecosystem, OpenSSL is generally considered a core OS library. It is linked directly or indirectly by the majority of the packages of any distribution and this means that the distribution needs to be fully rebuilt to make such a transition.

  • Godot Engine - Release candidate: Godot 3.5 RC 5

    The upcoming Godot 3.5 is now considered feature complete, and has received a lot of bugfixes and improvements over the past weeks thanks to all the testers and developers who reported and fixed issues. We are now at the Release Candidate stage, finalizing everything so that we can release 3.5-stable for all users.

    At this stage we need people to test this release (and potential follow-up RCs) on as many codebases as possible, to make sure that we catch non-obvious regressions that might have gone unnoticed until now. If you run into any issue, please make sure to report it on GitHub so that we can know about it and fix it!

    For this RC 5, we decided to include two fairly important Android PRs which had recently been finalized, as they are important to fulfill Google Play requirements for the near future: full Android scoped storage support, and upgrading the buildsystem from NDK r21 to NDK r23. They're fairly big changes to include at RC stage but we think it's really worth having in 3.5, so we'll need your help to test Android export templates in this build and confirm that they work as expected.

  • Rakudo Weekly News: 2022.26 Conference Seasoned

    The first in-person event in a long time happened last week. Some of the videos are already available for viewing, others may still come (overview, /r/rakulang comments).

    [...]

    Finally, Corona is still a thing, as at least one attendee tested positive for Corona after the conference. So please continue to look out for your health!

  • Many modes: a GATs pattern

    As some of you may know, on May 4th Jack Huey opened a PR to stabilize an initial version of generic associated types. The current version is at best an MVP: the compiler support is limited, resulting in unnecessary errors, and the syntax is limited, making code that uses GATs much more verbose than I’d like. Nonetheless, I’m super excited, since GATs unlock a lot of interesting use cases, and we can continue to smooth out the rough edges over time. However, folks on the thread have raised some strong concerns about GAT stabilization, including asking whether GATs are worth including in the language at all. The fear is that they make Rust the language too complex, and that it would be better to just use them as an internal building block for other, more accessible features (like async functions and [return position impl trait in traits][RPITIT]). In response to this concern, a number of people have posted about how they are using GATs. I recently took some time to deep dive into these comments and to write about some of the patterns that I found there, including a pattern I am calling the “many modes” pattern, which comes from the chumsky parser combinator library. I posted about this pattern on the thread, but I thought I would cross-post my write-up here to the blog as well, because I think it’s of general interest.

  • Memory Safety for the World’s Largest Software Project - Prossimo

    The Rust for Linux project aims to bring a new system programming language into the Linux kernel. Rust has a key property that makes it very interesting to consider as the second language in the kernel: it guarantees no undefined behavior takes place (as long as unsafe code is sound), particularly in terms of memory management. This includes no use-after-free issues, no double frees, no data races, etc.

    Prossimo is an Internet Security Research Group (ISRG) project. Its goal is to improve the Internet's security-sensitive software infrastructure by addressing memory safety issues in C and C++ code via the use of memory safe languages. One critical example of such infrastructure is the Linux kernel, used in most servers in the world as well as in billions of devices.

  • Ojeda: Memory Safety for the World’s Largest Software Project

    Miguel Ojeda has posted an update on the Rust-for-Linux project.

»

More in Tux Machines

today's howtos

  • How to Change Comment Color in Vim – Fix Unreadable Blue Color

    Are you annoyed about the comment color in vim? The dark blue color of the comment is often hard to read. In this tutorial, we learn how to change the comment color in Vim. There are few methods we can use to look vim comment very readable.

  • How to Add Repository to Debian

    APT checks the health of all the packages, and dependencies of the package before installing it. APT fetches packages from one or more repositories. A repository (package source) is basically a network server. The term "package" refers to an individual file with a .deb extension that contains either all or part of an application. The normal installation comes with default repositories configured, but these contain only a few packages out of an ocean of free software available. In this tutorial, we learn how to add the package repository to Debian.

  • Making a Video of a Single Window

    I recently wanted to send someone a video of a program doing some interesting things in a single X11 window. Recording the whole desktop is easy (some readers may remember my post on Aeschylus which does just that) but it will include irrelevant (and possibly unwanted) parts of the screen, leading to unnecessarily large files. I couldn't immediately find a tool which did what I wanted on OpenBSD [1] but through a combination of xwininfo, FFmpeg, and hk I was able to put together exactly what I needed in short order. Even better, I was able to easily post-process the video to shrink its file size, speed it up, and contort it to the dimension requirements of various platforms. Here's a video straight out of the little script I put together: [...]

  • Things You Can And Can’t Do

    And it got me thinking about what you can and can’t do — what you do and don’t have control over.

  • allow-new-zones in BIND 9.16 on CentOS 8 Stream under SELinux

    We run these training systems with SELinux enabled (I wouldn’t, but my colleague likes it :-), and that’s the reason I aborted the lab: I couldn’t tell students how to solve the cause other than by disabling SELinux entirely, but there wasn’t enough time for that.

  • Will the IndieWeb Ever Become Mainstream?

    This is an interesting question, thanks for asking it, Jeremy. I do have some history with the IndieWeb, and some opinions, so let’s dive in.

    The short answer to the question is a resounding no, and it all boils down to the fact that the IndieWeb is really complicated to implement, so it will only ever appeal to developers.

  • How to Install CUPS Print Server on Ubuntu 22.04

    If your business has multiple personal computers in the network which need to print, then we need a device called a print server. Print server act intermediate between PC and printers which accept print jobs from PC and send them to respective printers. CUPS is the primary mechanism in the Unix-like operating system for printing and print services. It can allow a computer to act as a Print server. In this tutorial, we learn how to set up CUPS print server on Ubuntu 22.04.

Open Hardware: XON/XOFF and Raspberry Pi Pico

  • From XON/XOFF to Forward Incremental Search

    In the olden days of computing, software flow control with control codes XON and XOFF was a necessary feature that dumb terminals needed to support. When a terminal received more data than it could display, there needed to be a way for the terminal to tell the remote host to pause sending more data. The control code 19 was chosen for this. The control code 17 was chosen to tell the remote host to resume transmission of data.

  • Raspberry Pi Pico Used in Plug and Play System Monitor | Tom's Hardware

    Dmytro Panin is at it again, creating a teeny system monitor for his MacBook from scratch with help from our favorite microcontroller, the Raspberry Pi Pico. This plug-and-play system monitor (opens in new tab) lets him keep a close eye on resource usage without having to close any windows or launch any third-party programs. The device is Pico-powered and plugs right into the MacBook to function. It has a display screen that showcases a custom GUI featuring four bar graphs that update in real-time to show the performance of different components, including the CPU, GPU, memory, and SSD usage. It makes it possible to see how hard your PC is running at a glance.

Security Leftovers

How to Apply Accent Colour in Ubuntu Desktop

A step-by-step tutorial on how to apply accent colour in Ubuntu desktop (GNOME) with tips for Kubuntu and others. Read more

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