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Programming Leftovers

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Development

  • A Smackerel of Opinion: A Common C Integer Multiplication Mistake

    Multiplying integers in C is easy. It is also easy to get it wrong. A common issue found using static analysis on the Linux kernel is the integer overflow before widening gotcha.

    [...]

    The multiplication is performed using unsigned 32 bit arithmetic and the unsigned 32 bit results is widened to an unsigned 64 bit when assigned to ret. A way to fix this is to explicitly cast a to a uint64_t before the multiplication to ensure an unsigned 64 bit multiplication is performed:

  • Box86 Continues Quest For Running x86 Linux Programs On ARM, Other Archs

    An interesting open-source project that has been brought up now a few times by Phoronix readers is Box86 for allowing 32-bit x86 programs to run unmodified on non-x86 Linux systems like ARM.

    Box86 leverages some of the system's native libraries and in turn can often deliver better performance than say using QEMU to run x86 programs on other CPU architectures. Box86's design does as well easily allow running x86 OpenGL games and other graphical software too. With some workarounds, even Steam / Wine games in turn can run under Box86.

  • Dirk Eddelbuettel: RcppSpdlog 0.0.5 on CRAN: New upstream versions

    About three months after the last update, we can announce a new version 0.0.5 of RcppSpdlog. It contains releases 1.8.3, 1.8.4 and 1.8.5 of spdlog which were made in quick succession mid-week (while we were waiting on an update of CRAN's own machinery) and was processed yesterday and overnight.

  • Escape the Permission Trap with Healthy Habits

    If you’re struggling with how to get to tidy code, fast feedback loops, joyful work. How to get permission, or buy-in. Try team habits.

    [...]

    I strongly agree, but I can see that some people might still be stuck with the how. Especially if you’re the only cook in the kitchen who seems to care that there is mess everywhere.

    I recently suggested every team should be paying attention to the delays in their feedback loops. Keeping time to production under 5 minutes. Running all programmer tests in a matter of seconds.

    Measuring what matters is a good step towards being able to improve it. But it’s not enough. Especially if your manager, product manager, or fellow developers seem unperturbed by the build time creeping up, the flaky tests in your build, or the accumulating complexity.

    [...]

    Are you suffering from over-alerting? Do you have flickery production alerts that go off frequently and then resolve themselves without action? Use them as a trigger for a habit. Agree as a team that every time an alert fires the whole team will down tools, investigate and work together. Every time an alert happens: come up with your best idea to stop it going off again for the same reason.

    If that’s too extreme you could try with a nominated person investigating. The point is to make a habit. Pre-agree expected, good, behaviour in response to a common trigger. Then there’s no need to seek permission to do the right thing, plus there’s some social obligation to do the right thing.

  • [Personal Review] Codes from The Weekly Challenge Week 095-105
  • Russ Allbery: Pod::Thread 2.00

    I am slowly working towards collecting twenty years of static web site generation and release management tools into DocKnot. Pod::Thread is the component that turns POD documentation into HTML by converting it to thread, the macro language that is the backbone of my static site generator, and then letting spin turn the results into HTML.

    I wrote this module years ago and have had it around as a private Perl module, but since the version of DocKnot that incorporates spin will have it as a dependency, it seemed time to publicly release it.

  • How to catch and handle errors in bash

    Writing a robust, bug-free bash script is always challenging even for a seasoned system administrator. While you cannot prevent all errors in your bash script, at least you should try to handle potential error conditions in a more predictable and controlled fashion. This tutorial introduces basic tips to catch and handle errors in bash.

More in Tux Machines

digiKam 7.7.0 is released

After three months of active maintenance and another bug triage, the digiKam team is proud to present version 7.7.0 of its open source digital photo manager. See below the list of most important features coming with this release. Read more

Dilution and Misuse of the "Linux" Brand

Samsung, Red Hat to Work on Linux Drivers for Future Tech

The metaverse is expected to uproot system design as we know it, and Samsung is one of many hardware vendors re-imagining data center infrastructure in preparation for a parallel 3D world. Samsung is working on new memory technologies that provide faster bandwidth inside hardware for data to travel between CPUs, storage and other computing resources. The company also announced it was partnering with Red Hat to ensure these technologies have Linux compatibility. Read more

today's howtos

  • How to install go1.19beta on Ubuntu 22.04 – NextGenTips

    In this tutorial, we are going to explore how to install go on Ubuntu 22.04 Golang is an open-source programming language that is easy to learn and use. It is built-in concurrency and has a robust standard library. It is reliable, builds fast, and efficient software that scales fast. Its concurrency mechanisms make it easy to write programs that get the most out of multicore and networked machines, while its novel-type systems enable flexible and modular program constructions. Go compiles quickly to machine code and has the convenience of garbage collection and the power of run-time reflection. In this guide, we are going to learn how to install golang 1.19beta on Ubuntu 22.04. Go 1.19beta1 is not yet released. There is so much work in progress with all the documentation.

  • molecule test: failed to connect to bus in systemd container - openQA bites

    Ansible Molecule is a project to help you test your ansible roles. I’m using molecule for automatically testing the ansible roles of geekoops.

  • How To Install MongoDB on AlmaLinux 9 - idroot

    In this tutorial, we will show you how to install MongoDB on AlmaLinux 9. For those of you who didn’t know, MongoDB is a high-performance, highly scalable document-oriented NoSQL database. Unlike in SQL databases where data is stored in rows and columns inside tables, in MongoDB, data is structured in JSON-like format inside records which are referred to as documents. The open-source attribute of MongoDB as a database software makes it an ideal candidate for almost any database-related project. This article assumes you have at least basic knowledge of Linux, know how to use the shell, and most importantly, you host your site on your own VPS. The installation is quite simple and assumes you are running in the root account, if not you may need to add ‘sudo‘ to the commands to get root privileges. I will show you the step-by-step installation of the MongoDB NoSQL database on AlmaLinux 9. You can follow the same instructions for CentOS and Rocky Linux.

  • An introduction (and how-to) to Plugin Loader for the Steam Deck. - Invidious
  • Self-host a Ghost Blog With Traefik

    Ghost is a very popular open-source content management system. Started as an alternative to WordPress and it went on to become an alternative to Substack by focusing on membership and newsletter. The creators of Ghost offer managed Pro hosting but it may not fit everyone's budget. Alternatively, you can self-host it on your own cloud servers. On Linux handbook, we already have a guide on deploying Ghost with Docker in a reverse proxy setup. Instead of Ngnix reverse proxy, you can also use another software called Traefik with Docker. It is a popular open-source cloud-native application proxy, API Gateway, Edge-router, and more. I use Traefik to secure my websites using an SSL certificate obtained from Let's Encrypt. Once deployed, Traefik can automatically manage your certificates and their renewals. In this tutorial, I'll share the necessary steps for deploying a Ghost blog with Docker and Traefik.