fidzu : Operating Systems

In macOS, you can apparently create files and directories in the Finder with names that include slashes. If you then go into the terminal and take a look with ls, you'll see that the slashes are actually colons. I don't understand all the nuances, but I know this is a side-effect of the fact that macOS has not one but two path separators: the slash (/) and the colon (:). The two separators are used in different contexts, and the system will translate between them as needed. These two separators reflect the two parent systems of modern macOS: classic Mac OS and the Unix-like NeXTSTEP. When they were joined together, Apple's engineers had to build a file system that was compatible with both the classic Mac's file system (the Mac OS Extended File System, aka HFS+), and with NeXTSTEP's file system (the Unix file system, aka UFS). Among other differences, these systems had different path separators: HFS+ used a colon, while UFS used a slash. ↫ Alex Chan (article from 2021) I had no idea macOS worked this way, but it makes sense considering the platform's dual history. What's interesting is that when Apple moved to APFS almost a decade ago, this duality in path separators remained, most likely for backwards compatibility reasons. In a sense, this is somewhat similar to Windows supporting both backward and forward slashes, with the former being a leftover from DOS, and the latter an addition (to Windows) from the UNIX world. None of that beats Windows when using the Japanese or Korean locale, though. Because Japanese and Korean Windows use different codepages than Windows in the Americas and Western Europe, these versions of Windows render the backslash as the yen sign (¥) and and won (₩) sign respectively. As such, something like the Program Files directory actually renders like C:¥Program Files¥ and C:₩Program Files₩. Similar issues occurred in other Windows locales as well, but the impact of this in Japan and South Korea were so widespread that people just expect it to be that way, even if it's easily fixed today. I can't find if Windows 11 still uses ¥/₩ in Japan/South Korea, since the last references of it I can quickly uncover all point to Windows 10.

21 Jun 2026 9:09pm GMT

Apple's Swift has become the de-facto language for Apple's own developers for a while now, and it seems that with the new operating system releases from the company unveiled during WWDC, Switch is now also being used in the kernel. Naturally I dropped what I was doing and went grepping through the iOS 27 kernelcache. Alas, nothing came of it. All is not lost though: I found the Embedded Swift runtime in macOS 27, sitting in com.apple.kec.pthread of all places. Then I went poking around the root filesystem and it turns out Apple gave the whole effort a name: KernelKit. Let's dissect it. ↫ Josh Maine It's still quite limited at this time, which makes sense - you don't want to be too crazy with the core of the operating system that runs on god knows how many PCs, smartphones, and other devices. It's also entirely contained within a few kexts as embedded runtimes, and the XNU kernel itself remains entirely C and C++.

21 Jun 2026 7:10pm GMT

Every website has a favicon. It's that little icon in your browser tab. Usually you upload it once and then never think about it again. But. A favicon is just an image. An image is just pixels. And pixels are just bytes. So of course I wondered if I could store something inside one. ↫ Tim Wehrle I love it when people do something useless just for fun.

21 Jun 2026 6:58pm GMT

I mean, this is preaching to the choir, but let's go anyway. I liked the UIs of the entire era from 3.0 to 2000, really. I'm mostly using Windows 2000 as an example here because it runs so well in QEMU/KVM and that allows me to easily take screenshots. Some of the following will sound absolutely trivial, but I think it's worth pointing out. ↫ movq.de blog Just a series of observations about how much better graphical user interfaces were back in the '90s and early 2000s. We've lost so many affordances based on both common sense and scientific study, and what we ended up with is a confusing, inconsistent mess. It doesn't really matter where you look - user interface design has deteriorated since the early 2000s, a decline that only accelerated thanks to the arrival of the iPhone, where consistency is a dirty word, and the web, where the advertising people took prominence over the design people. I just want my buttons to look like buttons man.

19 Jun 2026 8:21pm GMT

A fascinating novel approach by researchers at MIT, called Fractal, to study in-depth how processors actually work. A team at MIT's Computer Science and Artificial Intelligence Laboratory (CSAIL) decided to build something different. Fractal, an operating system kernel written from the ground up, treats the hardware itself as the object of study. Its first major use, a deep look at branch predictors - a CPU's way of guessing what code to run next, before it knows for certain, so it doesn't have to waste time waiting to find out - inside Apple's M1 processor, has already turned up findings that prior work missed, including the first evidence that a class of speculative attack known as "Phantom" affects Apple Silicon. "We're using hardware in ways it wasn't designed for," says Joseph Ravichandran, the MIT PhD student in electrical engineering and computer science (EECS) who led the project. "It's not even obvious that this is a possible thing you could do with the hardware. But we found a way to pull all these different primitives off. It's like a microscope. If you've got a hand magnifying glass, you can see a little bit. But if you had an electron microscope, now we're really talking. That's what Fractal is. The electron microscope of operating systems." ↫ Rachel Gordon at MIT News While Fractal is small, its creators also added POSIX system calls, a C library, vim, GCC, a shell, and more. This way, it feels more familiar, and makes it easier for researchers to get started with the tool. Fractal is open source and hosted on GitHub, it has its own website, and there's a detailed research paper with more in-depth information.

19 Jun 2026 12:34pm GMT

Five years after releasing the Amiga 1000, Commodore was about to launch the Amiga 3000, their first real high-end Amiga. With a 68030 processor, on-board SCSI and a slightly updated graphics chipset, all in a sleek desktop case, the Amiga was truly ready for the era of professional 32-bit computing. But Moore's law wasn't the only thing thad had been pressuring Commodore since the release of the Amiga 1000: The desktop metaphor had matured even further, and the competition had been hard at work. IBM had launched OS/2, Windows 3.0 had turned Microsoft's offering from a proof of concept into something actually usable, and new players had entered the scene - among them NeXTStep, with its polished 3D look. It was time to bring AmigaOS, too, into the 1990s. ↫ Carl Svensson It's interesting - there's a lot of focus on the first version of the Amiga operating system and the third one, but you don't hear a lot about AmigaOS 2.x. It turns out this is rather odd, because as Svensson details, this version came with an absolute ton of changes and improvements, from an entirely new widget toolkit to a brand new file system, and so much more. The new widget toolkit and accompanying style guide also ensured that the operating system looked, felt, and behaved consistently. Remember when we cared about that? There's so much more cool features, though, like command history, line editing, universal clipboard support and more just for the CLI, as well as something called Commodities. These were tiny little programs managed from a central location, which didn't even need a GUI to work. Commodities included by default were things like ClickToFront, a focus-follows-mouse option, and more. Oh and of course, BASIC was replaced by ARexx. The list just keeps going, and you should really read Svensson's article.

18 Jun 2026 9:40pm GMT

Oracle is sticking to its promise of more regular Solaris updates with the release of Oracle Solaris 11.4 SRU93. This release, like other SRU releases, is for paying Solaris customers, as the CBE releases for enthusiasts are on a different cadence. With Solaris' focus being on enterprise server environments, it should come as no surprise that most of the changes and improvements are focused on things like enterprise networking and security, such as changes to how policy settings for the Kernel Crypto Framework (KCF) are stored, moving from using RPC over sockets instead of STREAMS, and more. Of course, there's also the long list of updated open source packages. SRU 93.221.2 updates a broad set of platform, runtime, developer, networking, desktop, and open source components. Notable updates include Apache Tomcat to 9.0.116, bash to 5.3 patch 9, BIND to 9.20.18 and 9.20.21, Django 4.2 to 4.2.30, Django 5.2 to 5.2.13, Firefox to 140.8.0esr, Golang to 1.25.8, Node.js 20 to 20.20.2, Node.js 22 to 22.22.2, Node.js 24 to 24.14.1, NSS to 3.119.1, Perl to 5.42, Python 3.11 to 3.11.15, Python 3.13 to 3.13.12, RabbitMQ to 4.2.4, Thunderbird to 140.8.0esr, vim to 9.2.0340, and zlib to 1.3.2. Additional updates include development tools, Python modules, X11 utilities, printing components, libraries, cryptographic packages, networking tools, and desktop-related packages. ↫ Colin Kavanagh at the Oracle Solaris Blog Existing Oracle Solaris customers can update to the new release through pkg update.

18 Jun 2026 8:46am GMT

Yesterday, Google released Android 17 to Pixel devices, so late last night I updated my Pixel 10 Pro with the intent to write a news item about the release today. The reality is that that I totally forgot I even upgraded last night, because Android 17 is about the biggest nothingburger I've ever seen. Virtually all of the new features listed in the upgrade blurb on my phone were "AI" nonsense I don't encounter, so over the course of the day, I didn't really notice anything new about my phone's operating system. The only interesting feature that I think will be particularly useful on tablets and perhaps foldable devices is something called "App Bubbles". Basically, you can turn any application into an overlay that can be minimised into a bubble, which then lives anywhere on your screen. Tap it, and you can maximise the overlay again. This little multitasking bubble can contain multiple applications, effectively making it a dock or taskbar. Neat, but I didn't see much use for it on my phone. The remainder of the new non-"AI" features are hard to spot, at best. I guess the ability to turn one half of a foldable display into a gamepad is neat if you can deal with gaming on glass buttons (I cannot), and the changes to location access (you can now grant it for just one time) and contacts access (it's more fine-grained and temporary now instead of granting access to everything forever) are welcome, but that's about it for user-facing features. Under the hood, the one thing that stands out is that Google is enforcing stricter memory limits for applications, based on how much RAM a device has. The idea is that this should prevent memory leaks from getting out of control and leading to crashes, which is nice, especially for devices with less RAM. Android 17 is available for Pixel devices now, and will probably find its way to non-Pixel devices over the coming months or years. With how little meat there is on Android 17's bones, this might be the first release where Android's update woes don't really matter.

17 Jun 2026 10:44pm GMT

The KDE team released KDE Plasma 6.7 today, and with it comes a long list of improvements, new features, bug fixes, new old themes, and so much more. A new feature that is sure to please those among us who use virtual desktops: you can now have different virtual desktop setups per display. It's been a long-requested feature, so it's great to see it makes its way to the KDE users. I despise virtual desktops, but I'm happy to see something that I assumed was already part of KDE to finally actually become available. Another major feature in KDE Plasma 6.7 is something we've already talked about: the return of the classic Oxygen and Air themes from the KDE 4.x days. These themes have seen extensive work over the past year or so to make them usable on the latest KDE release, which includes tons of bug fixes, visual nips and tucks, and countless additions to the collection of assets required to make a modern KDE theme look complete. This includes a ton of new icons in the old styles, light and dark modes, accent colour support, and much more. There's still work left here, including adding support for QtQuick/Kirigami applications - which brings us to the next major new addition to KDE 6.7 This is also something we've already talked about: Union. I won't repeat what I already explained last time Union came up, but suffice it to say that Union effectively unifies the various different ways KDE applications are themed, allowing theme designers to use relatively standard CSS to create themes that cover every aspect of the KDE user experience. Before Union, theme designers had to create individual, unique themes for a variety of parts of KDE - the Plasma desktop, QtWidgets using QStyle, QtQuick/Kirigami - which was a ton of work, and in the case of QtQuick/Kirigami, wasn't really possible at all. As such, without Union, KDE's theming is essentially broken, and Union fixes that. For now, Union is not enabled by default, and must be installed and enabled separately for testing. Of course, there's a ton of other smaller new features, changes, and bug fixes as well. KDE Plasma 6.7 will find its way to your distribution soon enough.

16 Jun 2026 8:20pm GMT

A week or so ago, Apple announced a bunch of features for the App Store on iOS, including personalised recommendations based on your activity and usage of iOS. It turns out this includes a keylogger (taplogger?) in the App Store, which records every single tap you make, every single letter you enter, and a lot of other information. All of this information is unencrypted and sent to Apple. Now Apple is putting the extensive identifiable analytics they collect in the App Store in action. They record every tap and there's no way to turn it off. They can even calculate your typing speed. ↫ Michael Tsai, quoting Mysk The provided screenshots of the data collected are terrifying, especially because the data is unencrypted, sent to Apple, and fully tied to your user account. Apple clearly wants a slice of that big, juicy advertising pie, and they, too, are discovering that the easiest and best way to serve targeted ads is to collect as much data as they can about you. Of course, this is something the entire internet (but not OSNews!) and several megacorporations are built on by now, but Apple has been incredibly sanctimonious about how it supposedly actually cares about user privacy, making this keylogger yet another case of Apple's hypocrisy on full display. Of course, if you care about privacy, you're entirely free to download your iOS applications from somewhere other than the App Store and install them yours… Oh, wait.

16 Jun 2026 6:41pm GMT

Another story from the good old days from Raymond Chen. During an exchange of war stories, a colleague of mine told one from back in the days when Windows included a processor emulator for x86-32 on systems that natively ran some other processor. (This has happened many times. And no, I don't know which processor this particular story applied to.) ↫ Raymond Chen at The Old New Thing So the core of the story comes down to this: All in all, it took this program 256 kilobytes of code to initialize 64 kilobytes of data. ↫ Raymond Chen at The Old New Thing The people working on Windows were so offended by this, they added code to the processor emulator just to fix this program.

16 Jun 2026 1:53pm GMT

Speaking of FreeBSD, the project released version 15.1 of their operating system today. As it's a point release, it's not full of massive changes, but it still brings the LinuxKPI-based wireless drivers up to Linux 7.0, support for the C23 version of the C has progressed considerably, Unicode has bene updated to version 17.0.0 and CLDR 48, and more.

16 Jun 2026 1:43pm GMT

Expect to see more and more articles like this one, as more and more people discover that FreeBSD's desktop/laptop support keeps improving rapidly. FreeBSD 15 really feels like a breakthrough release. It's always been my favorite operating system for servers, but with the arrival of pkgbase, massive improvements to the LinuxKPI drivers, and the launch of the Laptop Support and Usability Project, it's become my primary desktop, too. ↫ Cullum Smith Since Smith tried FreeBSD 14.0, there's now KDE Plasma 6.x, you can leave legacy X11 behind and use Wayland on FreeBSD now, and support for Intel Wi-Fi chips has greatly expanded. Apparently, battery life has improved as well, which is one of the hardest problems to solve for an operating system, especially with the wide variety of hardware combinations in the x86 world. The rest of Smith's article is a guide to setting up FreeBSD 15 with KDE and Wayland. It's quite detailed with a ton of low-level tuning and fiddling, accompanied by clear and concise explanation of what the changes do, which I really like. Definitely a bookmark for anyone who wants to try out FreeBSD with KDE.

16 Jun 2026 1:24pm GMT

It's been a while since we've had a new operating system project written in Rust, so let's look at Zinnia. The kernel is written in (almost) 100% Rust and attempts to avoid unsafe code where possible. It implements a big range of POSIX APIs in system calls, but also exposes common extensions found in Linux and BSDs, like epoll and timerfd. This allows it to run a somewhat modern desktop using Wayland and X11 sessions. Most drivers are implemented as modules. These are Rust ELF dylibs which get loaded and linked during boot from an initrd, similar to Linux systems. Zinnia can boot from any UEFI based system thanks to the Limine bootloader. ↫ Zinnia OS website At least Weston and Xfce can run on Zinnia, even on real hardware, which is quite an achievement. The project was started in 2024 as a learning endeavour, but quickly grew out of control, as these projects are wont to do. The code's open source.

15 Jun 2026 7:28pm GMT

We're a little deep into June already, but it's only now that Haiku published its monthly progress report for May. There's a bunch of fixes for drag-and-drop behaviour in Tracker, AVX512 support can now be enabled thanks to changes to the kernel's FPU handling, some low-level changes were made for the Rust and Zig compilers, and further improvements were made to the boot process on the Raspberry Pi 5 (although a lot more work is needed on that front). There's still no sixth beta since a few more blockers remain, but don't let that stop you from installing Haiku - it's stable enough as it is, sixth beta or no.

15 Jun 2026 7:21pm GMT

Tribblix, the Illumos distribution focused on giving you a classic UNIX-style experience, has been updated with the release of Milestone 40. This version has some major component updates. Perl in now 5.42 instead of 5.34, and the default Python is now 3.13. The GCC suite is now version 14.2.0, go is version 1.26, Xfce has been updated to version 4.18, node is v22, with v24 added and v20 removed. ↫ Tribblix M40 release notes There's a more detailed changelog, as well as the downloads page to get started. If you're already running Tribblix, you can update in-place, of course.

15 Jun 2026 7:10pm GMT