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The trust tree | sceen.net
https://www.sceen.net/the-trust-tree
Middot; Comments Off on The trust tree. Middot; Categories: The Hurd. This could be the title of a novel, but no, the subject is really about computers and systems. Despite studies 45 years old. To privileged resources. In practice, this translates to a user installing a file system server in his home directory, starting it on a disk image file, binding it to a file system node he owns, accessing the file system with regular programs, all this without waiting for root to add him to the fuse. The key insi...
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About | sceen.net
https://www.sceen.net/about
My name is Richard Braun. I’m a software engineer with a strong interest in computer science, concurrency, operating systems, and in particular microkernel-based ones. Currently, I work for SBG Systems. As a senior software engineer. Since you got this far, you might as well want to take a look at my resume. I’m also an amateur astronomer. The sceen.net domain mostly hosts personal services. Public services include read-only access to the git repository and NTP. You can reach me at rbraun@sceen.net.
sceen.net
Astronomy | sceen.net
https://www.sceen.net/astronomy
Here is the equipment I currently use for amateur astronomy :. Telescope: Sky-Watcher SkyMax 127/1500. Mount: Sky-Watcher AZ SynScan GoTo. Battery: Tracer Lithium Polymer 12V 14Ah. Eyepieces: TS Optics Super Plössl 6/9/32mm, Tele Vue Nagler Type 6 11mm. Focal modifiers: Tele Vue x2 Barlow lens, Omegon x0.5 focal reducer. Filters: Lumicon #80A/ND25/Deep Sky/UHC, Omegon IR Cut. Software: Stellarium, Open Astro oaCapture, Celestia. Basic modules library for C. Hey, real time! The end of the thundering Hurd.
sceen.net
The X15 operating system | sceen.net
https://www.sceen.net/x15
The X15 operating system. The only way (…) is to encourage a software culture that knows that small is beautiful, that actively resists bloat and complexity: an engineering tradition that puts a high value on simple solutions, that looks for ways to break program systems up into small cooperating pieces. Eric S. Raymond, The Art of UNIX Programming. Source code : https:/ git.sceen.net/rbraun/x15.git/. Documentation: https:/ www.sceen.net/ rbraun/x15/doc/intro.9.html. IRC : #x15 @ Freenode. Security: each...
sceen.net
Basic modules library for C | sceen.net
https://www.sceen.net/basic-modules-library-for-c
Basic modules library for C. Before starting development of a new kernel (see X15. I wrote a few of the modules in userspace in order to make sure they were bug-free and efficient. They also turned out to be pretty useful at work, so they got BSD-licensed. This library is not meant to be linked against. Instead, it acts as a repository of loosely related modules that can be copied and reused individually. Source code : https:/ git.sceen.net/rbraun/librbraun.git/. List of modules :. Hey, real time!
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Let’s Encrypt | sceen.net
https://www.sceen.net/lets-encrypt
Middot; Comments Off on Let’s Encrypt. Middot; Categories: Computing. As a tech geek, I’m quite sensitive to a current trend that aims at pushing the Web towards globally encrypted communications. My main problem with this idea was trust in certificate authorities, and as a result, I ended up being my own CA, which only a few people could trust. Basic modules library for C. Design by picomol. Powered by WordPress.
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The Nagler experience | sceen.net
https://www.sceen.net/the-nagler-experience
Middot; Comments Off on The Nagler experience. Middot; Categories: Astronomy. A while ago, I broke the wide angle eyepiece I mentioned in a previous post. It had dust inside its 4 elements, and I tried to clean it up. As I was a little frustrated by the presence of dust inside the eyepiece itself, I decided that I would only buy very good quality eyepieces from now on. But at the same time, I had grown to appreciate the wide angle. Naturally, I chose to buy a Tele Vue. Basic modules library for C.
sceen.net
Hey, real time ! | sceen.net
https://www.sceen.net/hey-real-time
Hey, real time! Middot; Comments Off on Hey, real time! Middot; Categories: Computing. Among the goals of the X15 operating system is real time. This expression is undoubtedly one of the vaguest buzzwords out there in the computer industry, which means I can’t really say anything about it without first attempting to provide a decent definition. So tell me, how do you prove whether a system is either “hard” or “soft” real time? React as quickly as possible to events. After a few weeks thinking hard about ...
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The end of the thundering Hurd | sceen.net
https://www.sceen.net/the-end-of-the-thundering-hurd
The end of the thundering Hurd. Middot; Comments Off on The end of the thundering Hurd. Middot; Categories: The Hurd. It’s 2016, and the Hurd project is still alive. Barely, as a bunch of only three to five people “regularly” contribute, but it is alive. And it’s making progress. This problem was related to the classic thundering herd problem. Because of the main file system being unable to cope with a restriction on worker threads, we lived with thread storms for a long, long time. Fixes, in particular ...
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GNU Hurd | sceen.net
https://www.sceen.net/gnuhurd
As an occasional GNU/Hurd contributor, here are some of the things I’ve worked on :. You can obtain information about the Hurd on the project Wiki. In addition, this server provides mirrors. Of the GNU Savannah repositories. Basic modules library for C. Hey, real time! The end of the thundering Hurd. Design by picomol. Powered by WordPress.
