today's howtos and programming bits
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CentOS 8 Package Management with DNF on the Command Line
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AdamW’s Debugging Adventures: “dnf is locked by another application”
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Managing user accounts with Cockpit
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Download Ubuntu 19.10 ISO image to install on VirtualBox VM
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GNU poke: Dealing with alternatives - Unions in Poke
Computing with data whose form is not the most convenient way to be manipulated, like is often the case in unstructured binary data, requires performing a preliminary step that transforms the data into a more convenient representation, usually featuring a higher level of abstraction. This step is known in computer jargon as unmarshalling, when the data is fetch from some storage or transmission media or, more generally, decoding.
Once the computation has been performed, the result should be transformed back to the low-level representation to be stored or transmitted. This is performed in a closing step known as marshalling or, more generally, encoding.
Consider the following C program whose purpose is to read a 32-bit signed integer from a byte-oriented storage media at a given offset, multiply it by two, and store the result at the same offset.
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Android NDK r21 moves to beta
Android announced that NDK r21 is now in beta. Android NDK is a toolset for implementing parts of an app in native code. The release — which is the first long term support release — includes improved defaults for better security and performance.
One of the key features in the release is an update to GNU Make to version 4.2, which provides a number of bug fixes, and enables ‘–output-sync’ to avoid interleaving output with error messages, the team explained. This is enabled by default with ndk-build.
Additionally, GDB, the GNU project debugger, has been updated to version 8.3, which includes fixes for debugging modern Intel CPUs.
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What is the history behind C Programming and Unix?
If you think C programming and Unix are unrelated, then you are making a big mistake. Back in the 1970s and 1980s, if the Unix engineers at Bell Labs had decided to use another programming language instead of C to develop a new version of Unix, then we would be talking about that language today.
The relationship between the two is simple; Unix is the first operating system that is implemented with a high-level C programming language, got its fame and power from Unix. Of course, our statement about C being a high-level programming language is not true in today’s world.
This article is an excerpt from the book Extreme C by Kamran Amini. Kamran teaches you to use C’s power. Apply object-oriented design principles to your procedural C code. You will gain new insight into algorithm design, functions, and structures. You’ll also understand how C works with UNIX, how to implement OO principles in C, and what multiprocessing is.
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Dilution and Misuse of the "Linux" Brand
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