Programming Leftovers
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Solo BumbleBee makes Linux eBPF programming easier | ZDNet
In 1992, the Berkeley Packet Filter (BPF) was introduced in Unix circles as a new, improved network packet filter. Nice, but not that big a deal. Then, in 2014, it was changed and brought into the Linux kernel as extended BPF (eBPF). Again, that was okay. Just okay. Soon thereafter though, developers started using it to run user-space code inside a virtual machine (VM) on the Linux kernel. And, then it was a huge deal. As Netflix computer performance expert Brendan Gregg said, with eBPF, "superpowers have finally come to Linux."
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Getenv Function Usage in C Programming
In the C programming language, several functions help the user acquire relevant information, such as the process name and id. Similarly, in this article, we will discuss information about the environment list that contains the variable name of the environment and then returns the value in the form of a pointer. If the function getenv() cannot find the environment, it returns NULL, and errno displays the error message.
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Writing a SNES assembler compiler/disassembler - Day 4 | Sylvain Colinet [blogs.perl.org]
It's time to test what we have written so far. If you look at the asar project, there are already some test files and they come with their own test syntax. It's actually pretty neat since it's embedded in the ASM files comments, so you don't need to write specific tests files.
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2022: The year of software supply chain security
If 2020 was the year that we became acutely aware of the consumer goods supply chain (toilet paper, anyone? Anyone?), then 2021 was the year that the software supply chain rose in our collective consciousness. In perhaps the most infamous attack of the year, thousands of customers, including several US government agencies, downloaded compromised SolarWinds updates.
Alas, SolarWinds was not alone. Indeed, the weaknesses in our software supply chain were all too evident with the recent Log4j vulnerability. Log4j is a widely used open source Java logging framework, so the vulnerability has put tens of thousands of applications (ranging from data storage services to online video games) at risk.
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Lessons from Log4j
By now, most readers will likely have seen something about the Log4j vulnerability that has been making life miserable for system administrators since its disclosure on December 9. This bug is relatively easy to exploit, results in remote code execution, and lurks on servers all across the net; it is not hyperbolic to call it one of the worst vulnerabilities that has been disclosed in some years. In a sense, the lessons from Log4j have little new to teach us, but this bug does highlight some problems in the free-software ecosystem in an unambiguous way.
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How to join a string in Java
In Java, strings are used to hold a series of characters and are considered as objects, and to join strings together we need to use a concatenate operator represented by the “+” sign with String.Join function. So in this article, we will discuss some examples to make you understand its functionality.
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How to calculate the square root in Java
If you have a number and if you want to calculate its square root then you can do that by multiplying its factor with itself. In this article, we will teach you how you can calculate the square root of any number in the Java programming language. A Math.sqrt() that is used for this purpose, so detailed syntax and coding for square root calculation will be discussed along with examples.
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How to calculate the absolute value in Java
Absolute value is a non-negative value indicating how distant a number is from 0. Absolute value is always positive because it does not signify the direction. The purpose of the Math.abs() function in Java is to make any negative number positive and has no impact on the number if it is already positive. In this article, we will calculate the absolute value using the Java programming language.
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