On Android init phase we are running init application that uses its init scripts to start all the code system services. We can add a new daemon easily if we are building a ROM by add an empty folder, adding Android.mk file and C/C++ source file. In this way we can run C/C++ code but […]
Using cgroups you can limit resource usage of processes , for example if you have a web server and you want limit its memory usage to 1GB its very easy to do with cgroups. This is also a basic building block for containers First we need to install some tools (in my example im using […]
A network bridge helps you connect 2 different networks with the same characteristics (Ethernet for example). Its very easy to implement it in linux using some tools Example We run Qemu image with tap interface – we can connect from the qemu image to the linux host but we cant access the entire network (internet) […]
Python is very popular programming language with many job offers. I collected some questions (with answers) from many students interviews. Test yourself: are you ready to work with python? 1. Base and derived classes: Look at the following code:
print 'base show'
print 'derived show'
obj = B()
Is it possible to make obj call the base class show? In other words I […]
While writing Android application or other generic java application you sometimes need to write code in C/C++. Java is a dynamic language with a lot of security checks for example on every array access, every type cast , on function call and return and more. those checks affect performance and if you want to manipulate […]
Python is not a programming language for writing algorithms. It is a dynamic language , secure and high level. If we want to write a complex algorithm we need pointers for efficiency and we will probably use C/C++. Python do have tons of external packages, some of them implemented in C and using a simple […]
Angular provides an easy way to create and work with components , In a single page application(SPA) it is essential to work with multiple views/screens, navigate and communicate between them. Angular provides router service to manage this in a very easy way. We can create a routing module while creating a new application or add […]
Every Linux C/C++ developer is familiar with the message “Segmentation fault (core dumped)” , It can happen by accessing wrong memory address, making a floating point error and more. To find out the problem, you need to enter debug mode or use the core dump Post mortem – core dump While the program is loading […]
Python is a great programming language for data analysis. With tons of packages for data handling it is the best choice for data analysts , algorithm developers and more Lets get started with understanding the relationship between some very popular data packages Numpy is package for multi dimension arrays – very effective implementation Scipy – […]
Building Angular web application is fun and easy. Angular application is build from modules (at least one) and each module has components and services. One great thing about modules is that you can build your own module as unit of reuse and then deploy it to one or more package managers like npm. While building […]