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I have been writing many articles on C/Linux explaining concepts, APIs and their usage etc. This time I thought to write on a fundamental concept that every newbie should be well aware of in order to become a good coder, ie 'Good coding practices'. I have 3-4 broader level points to make here. I'll...
By poornaMoksha
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There are certain situations where you may want to limit your process's use of system resources like CPU or may want to put certain limitations on things like number of open file descriptors, maximum memory your process can allocate for its data etc. You may use commands like ulimit, sysconf etc to...
By poornaMoksha
Last Message By poornaMoksha
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The article discusses about all the number formats viz Binary, Decimal, Octal, Hex and BCD (Binary coded decimal) and conversion from Decimal to Binary, Octal and Hex and also the reverse conversion.
Binary
A numbering system based on 2 in which 0 and 1 are the only available digits.
...
By shabbir
Last Message By gatsbycollege
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Recently I have been writing a lot on Linux files and functions related to file I/O. So, extending the discussion further in this article lets discuss two more important Linux functions :
A) access(const char *pathname, int mode)
This function checks whether the calling process can access...
By poornaMoksha
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Type casting is an explicit type conversion requested by the programmer to achieve its objective in the program. During any kind of computations involving various data variables of different data types, leads to the need of typecasting.
Syntax used:
(Data-type-2)<variable/expression of data...
By Trinity
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Continuation of Developing Linux Utility like 'ls' in C series. In the first part we studied a code that was developed to behave like a basic ls utility. Here in this part I have extended the code to give output in alphabetical order.
The code
Here is the code :
...
By poornaMoksha
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Most of the people working on Linux must have used the basic command 'ls'. I use it many times a day. It is a very useful command when it comes to displaying the contents of a directory and their properties. For those few who have still not used 'ls' its high time now, go to its man page, study it...
By poornaMoksha
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A running instance of a program executable is known as a Process. A process when run can do various things like open some files, read/write some data, create some threads/processes, register some functions as callback in various scenarios etc. According to the logic, after the completion of the...
By poornaMoksha
Last Message By Scripting
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Introduction
After a long hiatus, I am back. Months without programming and then finally I got some time on my hands. So I set out to code the Huffman's Data Compression Algorithm. And the result is here! :D
The code is well-commented and I hav given some additional documentation. Also, I...
By rai_gandalf
Last Message By sura
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There are a certain functions in C, which if used in a particular combination may cause problems. These problems are due to the conflicting behaviors of the functions. In this article, we will understand the problem caused by using one such combination of functions scanf() and fgets()/gets().
...
By poornaMoksha
Last Message By poornaMoksha
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Most of the newbie programmers are fascinated by the term 'hacking' or 'cracking'(to be precise). Generally, they see some weirdly written code (that may visually seem like a painting to any new programmer) and start dreaming of the developer who has written the code as god of programming or...
By poornaMoksha
Last Message By poornaMoksha
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After writing Why main() should not have void as return type? article the other day, suddenly one more question came up into my mind about the signature of main() function. In the earlier article I discussed about why 'void main()' should not be used when ANSI C expects the function main() to...
By poornaMoksha
Last Message By wdliming
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This is the fourth post in which I want to share with you some useful observations on error patterns and the ways of fighting them. This time I will touch upon the subject of handling rare and emergency conditions in programs. While examining a number of applications, I came to a conclusion that...
By Karpov2007
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There are times when you write a small or a big code and when you execute it you get a very small and precise output 'Segmentation fault'. In a small piece of code its still easy to debug the reason for this but as the code size grows it becomes very difficult to debug. Here in this article, I am...
By poornaMoksha
Last Message By poornaMoksha
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Introduction
In computer Science and mathematics sorting is any technique that puts elements of a list in a certain numerical or lexicographical order.We will discuss some of the commonly used sorting algorithms which has been implemented in various high level languages like C, C++,...
By techgeek.in
Last Message By sura
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malloc allocates certain amount of memory during program execution and free de-allocates memory previously allocated using a call to functions like malloc, calloc or realloc. Memory leak can occurs when a program allocates memory but does not release it.
Understanding malloc() & free()
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By Trinity
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After writing my previous article Virus Code in Linux - C Code That Changes it's Process Name Run Time, I wondered if a process can change its name then why cannot it change its PID. And what if a process can change both its name and PID after lets say every 1 second? Well it will be a difficult...
By poornaMoksha
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Continuing my previous article Understanding File Handling Functions in C, here in this article let us focus on functions like :
fread() // read a chunk of data from file
fwrite() // Write a chunk of data to file
feof() // Check for end of file indicator
ferror() // Check for error...
By poornaMoksha
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Being a Linux system programmer there are numerous situations when one needs to deal with files kept on disk. Like opening a file, reading a file(one character at a time, one line at a time, the whole file at a time), seeking in a file and then finally closing it. One can use various library...
By poornaMoksha
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The other day I was searching a bit on Linux viruses on Internet. Though there are quite a few now but still cannot be compared with the volumes that we have on windows. Another thing that I found was the permission robustness that Linux file system has as compared to windows OS. So, whiling...
By poornaMoksha
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