C Programming Tutorials

C Programming Tutorials And Articles
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At times certain tasks need more time to execute and when multiple such tasks are desired then blocking on a single task is not a good practice. To Understand, Think of a program that provides some service but this service takes time to execute. Now, if you want this service again and again then...
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Continuing the previous discussion that we did on Unix Threads (Basics) , today we will discuss the concept of 'Thread Synchronization'. Going through a quick recap, we now know that threads are used to make calls to functions non-blocking (asynchronous). One important point that we did not discuss...
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The phenomenon of stuffing excessive data which is beyond the capacity of the allocated memory is known as buffer overflow. In Simple words we can say that for lets say 'n' bytes of memory, if we try to store any number of values which is greater than 'n', then the values beyond the nth value will...
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In a language like 'C', the programmer has almost complete control over memory operations but this brings in a problem that many of you might have faced : Memory errors. Although GDB can be used in many areas of these kind of problems but there are sometimes when programmer doesn't want to put too...
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This article assumes that readers are aware of what pointers are and how they are used in 'C'. As a quick overview, A pointer is a special variable which holds the address of a variable of same type. For example : Lets say there is a variable 'int a=10' so,a pointer to variable 'a' can be...
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We all have been using Functions since we stepped into programming. Numerous times we have called a function with some arguments to it. We all know that the basic declaration of a function is : <return-type><function-name>(<comma seperated list of arguments>); For example : int func(int...
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In this article, I'll present some interesting 'C' problems for which I will not provide the answer. If you are not bale to solve any problem, then just leave a comment here so that everybody is benefited when the problem is discussed. Problems 1) Will the program execute without any problem?...
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The motivation behind writing this article came from the fact that there are still many books/tutorials/softwares etc where I have seen 'void main' being used instead of 'int main'. Still most of the C/C++ newbies are taught to start practice coding with 'void main'. Even I started practicing C in...
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Suppose a system call was blocked due to some reason (like waiting for a read of some data on terminal) and during this time a signal occurs. Do you know what happens in this scenario? In this article we will discuss the impact of signals on system calls. System calls are different from...
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A lot many times you would have used a Linux command with some arguments to it. Like : cp -r /home/user/Desktop/abc /home/abcrm -rf abcIn the above examples, 'cp' or 'rm' are the name of binaries (written in 'C') while the rest of the stuff is the command line arguments to the respective...
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Environment variables can be thought of as a name value pair that affect the behavior of the processes running on an operating system. For example, to know the value of environmental variable PATH in my system, I do : -laptop ~ $ echo $PATH ...
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The other day I was working on a code where in I was doing some file related operations. I used the function feof() to test whether the end of file has been reached or not. I got into some trouble over the way I used this function in my code, after debugging a bit I found the problem. The problem...
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If you are an experienced C/C++ programmer then you must have definitely observed some weird behaviors of code in certain situations. These weird behaviors can be due to various reasons but most of them are because of stack corruption. For all those who have no idea about what stack corruption is,...
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If you work 3-4 hours daily on coding in C/C++ then there ought to be some programs, logics, tricks, tips etc which you come across daily. Some are new to only you while others are interesting enough to be shared. Here in this article, I am going to share one interesting program and how I went...
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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...
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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...
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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...
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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...
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In this article we will extend our code to print more comprehensive information about a file/directory in a directory. Please Refer Developing Linux Utility like 'ls' in C Developing Linux Utility - Part II Arranging Output in Alphabetical Order Example $ ls -l total 148 ...
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We will understand a very important function 'fstat()'. We will create a working code to describe the capabilities of fstat() but before that lets theoretically Understand what it does. fstat() as the name suggests is used to get the status of the file. By status we mean all the useful...
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