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clone() function is used to create a child process from calling process. Calling process will be the parent process of the child process. clone() function is used to run a particular function in a separate thread other than the calling process. Unlike fork() function where rest of the code after fork() function call will execute […]
C/C++ allows passing the variable number of arguments to its functions through a variable argument list (va_list). C/C++ provides a series of macros/functions va_start, va_arg, va_end to allow passing the variable number of arguments to its functions. In this article, we will discuss how to implement this in C/C++. Step 1. We will prepare a […]
fork() function is used to create a child process. The process who calls this function is called parent process. Once the fork() function is called, it creates an exact copy of the calling process. The syntax of the function is: pid_t fork(void); where pid_t is an unique integer which refers the process id. As we […]
MS-DOS supports user input through some of its commands. One of the command is “CHOICE” command to get user option from the given options. The selected option will be returned. CHOICE is the command which is helpful to display list of options and allows the users to select the option from list of options. Once […]
In MS-DOS, we can write DOS commands into a file and these commands are invoked when we run the file. Usually we can enter our command at DOS prompt. Once we enter the command, Operating System will execute the command and display the results on DOS console window. How do we enter multiple commands at […]
FTP is the File Transfer Protocol used to transfer files over internet. Using FTP, we can download or upload the files. Windows Operating System provides ftp commands to connect, download or upload data from/to FTP server. Here are some of the important things you need to remember when working with FTP. Before downloading or uploading […]
Standard C Library provides tons of functions which are very useful and saves a lot of our development time. Through this article we are going to discuss gets() & puts() library functions. Before we start, I would like to mention one important note here which is related to gets() function. gets() function is not recommended […]
When we define a variable in C, have you ever noticed the variable has a scope? Every variable you define in C, has a scope defined; you are not allowed to access the variable beyond it’s scope. That means, the variable will be visible only within the defined scope. Through this article we are going […]
Converting one type of data to another type is the key thing when we deal with data using programming languages. C language supports this data conversion, and provides functions to ease our programming in C. Through this article we are going to discuss about atoi and itoa data conversion functions. atoi function This function is […]
Lists are popular, commonly used, and very useful data structures; directly or indirectly used in most the Applications. Lists are sequences of structures where data is placed in individual blocks. Each block (we call it, a Node or an Element) contains a data part and an address part which points to another block to form […]