Example c program using fork

It contains the program code and its activity. Depending on the operating system OS , a process may be made up of multiple threads of execution that execute instructions concurrently. In the computing field, fork is the primary method of process creation on Unix-like operating systems. This function creates a new copy called the child out of the original process, that is called the parent. When the parent process closes or crashes for some reason, it also kills the child process.

Image Source. The operating system is using a unique id for every process to keep track of all processes. If you are running Windows, then I recommend you to use Cygwin. Simply, we can tell that the result is 2 power of n, where n is the number of fork system calls. Inside the first if condition a fork has occurred and it is checking if it is the child process, it then continues to execute its code.

Otherwise if its the parent process it will not go through that if. Then, in the second if , it will only accept the parent process which holds the positive id.

Because when the process that has been forked inside dowork prints Hello World! The problem I am having is that when say for instance the user enters 7, then the display shows: 0 11 2 3 5 8 13 21 child ends. Ellen Ellen 83 1 1 gold badge 2 2 silver badges 7 7 bronze badges. Add a comment. Active Oldest Votes.

Don Neufeld Don Neufeld Ellen really is missing the white space between them. Look carefull t the first printf Aza Aza 11 1 1 bronze badge. Bia Ch Bia Ch 51 2 2 bronze badges. Abhijeet Abhijeet 1. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. Here, there are 8 processes created and therefore the output is printed 8 times. The total number of child processes created is always 2 n Your email address will not be published.

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