Problem 2

Write a C program on Linux that creates children processes and does the following:

Part I: - The parent process creates 1 child. - The child process itself creates 1 child. This will be the grandchild of the parent. - The parent process reads one number (integer) from the standard input. The parent process sends this number to the child using standard pipes. - The child multiplies the number by 2, prints it as "Child: Input X, Output X*2" and sends the result to the grandchild. - The grandchild multiplies the input number by 2, prints it as "Grandchild: Input X, Output X*2" and sends it back to the child. - The child will send the result back to the parent. - The parent prints the final result. - The parent kills all children processes, and terminates. Part II: Add a sleep(5) parameter to each process operation, so that you can track the behavior as it executes. Open two terminals. In the first terminal, run the tool *htop*. Once in htop, press *t* to sort all processes as a process tree. Resize the window so that you can see the processes properly. In the second terminal, execute your program. Find the program in htop, and take a screenshot of its hierarchy (parent/child/grandchild). Kill the child process amidst execution by pressing *k* in htop, and sending it SIGKILL to immediately terminate it. Take a screenshot of the program execution output. For Problem 2, you may need to use sleep(), kill() and fork() system calls. Refer to the ordinary pipe example in the textbook