[Solved] CSCI215 Lab1 -Processes

Exercise 1: First process creations

Write two programs that create N_CHILDREN child processes. 1. The first program uses the iterative paradigm (loop)

2. The program uses recursion.

Note: This not a question about process chains: parent creates a child, child creates a grandchild, All created processes must have the same parent.

Exercise 2: First parent/child synchronizations

Repeat exercise 1, but this time use wait primitives so that the initial process waits for:

1. the termination of exactly one child (any child)
2. the termination of the last child it created (that one only) 3. the termination of all its children
3. Exercise 3: Parallel compilation

Write a C program whose arguments are a list of .c source file paths, compiles each of them separately and simultaneously, and then edits the links to produce an executable. This program must create a child process for each file in the list. Each child runs the gcc c program on the file it gets assigned. The parent awaits the termination of all its children if all children processes terminate correctly, the parent performs the link edition by running gcc on all the .o files produced by its children.

Exercise 4: Spy shell

Write a program spy which acts as a wrapper to the shell program.

Once launched, spy reads every command entered by the user (download the skeleton code spyincomplete.c (https://newclasses.nyu.edu/access/content/group/51ce875553814dd5bae58ae3b3c862d0/Worksheets/SkeletonCode/spyincomplete.c) for code that reads user input from the terminal) and executes this command with an exec call.

Use execlp for commands entered with exactly one argument, execvp for all the others.