#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <unistd.h>

void childsWork(int ID);

int main(int argc, char **argv) {
    int numOfChildProcesses;

    // Receive an integer numeric command line argument representing the number
    // of child processes to create represented by numOfChildProcesses
    char c;
    if(sscanf(argv[1], "%d %c", &numOfChildProcesses, &c) != 1) {
        printf("Must include integer numeric command line argument");
        return -1;
    }

    // Create a number of child processes equal to numOfChildProcesses
    for(int i = 0; i < numOfChildProcesses; i++) {
        int pid = fork();
        // Determine whether current process is a child process (i.e. PID = 0)
        // If true, execute childs work and exit gracefully
        // If false, continue
        if(pid == 0) {
            childsWork(i);
            exit(0);
        }
    }

    return 0;
}

void childsWork(int ID) {
    // Arbitrarily simulate a variable amount of time that a processes
    // task could take to complete
    srand(time(NULL));
    int n = rand() % 10000000;
    for(int i = 0; i < n; i++);
    printf("Child: %d, PID: %d\n", ID, getpid());
}