dpro.c

#include "types.h"
#include "stat.h"
#include "user.h"

int main(int argc, char *argv[]) {
    int n;
    int x, z;

    if(argc < 2)
        n = 1; //Default
    else
        n = atoi(argv[1]);
    if (n < 0 || n > 20)
        n = 2;

    x = 0;
    int pid = 0;

    for (int k = 0; k < n; k++)
    {
        pid = fork();
        if ( pid < 0 ) {
            printf(1, "%d failed in fork!\n", getpid());
        } else if (pid > 0) {
            // parent
            printf(1, "Parent %d creating child %d\n",getpid(), pid);
            wait();
        }
        else{
            printf(1, "Child %d created\n",getpid());
            for(z = 0; z < 4000000000; z+=1)
                x = x + 3.14*89.64; //Useless calculation to consume CPU Time
            break;
        }
    }
    exit();
}