#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/wait.h>

int main(int argc, char *argv[]) {
    pid_t pid;
    int status, input, i;
    input = atoi(argv[1]);
    i = 0;

    while (i < input) {
    //while(1) {
        pid = fork();
        switch(pid){
            printf("\t child pid = %d\n", getpid());
            case -1:
                printf("case -1");
                fatal("fork failed");
                break;
            case 0:
                /*Child calls exec*/
                execl("sleep.exe", "sleep.exe", (char *)0);
                printf("\tchild pid = %d\n", getpid());
                printf("\tchild ppid = %d\n", getppid());
                break;
            default:
                /*Parent uses wait to suspend execution until child finishes */
                printf("\tparent pid = %d\n", getpid());
                printf("\tparent pid = %d\n", getppid());
                printf("\tchild exited with %d\n", status);
                exit(0);
        }
    waitpid(pid, &status, 0);
    i++;
    }
}

int fatal(char *s) {
    perror(s);
    exit(1);
}