#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/resource.h>
#include <sys/time.h>

int main(int argc , char *argv[])
{
    pid_t pid, ppid;
    int status;
    struct rusage rusage;
    unsigned long czas1, czas2;
    long suma, i, procesy;
    printf("Liczba procesów to %s \n", argv[1]);
    procesy = atoi(argv[1]);

/*
    if ((pid = fork()) == -1)
    {
        perror("Blad fork");
        exit(1);
    }
*/
printf ( " proces macierzysty to %d \n", getpid());
ppid = getpid();
for ( int a = 0 ; a < procesy ; a++)
{

    if (fork() == 0)
    {
        pid = getpid();
        printf("Proces potomny: PID = %d\n", pid);
        printf("Proces macierzysty: PID = %d\n", getppid());
        for (i=0; i<400000; i++)
        {
            suma+=i*3+5;
            pid = getpid();
        }

        printf("kod wyjscia to %d\n",a + 8 );

        exit((a + 8));
    }
    else
    {
        //pid = fork();
        //pid = getpid();
        printf("Proces macierzysty: PID = %d\n", pid);
        if (wait3(&status, 0, &rusage) == -1)
        {
            perror("Blad wait3");
            exit(1);
        }
        czas1 = (rusage.ru_utime).tv_sec*1000 + (rusage.ru_utime).tv_usec/1000;
        czas2 = (rusage.ru_stime).tv_sec*1000 + (rusage.ru_stime).tv_usec/1000;
        printf("Czas wykonania potomka\n");
        printf("\t- w trybie u�ytkownika: %ld ms\n", czas1);
        printf("\t- w trybie j�dra: %ld ms\n", czas2);
        printf("Kod wyjścia to %d \n", ( status >> 8));
        //exit(0);
    }
}
    return(0);
}