#include <stdio.h>
#include <unistd.h>
#include <math.h>
#include <time.h>
#include <sys/time.h>

void obciaz(int new_nice) {
    nice(new_nice);
    int a;
    for(int i=0; i<1000000000; i++) {
        a = i*i*i*i;
        sin(13.254f);
    }
}

int main(int argc, char **argv) {
    for(int i=1; i<argc; i++) {
        int new_nice = atoi(argv[i]);
        int pid;
        if((pid = fork()) == 0) {
            struct timeval  tv1, tv2;
            gettimeofday(&tv1, NULL);
            obciaz(new_nice);

            gettimeofday(&tv2, NULL);
            printf("Total time for process of nice %d = %f seconds\n", new_nice,
                     (double) (tv2.tv_usec - tv1.tv_usec) / 1000000 +
                              (double) (tv2.tv_sec - tv1.tv_sec));
            exit(0);
        }
    }

    int status;
    for(int i=1; i<argc; i++) {
        wait(&status);
    }
}