// Execute another program received from the command line and time its execution



#include <sys/time.h>

#include <stdio.h>

#include <stdlib.h>

#include <unistd.h>

#include <sys/wait.h>

int main(int argc, char *argv[]) {

    struct timeval start, stop;

    gettimeofday(&start, NULL);

    int f = fork();

    if(-1 == f) {

        perror("Error on fork");

        exit(0);

    } else if (0 == f) {

        if(-1 == execvp(argv[1], argv+1)) {

            perror("Error on execvp");

        }

        exit(0);

    } else {

        wait(0);

        gettimeofday(&stop, NULL);

        printf("Time = %lf millis\n", ((stop.tv_sec - start.tv_sec) * 1000.0 + (stop.tv_usec - start.tv_usec) / 1000.0));

    }

    return 0;

}