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

const int BLOCK_SIZE = 64;

void copyfile (int fd1, int fd2){
    char buffer[BLOCK_SIZE];
    int chars;
    while ((chars = read(fd1, &buffer, BLOCK_SIZE)) > 0){
        write(fd2, &buffer, chars);
    }
}

int main(int argc, char* argv[]) {
  int f, f2;
  struct timeval tv;
  gettimeofday(&tv, NULL);
  int start = tv.tv_usec;
  if (argc != 3){
    printf("Invallid number of arguments\n");
    return 0;
  }
  if ((f = open(argv[1], O_RDONLY)) == -1){
    printf("Invallid path to first file1\n");
    return 0;
  }
  if((f2 = open(argv[2], O_WRONLY | O_CREAT, 0644)) == -1){
    printf("Can't create file\n");
    close(f);
    return 0;
  }
  copyfile(f, f2);
  close(f);
  close(f2);
  gettimeofday(&tv, NULL);
  int end = tv.tv_usec;
  double time = (double)(end - start) / 1000000;
  printf("File copied in %f seconds\n", time);
  return 0;
}