void write_cont_blocks(char *filename)
{
    struct iovec iov[4];
    struct s1 one;
    struct s2 two;
    int three;
    float four;

    int num_written;

    int fd = open(filename, O_RDONLY);
    if (fd == -1) {
        printf("Error opening file: %s\n", filename);
        printf("Error: %s\n", strerror(errno));
        return;
    }

    // Manipulate the buffers to hold info

    // Build buffers to write
    iov[0].iov_base = &one;
    iov[0].iov_len = sizeof(struct s1);

    iov[1].iov_base = &two;
    iov[1].iov_len = sizeof(struct s2);

    iov[2].iov_base = &three;
    iov[2].iov_len = sizeof(three);

    iov[3].iov_base = &four;
    iov[3].iov_len = sizeof(four);

    num_written = writev(fd, iov, 4);
    if (num_written == -1) {
        printf("Error reading file: %s\n", filename);
        printf("Error: %s\n", strerror(errno));
    }

    close(fd);
}