Get HDD infos like serial

hddinfo.c

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <linux/hdreg.h>
#include <unistd.h>


int main(int argc, char *argv[])
{
    static struct hd_driveid hd;
    int fd;

    if (geteuid() >  0) {
        printf("ERROR: Must be root to use\n"); //===>> Must be root to use
        exit(1);
    }

    if ((fd = open(argv[1], O_RDONLY|O_NONBLOCK)) < 0) {
        printf("ERROR: Cannot open device %s\n", argv[1]);
        exit(1);
    }

    if (!ioctl(fd, HDIO_GET_IDENTITY, &hd)) {
        printf("Hard Disk Model: %.40s\n", hd.model);
        printf("  Serial Number: %.20s\n", hd.serial_no);
    } else if (errno == -ENOMSG) {
        printf("No hard disk identification information available\n");
    } else {
        perror("ERROR: HDIO_GET_IDENTITY");
        exit(1);
    }

    exit(0);
}