Thread: How to get harddisk serial number without root access Linux, C

I need to get hard disk serial number in normal user mode Linux using C. I've found some ways. However for all those need sudo (root) access. Any suggestions. Thanks

Some findings: (however this should run as root)

Code:

static struct hd_driveid hd;
int fd;

if ((fd = open("/dev/hda", O_RDONLY | O_NONBLOCK)) < 0) {
    printf("ERROR opening /dev/hda\n");
    exit(1);
}

if (!ioctl(fd, HDIO_GET_IDENTITY, &hd)) {
    printf("%.20s\n", hd.serial_no);
} else if (errno == -ENOMSG) {
    printf("No serial number available\n");
} else {
    perror("ERROR: HDIO_GET_IDENTITY");
    exit(1);
}

Thanks a lot, I was looking for same kind of method everywhere. Your solution worked. Thanks again.
However can you explain for what this macro is used for?
#define _BSD_SOURCE

Originally Posted by inckka

Thanks a lot, I was looking for same kind of method everywhere. Your solution worked. Thanks again.
However can you explain for what this macro is used for?
#define _BSD_SOURCE

Feature Test Macros

Originally Posted by algorism

Feature Test Macros

Great. Thank you.