#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <sys/disklabel64.h>
#include <sys/ioctl.h>
int main(void) {
    struct disklabel64 l;
    int fd = open("/dev/vn0s1", O_RDONLY);
    if (fd < 0) { perror("open"); return 1; }
    if (ioctl(fd, DIOCGDINFO64, &l) < 0) { perror("ioctl"); return 1; }
    printf("magic=%08x nparts=%u total=%llu bbase=%llu pbase=%llu pstop=%llu abase=%llu\n",
        l.d_magic, l.d_npartitions,
        (unsigned long long)l.d_total_size, (unsigned long long)l.d_bbase,
        (unsigned long long)l.d_pbase, (unsigned long long)l.d_pstop,
        (unsigned long long)l.d_abase);
    for (int i = 0; i < 6; i++)
        printf("  part[%d] boffset=0x%016llx bsize=0x%llx fstype=%u\n", i,
            (unsigned long long)l.d_partitions[i].p_boffset,
            (unsigned long long)l.d_partitions[i].p_bsize,
            l.d_partitions[i].p_fstype);
    return 0;
}