#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <ctype.h>
#include <setjmp.h>
#include <errno.h>

#include <sys/ioctl.h>

#include <linux/genhd.h>
#include <linux/hdreg.h>
#include <linux/fs.h>


main() {
        int i, error, fd=open("/dev/sda", O_RDWR);
        printf("The partition table has been altered!\n\n");
        printf("Calling ioctl() to re-read partition table.\n");
        sync();
        sleep(2);
        if (i = ioctl(fd, BLKRRPART)) {
                error = errno;
        } else {
                /* some kernel versions (1.2.x) seem to have trouble
                   rereading the partition table, but if asked to do it
                   twice, the second time works. - biro@yggdrasil.com */
                sync();
                sleep(2);
                if(i = ioctl(fd, BLKRRPART))
                        error = errno;
        }

        close(fd);

        printf("Syncing disks.\n");
        sync();
        sleep(4);               /* for sync() */
        return error;
}