fileops/disklabel.c

   1 /* compile with:
   2    gcc disklabel.c -o disklabel -Wall -W -Wextra -ansi -pedantic */
   3
   4 #include <fcntl.h>
   5 #include <stdio.h>
   6 #include <stdlib.h>
   7 #include <unistd.h>
   8 #include <sys/disklabel.h>
   9 #include <sys/ioctl.h>
  10
  11 int main(int argc, char *argv[])
  12 {
  13     struct disklabel dklbl;
  14     int fd;
  15
  16     /* check argument count */
  17     if (argc != 2) {
  18         fprintf(stderr, "usage: %s /dev/file\n", argv[0]);
  19         exit(EXIT_FAILURE);
  20     }
  21
  22     /* open device file */
  23     if ((fd = open(argv[1], O_RDONLY)) == -1) {
  24         perror("open");
  25         exit(EXIT_FAILURE);
  26     }
  27
  28     /* get disklabel by calling a disk-specific ioctl */
  29     if (ioctl(fd, DIOCGDINFO, &dklbl) == -1) {
  30         perror("ioctl");
  31         close(fd);
  32         exit(EXIT_FAILURE);
  33     }
  34
  35     printf("Disk: %s\n", dklbl.d_typename);
  36
  37     return EXIT_SUCCESS;
  38 }