libblkid/samples/superblocks.c

   1 /*
   2  * Copyright (C) 2009 Karel Zak <kzak@redhat.com>
   3  *
   4  * This file may be redistributed under the terms of the
   5  * GNU Lesser General Public License.
   6  */
   7
   8 #include <stdio.h>
   9 #include <stdlib.h>
  10 #include <sys/types.h>
  11 #include <sys/stat.h>
  12 #include <fcntl.h>
  13 #include <errno.h>
  14
  15 #include <blkid.h>
  16
  17 #include "c.h"
  18
  19 int main(int argc, char *argv[])
  20 {
  21         int rc;
  22         char *devname;
  23         blkid_probe pr;
  24
  25         if (argc < 2) {
  26                 fprintf(stderr, "usage: %s <device>  "
  27                                 "-- prints superblocks details about the device\n",
  28                                 program_invocation_short_name);
  29                 return EXIT_FAILURE;
  30         }
  31
  32         devname = argv[1];
  33         pr = blkid_new_probe_from_filename(devname);
  34         if (!pr)
  35                 err(EXIT_FAILURE, "%s: faild to create a new libblkid probe",
  36                                 devname);
  37
  38         /* enable topology probing */
  39         blkid_probe_enable_superblocks(pr, TRUE);
  40
  41         /* set all flags */
  42         blkid_probe_set_superblocks_flags(pr,
  43                         BLKID_SUBLKS_LABEL | BLKID_SUBLKS_LABELRAW |
  44                         BLKID_SUBLKS_UUID | BLKID_SUBLKS_UUIDRAW |
  45                         BLKID_SUBLKS_TYPE | BLKID_SUBLKS_SECTYPE |
  46                         BLKID_SUBLKS_USAGE | BLKID_SUBLKS_VERSION |
  47                         BLKID_SUBLKS_MAGIC);
  48
  49         rc = blkid_do_safeprobe(pr);
  50         if (rc == -1)
  51                 errx(EXIT_FAILURE, "%s: blkid_do_safeprobe() failed", devname);
  52         else if (rc == 1)
  53                 warnx("%s: cannot gather information about superblocks", devname);
  54         else {
  55                 int i, nvals = blkid_probe_numof_values(pr);
  56
  57                 for (i = 0; i < nvals; i++) {
  58                         const char *name, *data;
  59
  60                         blkid_probe_get_value(pr, i, &name, &data, NULL);
  61                         printf("\t%s = %s\n", name, data);
  62                 }
  63         }
  64
  65         blkid_free_probe(pr);
  66         return EXIT_SUCCESS;
  67 }