shlibs/blkid/samples/topology.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         blkid_topology tp;
  25
  26         if (argc < 2) {
  27                 fprintf(stderr, "usage: %s <device>  "
  28                                 "-- prints topology details about the device\n",
  29                                 program_invocation_short_name);
  30                 return EXIT_FAILURE;
  31         }
  32
  33         devname = argv[1];
  34         pr = blkid_new_probe_from_filename(devname);
  35         if (!pr)
  36                 err(EXIT_FAILURE, "%s: faild to create a new libblkid probe",
  37                                 devname);
  38         /*
  39          * Binary interface
  40          */
  41         tp = blkid_probe_get_topology(pr);
  42         if (tp) {
  43                 printf("----- binary interface:\n");
  44                 printf("\talignment offset     : %lu\n",
  45                                 blkid_topology_get_alignment_offset(tp));
  46                 printf("\tminimum io size      : %lu\n",
  47                                 blkid_topology_get_minimum_io_size(tp));
  48                 printf("\toptimal io size      : %lu\n",
  49                                 blkid_topology_get_optimal_io_size(tp));
  50                 printf("\tlogical sector size  : %lu\n",
  51                                 blkid_topology_get_logical_sector_size(tp));
  52                 printf("\tphysical sector size : %lu\n",
  53                                 blkid_topology_get_physical_sector_size(tp));
  54         }
  55
  56         /*
  57          * NAME=value interface
  58          */
  59
  60         /* enable topology probing */
  61         blkid_probe_enable_topology(pr, TRUE);
  62
  63         /* disable superblocks probing (enabled by default) */
  64         blkid_probe_enable_superblocks(pr, FALSE);
  65
  66         rc = blkid_do_fullprobe(pr);
  67         if (rc == -1)
  68                 errx(EXIT_FAILURE, "%s: blkid_do_fullprobe() failed", devname);
  69         else if (rc == 1)
  70                 warnx("%s: missing topology information", devname);
  71         else {
  72                 int i, nvals = blkid_probe_numof_values(pr);
  73
  74                 printf("----- NAME=value interface (values: %d):\n", nvals);
  75
  76                 for (i = 0; i < nvals; i++) {
  77                         const char *name, *data;
  78
  79                         blkid_probe_get_value(pr, i, &name, &data, NULL);
  80                         printf("\t%s = %s\n", name, data);
  81                 }
  82         }
  83
  84         blkid_free_probe(pr);
  85         return EXIT_SUCCESS;
  86 }