#include<glib.h>
#include<gio/gio.h>
#include<gudev/gudev.h>
#include<stdio.h>

static const char* const subsystems[] = { "block", 0 };

int main(int argc, char **argv) {
  GFile *root = g_file_new_for_path("idnum.c");
  GFileInfo *info = g_file_query_info(root, G_FILE_ATTRIBUTE_UNIX_DEVICE,
                                     G_FILE_QUERY_INFO_NONE, 0, 0);
  GUdevClient *client = g_udev_client_new(subsystems);
  GUdevDevice *dev;
  int devicenum;
  if(!info) {
    printf("Could not get info.\n");
    return 1;
  }
  devicenum = g_file_info_get_attribute_uint32(info, G_FILE_ATTRIBUTE_UNIX_DEVICE);
  printf("Device id is %d.\n", devicenum);

  dev = g_udev_client_query_by_device_number(client, G_UDEV_DEVICE_TYPE_BLOCK, devicenum);
  if(!dev) {
    printf("Could not get device from num.\n");
    return 1;
  }

  return 0;
}