#include <stdio.h>
#include <libdevmapper.h>

static int
dm_command(int command,const char *device)
{
  int ret=0;
  struct dm_task *dmt;

  dmt=dm_task_create(command);
  if(!dmt)
    return 0;

  if(!dm_task_set_name(dmt,device))
    goto fail;

  ret=dm_task_run(dmt);

 fail:

  dm_task_destroy(dmt);

  return ret;
}

int
main(int argc,char *argv[])
{
  if(argc<2)
    {
      printf("%s <DM name>\n",argv[0]);
      return 1;
    }

  dm_udev_set_sync_support(0);

  printf("Suspending and resuming %s\n",argv[1]);

  for(;;)
    {
      if(!dm_command(DM_DEVICE_SUSPEND,argv[1]))
	{
	  fprintf(stderr,"Unable to suspend %s\n",argv[1]);
	  break;
	}

      printf("/\r");
      fflush(stdout);

      if(!dm_command(DM_DEVICE_RESUME,argv[1]))
	{
	  fprintf(stderr,"Unable to resume %s\n",argv[1]);
	  break;
	}

      printf("\\\r");
      fflush(stdout);
    }

  return 0;
}