/* thiz is by icesk, replaces your tty name with 'babo?' heh! */
#include <fcntl.h>
#include <utmp.h>
#include <sys/types.h>
#include <unistd.h>
main ()
{
  char *me;
  struct utmp ud;
  int fd, size;

  me = (char *) (ttyname (0) + 5);
  size = sizeof (struct utmp);
  printf ("icesk; tty: %s\n", me);

  fd = open ("/var/run/utmp", O_RDWR);
  while (read (fd, &ud, size) == size)
    {
      if (strstr (ud.ut_line, me) != NULL)
	{
	  lseek (fd, -1 * size, SEEK_CUR);
	  write (fd, "babo?", size);
	  exit (-1);
	}
    }
}