{ int d = __open ("/dev/tty", 0); if (d < 0) return errno;
getlogin_r (name, name_len)     char *name;     size_t name_len;{  char tty_pathname[2 + 2 * NAME_MAX];  char *real_tty_path = tty_pathname;  int result = 0;  struct utmp *ut, line, buffer;  {    int d = __open ("/dev/tty", 0);    if (d < 0)      return errno;    result = __ttyname_r (d, real_tty_path, sizeof (tty_pathname));    (void) __close (d);    if (result != 0)      {	__set_errno (result);	return result;      }  }  real_tty_path += 5;		/* Remove "/dev/".  */  __setutent ();  strncpy (line.ut_line, real_tty_path, sizeof line.ut_line);  if (__getutline_r (&line, &buffer, &ut) < 0)    {      if (errno == ESRCH)	/* The caller expects ENOENT if nothing is found.  */	result = ENOENT;      else	result = errno;    }  else    {      size_t needed = strlen (ut->ut_line) + 1;      if (needed < name_len)	{	  __set_errno (ERANGE);	  result = ERANGE;	}      else	{	  memcpy (name, ut->ut_line, needed);	  result = 0;	}    }  __endutent ();  return result;}