if (read (utmp_data->ut_fd, &utmp_data->ubuf, sizeof (struct utmp)) != sizeof (struct utmp))
while (1)
getutid_r (const struct utmp *id, struct utmp **utmp,	   struct utmp_data *utmp_data){#if (_HAVE_UT_ID - 0) && (_HAVE_UT_TYPE - 0)  /* Test whether ID has any of the legal types.  */  if (id->ut_type != RUN_LVL && id->ut_type != BOOT_TIME      && id->ut_type != OLD_TIME && id->ut_type != NEW_TIME      && id->ut_type != INIT_PROCESS && id->ut_type != LOGIN_PROCESS      && id->ut_type != USER_PROCESS && id->ut_type != DEAD_PROCESS)    /* No, using '<' and '>' for the test is not possible.  */    {      errno = EINVAL;      return -1;    }  /* Open utmp file if not already done.  */  if (utmp_data->ut_fd == -1)    {      setutent_r (utmp_data);      if (utmp_data->ut_fd == -1)	return -1;    }  /* Position file correctly.  */  if (lseek (utmp_data->ut_fd, utmp_data->loc_utmp, SEEK_SET) == -1)    return -1;  while (1)    {      /* Read the next entry.  */      if (read (utmp_data->ut_fd, &utmp_data->ubuf, sizeof (struct utmp))	  != sizeof (struct utmp))	{	  errno = ESRCH;	  return -1;	}      /* Update position pointer.  */      utmp_data->loc_utmp += sizeof (struct utmp);      if ((id->ut_type == RUN_LVL || id->ut_type == BOOT_TIME	   || id->ut_type == OLD_TIME || id->ut_type == NEW_TIME)	  && id->ut_type != utmp_data->ubuf.ut_type)	/* Stop at the next entry with type RUN_LVL, BOOT_TIME,	   OLD_TIME, or NEW_TIME.  */	break;      if ((id->ut_type == INIT_PROCESS || id->ut_type == LOGIN_PROCESS	   || id->ut_type == USER_PROCESS || id->ut_type == DEAD_PROCESS)	  && strncmp (id->ut_id, utmp_data->ubuf.ut_id, sizeof id->ut_id) == 0)	/* Stop at the next entry with the specified ID and with type	   INIT_PROCESS, LOGIN_PROCESS, USER_PROCESS, or DEAD_PROCESS.  */	break;    }  *utmp = &utmp_data->ubuf;  return 0;#else	/* !_HAVE_UT_ID && !_HAVE_UT_TYPE */  errno = ENOSYS;  return -1;#endif}