Searches the hosts database that is referenced by the TCPIP$HOST
    logical name for a host record with the specified name or alias.
    If the host record is not found, this function may also invoke
    the BIND resolver to query the appropriate name server for the
    information.
    The $QIO equivalent is the IO$_ACPCONTROL function with the
    INETACP_FUNC$C_GETHOSTBYNAME subfunction code.
    Format
      #include  <netdb.h>
      struct hostent *gethostbyname  ( char *name );