NAME

       Attributes and Cntls -

   Enumerations
       enum globus_xio_udp_cmd_t { GLOBUS_XIO_UDP_SET_HANDLE, GLOBUS_XIO_UDP_SET_SERVICE,
           GLOBUS_XIO_UDP_GET_SERVICE, GLOBUS_XIO_UDP_SET_PORT, GLOBUS_XIO_UDP_GET_PORT,
           GLOBUS_XIO_UDP_SET_LISTEN_RANGE, GLOBUS_XIO_UDP_GET_LISTEN_RANGE,
           GLOBUS_XIO_UDP_SET_INTERFACE, GLOBUS_XIO_UDP_GET_INTERFACE,
           GLOBUS_XIO_UDP_SET_RESTRICT_PORT, GLOBUS_XIO_UDP_GET_RESTRICT_PORT,
           GLOBUS_XIO_UDP_SET_REUSEADDR, GLOBUS_XIO_UDP_GET_REUSEADDR,
           GLOBUS_XIO_UDP_SET_NO_IPV6, GLOBUS_XIO_UDP_GET_NO_IPV6, GLOBUS_XIO_UDP_GET_HANDLE,
           GLOBUS_XIO_UDP_SET_SNDBUF, GLOBUS_XIO_UDP_GET_SNDBUF, GLOBUS_XIO_UDP_SET_RCVBUF,
           GLOBUS_XIO_UDP_GET_RCVBUF, GLOBUS_XIO_UDP_GET_CONTACT,
           GLOBUS_XIO_UDP_GET_NUMERIC_CONTACT, GLOBUS_XIO_UDP_SET_CONTACT,
           GLOBUS_XIO_UDP_CONNECT, GLOBUS_XIO_UDP_SET_MULTICAST }

   Functions
       globus_result_t globus_xio_attr_cntl (attr, driver, GLOBUS_XIO_UDP_SET_HANDLE,
           globus_xio_system_socket_t handle)
       globus_result_t globus_xio_attr_cntl (attr, driver, GLOBUS_XIO_UDP_SET_SERVICE, const char
           *service_name)
       globus_result_t globus_xio_attr_cntl (attr, driver, GLOBUS_XIO_UDP_GET_SERVICE, char
           **service_name_out)
       globus_result_t globus_xio_attr_cntl (attr, driver, GLOBUS_XIO_UDP_SET_PORT, int
           listener_port)
       globus_result_t globus_xio_attr_cntl (attr, driver, GLOBUS_XIO_UDP_GET_PORT, int
           *listener_port_out)
       globus_result_t globus_xio_attr_cntl (attr, driver, GLOBUS_XIO_UDP_SET_LISTEN_RANGE, int
           listener_min_port, int listener_max_port)
       globus_result_t globus_xio_attr_cntl (attr, driver, GLOBUS_XIO_UDP_GET_LISTEN_RANGE, int
           *listener_min_port_out, int *listener_max_port_out)
       globus_result_t globus_xio_attr_cntl (attr, driver, GLOBUS_XIO_UDP_SET_INTERFACE, const
           char *interface)
       globus_result_t globus_xio_attr_cntl (attr, driver, GLOBUS_XIO_UDP_GET_INTERFACE, char
           **interface_out)
       globus_result_t globus_xio_attr_cntl (attr, driver, GLOBUS_XIO_UDP_SET_RESTRICT_PORT,
           globus_bool_t restrict_port)
       globus_result_t globus_xio_attr_cntl (attr, driver, GLOBUS_XIO_UDP_GET_RESTRICT_PORT,
           globus_bool_t *restrict_port_out)
       globus_result_t globus_xio_attr_cntl (attr, driver, GLOBUS_XIO_UDP_SET_REUSEADDR,
           globus_bool_t resuseaddr)
       globus_result_t globus_xio_attr_cntl (attr, driver, GLOBUS_XIO_UDP_GET_REUSEADDR,
           globus_bool_t *resuseaddr_out)
       globus_result_t globus_xio_attr_cntl (attr, driver, GLOBUS_XIO_UDP_SET_NO_IPV6,
           globus_bool_t no_ipv6)
       globus_result_t globus_xio_attr_cntl (attr, driver, GLOBUS_XIO_UDP_GET_NO_IPV6,
           globus_bool_t *no_ipv6_out)
       globus_result_t globus_xio_attr_cntl (attr, driver, GLOBUS_XIO_UDP_GET_HANDLE,
           globus_xio_system_socket_t *handle_out)
       globus_result_t globus_xio_handle_cntl (handle, driver, GLOBUS_XIO_UDP_GET_HANDLE,
           globus_xio_system_socket_t *handle_out)
       globus_result_t globus_xio_attr_cntl (attr, driver, GLOBUS_XIO_UDP_SET_SNDBUF, int sndbuf)
       globus_result_t globus_xio_handle_cntl (handle, driver, GLOBUS_XIO_UDP_SET_SNDBUF, int
           sndbuf)
       globus_result_t globus_xio_attr_cntl (attr, driver, GLOBUS_XIO_UDP_GET_SNDBUF, int
           *sndbuf_out)
       globus_result_t globus_xio_handle_cntl (handle, driver, GLOBUS_XIO_UDP_GET_SNDBUF, int
           *sndbuf_out)
       globus_result_t globus_xio_attr_cntl (attr, driver, GLOBUS_XIO_UDP_SET_RCVBUF, int rcvbuf)
       globus_result_t globus_xio_handle_cntl (handle, driver, GLOBUS_XIO_UDP_SET_RCVBUF, int
           rcvbuf)
       globus_result_t globus_xio_attr_cntl (attr, driver, GLOBUS_XIO_UDP_GET_RCVBUF, int
           *rcvbuf_out)
       globus_result_t globus_xio_handle_cntl (handle, driver, GLOBUS_XIO_UDP_GET_RCVBUF, int
           *rcvbuf_out)
       globus_result_t globus_xio_handle_cntl (handle, driver, GLOBUS_XIO_UDP_GET_CONTACT, char
           **contact_string_out)
       globus_result_t globus_xio_data_descriptor_cntl (dd, driver, GLOBUS_XIO_UDP_GET_CONTACT,
           char **contact_string_out)
       globus_result_t globus_xio_handle_cntl (handle, driver,
           GLOBUS_XIO_UDP_GET_NUMERIC_CONTACT, char **contact_string_out)
       globus_result_t globus_xio_data_descriptor_cntl (dd, driver,
           GLOBUS_XIO_UDP_GET_NUMERIC_CONTACT, char **contact_string_out)
       globus_result_t globus_xio_data_descriptor_cntl (dd, driver, GLOBUS_XIO_UDP_SET_CONTACT,
           char *contact_string)
       globus_result_t globus_xio_handle_cntl (handle, driver, GLOBUS_XIO_UDP_CONNECT, char
           *contact_string)
       globus_result_t globus_xio_attr_cntl (attr, driver, GLOBUS_XIO_UDP_SET_MULTICAST, char
           *contact_string)

Detailed Description

       UDP driver specific attrs and cntls.

       See Also:
           globus_xio_attr_cntl()

           globus_xio_handle_cntl()

           globus_xio_data_descriptor_cntl()

Enumeration Type Documentation

   enum globus_xio_udp_cmd_t
       doxygen varargs filter stuff UDP driver specific cntls

       Enumerator

       GLOBUS_XIO_UDP_SET_HANDLE
              See usage for: globus_xio_attr_cntl .

       GLOBUS_XIO_UDP_SET_SERVICE
              See usage for: globus_xio_attr_cntl .

       GLOBUS_XIO_UDP_GET_SERVICE
              See usage for: globus_xio_attr_cntl .

       GLOBUS_XIO_UDP_SET_PORT
              See usage for: globus_xio_attr_cntl .

       GLOBUS_XIO_UDP_GET_PORT
              See usage for: globus_xio_attr_cntl .

       GLOBUS_XIO_UDP_SET_LISTEN_RANGE
              See usage for: globus_xio_attr_cntl .

       GLOBUS_XIO_UDP_GET_LISTEN_RANGE
              See usage for: globus_xio_attr_cntl .

       GLOBUS_XIO_UDP_SET_INTERFACE
              See usage for: globus_xio_attr_cntl .

       GLOBUS_XIO_UDP_GET_INTERFACE
              See usage for: globus_xio_attr_cntl .

       GLOBUS_XIO_UDP_SET_RESTRICT_PORT
              See usage for: globus_xio_attr_cntl .

       GLOBUS_XIO_UDP_GET_RESTRICT_PORT
              See usage for: globus_xio_attr_cntl .

       GLOBUS_XIO_UDP_SET_REUSEADDR
              See usage for: globus_xio_attr_cntl .

       GLOBUS_XIO_UDP_GET_REUSEADDR
              See usage for: globus_xio_attr_cntl .

       GLOBUS_XIO_UDP_SET_NO_IPV6
              See usage for: globus_xio_attr_cntl .

       GLOBUS_XIO_UDP_GET_NO_IPV6
              See usage for: globus_xio_attr_cntl .

       GLOBUS_XIO_UDP_GET_HANDLE
              See usage for: globus_xio_attr_cntl , globus_xio_handle_cntl .

       GLOBUS_XIO_UDP_SET_SNDBUF
              See usage for: globus_xio_attr_cntl , globus_xio_handle_cntl .

       GLOBUS_XIO_UDP_GET_SNDBUF
              See usage for: globus_xio_attr_cntl , globus_xio_handle_cntl .

       GLOBUS_XIO_UDP_SET_RCVBUF
              See usage for: globus_xio_attr_cntl , globus_xio_handle_cntl .

       GLOBUS_XIO_UDP_GET_RCVBUF
              See usage for: globus_xio_attr_cntl , globus_xio_handle_cntl .

       GLOBUS_XIO_UDP_GET_CONTACT
              See usage for: globus_xio_handle_cntl , globus_xio_data_descriptor_cntl .

       GLOBUS_XIO_UDP_GET_NUMERIC_CONTACT
              See usage for: globus_xio_handle_cntl , globus_xio_data_descriptor_cntl .

       GLOBUS_XIO_UDP_SET_CONTACT
              See usage for: globus_xio_data_descriptor_cntl .

       GLOBUS_XIO_UDP_CONNECT
              See usage for: globus_xio_handle_cntl .

       GLOBUS_XIO_UDP_SET_MULTICAST
              See usage for: globus_xio_attr_cntl .

Function Documentation

   globus_result_t globus_xio_attr_cntl (attr, driver, GLOBUS_XIO_UDP_SET_HANDLE,
       globus_xio_system_socket_thandle)
       This is an overloaded member function, provided for convenience. It differs from the above
       function only in what argument(s) it accepts. Set the udp socket to use.

       Parameters:
           handle Use this handle (fd or SOCKET). Note: close() will not be called on this
           handle.

   globus_result_t globus_xio_attr_cntl (attr, driver, GLOBUS_XIO_UDP_SET_SERVICE, const char
       *service_name)
       This is an overloaded member function, provided for convenience. It differs from the above
       function only in what argument(s) it accepts. Set the udp service name to listen on.

       Parameters:
           service_name The service name to use when setting up the listener. If the service name
           cannot be resolved, the port (if one is set) will be used instead.

   globus_result_t globus_xio_attr_cntl (attr, driver, GLOBUS_XIO_UDP_GET_SERVICE, char
       **service_name_out)
       This is an overloaded member function, provided for convenience. It differs from the above
       function only in what argument(s) it accepts. Get the service name to listen on.

       Parameters:
           service_name_out A pointer to the service name will be stored here If none is set,
           NULL will be passed back. Otherwise, the name will be duplicated with strdup() and the
           user should call free() on it.

   globus_result_t globus_xio_attr_cntl (attr, driver, GLOBUS_XIO_UDP_SET_PORT, intlistener_port)
       This is an overloaded member function, provided for convenience. It differs from the above
       function only in what argument(s) it accepts. Set the port number to listen on. The
       default is 0 (system assigned)

       Parameters:
           listener_port The port number to use when setting up the listener. If the service name
           is also set, this will only be used if that can't be resolved.

   globus_result_t globus_xio_attr_cntl (attr, driver, GLOBUS_XIO_UDP_GET_PORT, int
       *listener_port_out)
       This is an overloaded member function, provided for convenience. It differs from the above
       function only in what argument(s) it accepts. the port number to listen on.

       Parameters:
           listener_port_out The port will be stored here.

   globus_result_t globus_xio_attr_cntl (attr, driver, GLOBUS_XIO_UDP_SET_LISTEN_RANGE,
       intlistener_min_port, intlistener_max_port)
       This is an overloaded member function, provided for convenience. It differs from the above
       function only in what argument(s) it accepts. Set the port range to confine the listener
       to. Used only where no specific service or port has been set. It overrides the range set
       in the GLOBUS_UDP_PORT_RANGE env variable. If 'restrict port' is true, the listening port
       will be constrained to the range specified.

       Parameters:
           listener_min_port The lower bound on the listener port. (default 0 -- no bound)
           listener_max_port The upper bound on the listener port. (default 0 -- no bound)

       See Also:
           GLOBUS_XIO_UDP_SET_RESTRICT_PORT

   globus_result_t globus_xio_attr_cntl (attr, driver, GLOBUS_XIO_UDP_GET_LISTEN_RANGE, int
       *listener_min_port_out, int *listener_max_port_out)
       This is an overloaded member function, provided for convenience. It differs from the above
       function only in what argument(s) it accepts. Get the udp port range on an attr.

       Parameters:
           listener_min_port_out The lower bound will be stored here.
           listener_max_port_out The upper bound will be stored here.

   globus_result_t globus_xio_attr_cntl (attr, driver, GLOBUS_XIO_UDP_SET_INTERFACE, const char
       *interface)
       This is an overloaded member function, provided for convenience. It differs from the above
       function only in what argument(s) it accepts. Set the interface to bind the socket to.

       Parameters:
           interface The interface to use. Can be a hostname or numeric IP

   globus_result_t globus_xio_attr_cntl (attr, driver, GLOBUS_XIO_UDP_GET_INTERFACE, char
       **interface_out)
       This is an overloaded member function, provided for convenience. It differs from the above
       function only in what argument(s) it accepts. Get the interface on the attr.

       Parameters:
           interface_out A pointer to the interface will be stored here If one is set, NULL will
           be passed back. Otherwise, the interface will be duplicated with strdup() and the user
           should call free() on it.

   globus_result_t globus_xio_attr_cntl (attr, driver, GLOBUS_XIO_UDP_SET_RESTRICT_PORT,
       globus_bool_trestrict_port)
       This is an overloaded member function, provided for convenience. It differs from the above
       function only in what argument(s) it accepts. Enable or disable the listener range
       constraints. This enables or ignores the port range found in the attr or in then env. By
       default, those ranges are enabled.

       Parameters:
           restrict_port GLOBUS_TRUE to enable (default), GLOBUS_FALSE to disable.

       See Also:
           GLOBUS_XIO_UDP_SET_LISTEN_RANGE

   globus_result_t globus_xio_attr_cntl (attr, driver, GLOBUS_XIO_UDP_GET_RESTRICT_PORT,
       globus_bool_t *restrict_port_out)
       This is an overloaded member function, provided for convenience. It differs from the above
       function only in what argument(s) it accepts. Get the restrict port flag.

       Parameters:
           restrict_port_out The restrict port flag will be stored here.

   globus_result_t globus_xio_attr_cntl (attr, driver, GLOBUS_XIO_UDP_SET_REUSEADDR,
       globus_bool_tresuseaddr)
       This is an overloaded member function, provided for convenience. It differs from the above
       function only in what argument(s) it accepts. Reuse addr when binding. Used to determine
       whether or not to allow reuse of addresses when binding a socket to a port number.

       Parameters:
           resuseaddr GLOBUS_TRUE to allow, GLOBUS_FALSE to disallow (default)

   globus_result_t globus_xio_attr_cntl (attr, driver, GLOBUS_XIO_UDP_GET_REUSEADDR,
       globus_bool_t *resuseaddr_out)
       This is an overloaded member function, provided for convenience. It differs from the above
       function only in what argument(s) it accepts. Get the reuseaddr flag on an attr.

       Parameters:
           resuseaddr_out The reuseaddr flag will be stored here.

   globus_result_t globus_xio_attr_cntl (attr, driver, GLOBUS_XIO_UDP_SET_NO_IPV6,
       globus_bool_tno_ipv6)
       This is an overloaded member function, provided for convenience. It differs from the above
       function only in what argument(s) it accepts. Restrict to IPV4 only. Disallow IPV6 sockets
       from being used (default is to use either ipv4 or ipv6)

       Parameters:
           no_ipv6 GLOBUS_TRUE to disallow ipv6, GLOBUS_FALSE to allow (default)

   globus_result_t globus_xio_attr_cntl (attr, driver, GLOBUS_XIO_UDP_GET_NO_IPV6, globus_bool_t
       *no_ipv6_out)
       This is an overloaded member function, provided for convenience. It differs from the above
       function only in what argument(s) it accepts. Get the no ipv6 flag on an attr.

       Parameters:
           no_ipv6_out The no ipv6 flag will be stored here.

   globus_result_t globus_xio_attr_cntl (attr, driver, GLOBUS_XIO_UDP_GET_HANDLE,
       globus_xio_system_socket_t *handle_out)
       This is an overloaded member function, provided for convenience. It differs from the above
       function only in what argument(s) it accepts. Get the socket handle on an attr or handle.

       Parameters:
           handle_out The udp socket will be stored here. If none is set,
           GLOBUS_XIO_UDP_INVALID_HANDLE will be set.

   globus_result_t globus_xio_handle_cntl (handle, driver, GLOBUS_XIO_UDP_GET_HANDLE,
       globus_xio_system_socket_t *handle_out)
       This is an overloaded member function, provided for convenience. It differs from the above
       function only in what argument(s) it accepts. Get the socket handle on an attr or handle.

       Parameters:
           handle_out The udp socket will be stored here. If none is set,
           GLOBUS_XIO_UDP_INVALID_HANDLE will be set.

   globus_result_t globus_xio_attr_cntl (attr, driver, GLOBUS_XIO_UDP_SET_SNDBUF, intsndbuf)
       This is an overloaded member function, provided for convenience. It differs from the above
       function only in what argument(s) it accepts. Set the socket send buffer size. Used to set
       the size of the send buffer used on the socket.

       Parameters:
           sndbuf The send buffer size in bytes to use. (default is system specific)

   globus_result_t globus_xio_handle_cntl (handle, driver, GLOBUS_XIO_UDP_SET_SNDBUF, intsndbuf)
       This is an overloaded member function, provided for convenience. It differs from the above
       function only in what argument(s) it accepts. Set the socket send buffer size. Used to set
       the size of the send buffer used on the socket.

       Parameters:
           sndbuf The send buffer size in bytes to use. (default is system specific)

   globus_result_t globus_xio_attr_cntl (attr, driver, GLOBUS_XIO_UDP_GET_SNDBUF, int
       *sndbuf_out)
       This is an overloaded member function, provided for convenience. It differs from the above
       function only in what argument(s) it accepts. Get the send buffer size on the attr or
       handle.

       Parameters:
           sndbuf_out The send buffer size will be stored here.

   globus_result_t globus_xio_handle_cntl (handle, driver, GLOBUS_XIO_UDP_GET_SNDBUF, int
       *sndbuf_out)
       This is an overloaded member function, provided for convenience. It differs from the above
       function only in what argument(s) it accepts. Get the send buffer size on the attr or
       handle.

       Parameters:
           sndbuf_out The send buffer size will be stored here.

   globus_result_t globus_xio_attr_cntl (attr, driver, GLOBUS_XIO_UDP_SET_RCVBUF, intrcvbuf)
       This is an overloaded member function, provided for convenience. It differs from the above
       function only in what argument(s) it accepts. Set the socket receive buffer size. Used to
       set the size of the receive buffer used on the socket.

       Parameters:
           rcvbuf The receive buffer size in bytes. (default is system specific)

   globus_result_t globus_xio_handle_cntl (handle, driver, GLOBUS_XIO_UDP_SET_RCVBUF, intrcvbuf)
       This is an overloaded member function, provided for convenience. It differs from the above
       function only in what argument(s) it accepts. Set the socket receive buffer size. Used to
       set the size of the receive buffer used on the socket.

       Parameters:
           rcvbuf The receive buffer size in bytes. (default is system specific)

   globus_result_t globus_xio_attr_cntl (attr, driver, GLOBUS_XIO_UDP_GET_RCVBUF, int
       *rcvbuf_out)
       This is an overloaded member function, provided for convenience. It differs from the above
       function only in what argument(s) it accepts. Get the receive buffer size on the attr or
       handle.

       Parameters:
           rcvbuf_out The receive buffer size will be stored here.

   globus_result_t globus_xio_handle_cntl (handle, driver, GLOBUS_XIO_UDP_GET_RCVBUF, int
       *rcvbuf_out)
       This is an overloaded member function, provided for convenience. It differs from the above
       function only in what argument(s) it accepts. Get the receive buffer size on the attr or
       handle.

       Parameters:
           rcvbuf_out The receive buffer size will be stored here.

   globus_result_t globus_xio_handle_cntl (handle, driver, GLOBUS_XIO_UDP_GET_CONTACT, char
       **contact_string_out)
       This is an overloaded member function, provided for convenience. It differs from the above
       function only in what argument(s) it accepts. Get the contact string associated with a
       handle or data descriptor. Use with globus_xio_handle_cntl() to get a contact string for
       the udp listener. Use with globus_xio_data_descriptor_cntl() to get the sender's contact
       string from a data descriptor passed to globus_xio_register_read().

       Parameters:
           contact_string_out A pointer to a contact string will be stored here. The user should
           free() it when done with it. It will be in the format: <hostname>:<port>

       See Also:
           GLOBUS_XIO_GET_LOCAL_CONTACT

   globus_result_t globus_xio_data_descriptor_cntl (dd, driver, GLOBUS_XIO_UDP_GET_CONTACT, char
       **contact_string_out)
       This is an overloaded member function, provided for convenience. It differs from the above
       function only in what argument(s) it accepts. Get the contact string associated with a
       handle or data descriptor. Use with globus_xio_handle_cntl() to get a contact string for
       the udp listener. Use with globus_xio_data_descriptor_cntl() to get the sender's contact
       string from a data descriptor passed to globus_xio_register_read().

       Parameters:
           contact_string_out A pointer to a contact string will be stored here. The user should
           free() it when done with it. It will be in the format: <hostname>:<port>

       See Also:
           GLOBUS_XIO_GET_LOCAL_CONTACT

   globus_result_t globus_xio_handle_cntl (handle, driver, GLOBUS_XIO_UDP_GET_NUMERIC_CONTACT,
       char **contact_string_out)
       This is an overloaded member function, provided for convenience. It differs from the above
       function only in what argument(s) it accepts. Get the contact string associated with a
       handle or data descriptor. Use with globus_xio_handle_cntl() to get a contact string for
       the udp listener. Use with globus_xio_data_descriptor_cntl() to get the sender's contact
       string from a data descriptor passed to globus_xio_register_read().

       Parameters:
           contact_string_out A pointer to a contact string will be stored here. The user should
           free() it when done with it. It will be in the format: <ip>:<port>

       See Also:
           GLOBUS_XIO_GET_LOCAL_NUMERIC_CONTACT

   globus_result_t globus_xio_data_descriptor_cntl (dd, driver,
       GLOBUS_XIO_UDP_GET_NUMERIC_CONTACT, char **contact_string_out)
       This is an overloaded member function, provided for convenience. It differs from the above
       function only in what argument(s) it accepts. Get the contact string associated with a
       handle or data descriptor. Use with globus_xio_handle_cntl() to get a contact string for
       the udp listener. Use with globus_xio_data_descriptor_cntl() to get the sender's contact
       string from a data descriptor passed to globus_xio_register_read().

       Parameters:
           contact_string_out A pointer to a contact string will be stored here. The user should
           free() it when done with it. It will be in the format: <ip>:<port>

       See Also:
           GLOBUS_XIO_GET_LOCAL_NUMERIC_CONTACT

   globus_result_t globus_xio_data_descriptor_cntl (dd, driver, GLOBUS_XIO_UDP_SET_CONTACT, char
       *contact_string)
       This is an overloaded member function, provided for convenience. It differs from the above
       function only in what argument(s) it accepts. Set the destination contact. Use on a data
       descriptor passed to globus_xio_register_write() to specify the recipient of the data.
       This is necessary with unconnected handles or to send to recipients other than the
       connected one.

       Parameters:
           contact_string A pointer to a contact string of the format
           <hostname/ip>:<port/service>

       See Also:
           GLOBUS_XIO_UDP_CONNECT

   globus_result_t globus_xio_handle_cntl (handle, driver, GLOBUS_XIO_UDP_CONNECT, char
       *contact_string)
       This is an overloaded member function, provided for convenience. It differs from the above
       function only in what argument(s) it accepts. Set the default destination contact.
       Connecting a handle to a specific contact blocks packets from any other contact. It also
       sets the default destination of all outgoing packets so, using GLOBUS_XIO_UDP_SET_CONTACT
       is unnecessary.

       Parameters:
           contact_string A pointer to a contact string of the format
           <hostname/ip>:<port/service>

   globus_result_t globus_xio_attr_cntl (attr, driver, GLOBUS_XIO_UDP_SET_MULTICAST, char
       *contact_string)
       This is an overloaded member function, provided for convenience. It differs from the above
       function only in what argument(s) it accepts. Join a multicast group. Specifiy a multicast
       group to join. All packets received will be to the specified multicast address. Do not use
       GLOBUS_XIO_UDP_CONNECT, GLOBUS_XIO_UDP_SET_PORT, or pass a contact string on the open.
       Consider using GLOBUS_XIO_UDP_SET_REUSEADDR to allow other apps to join this group. Use
       GLOBUS_XIO_UDP_SET_INTERFACE to specify the interface to use. Will not affect handles set
       with GLOBUS_XIO_UDP_SET_HANDLE. GLOBUS_XIO_UDP_SET_RESTRICT_PORT is ignored.

       Parameters:
           contact_string A pointer to a contact string of the multicast group to join with the
           format: <hostname/ip>:<port/service>

Author

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