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+PRMcastRequest
+==============
+
+Structure used to specify values for the ``PR_SockOpt_AddMember`` and
+``PR_SockOpt_DropMember`` socket options that define a request to join
+or leave a multicast group.
+
+
+Syntax
+------
+
+.. code::
+
+ #include <prio.h>
+
+ struct PRMcastRequest {
+ PRNetAddr mcaddr;
+ PRNetAddr ifaddr;
+ };
+
+ typedef struct PRMcastRequest PRMcastRequest;
+
+
+Fields
+~~~~~~
+
+The structure has the following fields:
+
+``mcaddr``
+ IP multicast address of group.
+``ifaddr``
+ Local IP address of interface.
+
+
+Description
+-----------
+
+The ``mcaddr`` and ``ifaddr`` fields are of the type :ref:`PRNetAddr`, but
+their ``port`` fields are ignored. Only the IP address (``inet.ip``)
+fields are used.