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+PRSocketOptionData
+==================
+
+Type for structure used with :ref:`PR_GetSocketOption` and
+:ref:`PR_SetSocketOption` to specify options for file descriptors that
+represent sockets.
+
+
+Syntax
+------
+
+.. code::
+
+   #include <prio.h>
+
+   typedef struct PRSocketOptionData
+   {
+     PRSockOption option;
+     union
+     {
+        PRUintn ip_ttl;
+        PRUintn mcast_ttl;
+        PRUintn tos;
+        PRBool non_blocking;
+        PRBool reuse_addr;
+        PRBool keep_alive;
+        PRBool mcast_loopback;
+        PRBool no_delay;
+        PRSize max_segment;
+        PRSize recv_buffer_size;
+        PRSize send_buffer_size;
+        PRLinger linger;
+        PRMcastRequest add_member;
+        PRMcastRequest drop_member;
+        PRNetAddr mcast_if;
+     } value;
+   } PRSocketOptionData;
+
+
+Fields
+~~~~~~
+
+The structure has the following fields:
+
+``ip_ttl``
+   IP time-to-live.
+``mcast_ttl``
+   IP multicast time-to-live.
+``tos``
+   IP type-of-service and precedence.
+``non_blocking``
+   Nonblocking (network) I/O.
+``reuse_addr``
+   Allow local address reuse.
+``keep_alive``
+   Periodically test whether connection is still alive.
+``mcast_loopback``
+   IP multicast loopback.
+``no_delay``
+   Disable Nagle algorithm. Don't delay send to coalesce packets.
+``max_segment``
+   TCP maximum segment size.
+``recv_buffer_size``
+   Receive buffer size.
+``send_buffer_size``
+   Send buffer size.
+``linger``
+   Time to linger on close if data are present in socket send buffer.
+``add_member``
+   Join an IP multicast group.
+``drop_member``
+   Leave an IP multicast group.
+``mcast_if``
+   IP multicast interface address.
+
+
+Description
+~~~~~~~~~~~
+
+:ref:`PRSocketOptionData` is a name-value pair for a socket option. The
+``option`` field (of enumeration type :ref:`PRSockOption`) specifies the
+name of the socket option, and the ``value`` field (a union of all
+possible values) specifies the value of the option.