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+PRSockOption
+============
+
+Enumeration type used in the ``option`` field of :ref:`PRSocketOptionData`
+to form the name portion of a name-value pair.
+
+
+Syntax
+------
+
+.. code::
+
+   #include <prio.h>
+
+   typedef enum PRSockOption {
+     PR_SockOpt_Nonblocking,
+     PR_SockOpt_Linger,
+     PR_SockOpt_Reuseaddr,
+     PR_SockOpt_Keepalive,
+     PR_SockOpt_RecvBufferSize,
+     PR_SockOpt_SendBufferSize,
+     PR_SockOpt_IpTimeToLive,
+     PR_SockOpt_IpTypeOfService,
+     PR_SockOpt_AddMember,
+     PR_SockOpt_DropMember,
+     PR_SockOpt_McastInterface,
+     PR_SockOpt_McastTimeToLive,
+     PR_SockOpt_McastLoopback,
+     PR_SockOpt_NoDelay,
+     PR_SockOpt_MaxSegment,
+     PR_SockOpt_Last
+   } PRSockOption;
+
+
+Enumerators
+~~~~~~~~~~~
+
+The enumeration has the following enumerators:
+
+``PR_SockOpt_Nonblocking``
+   Nonblocking I/O.
+``PR_SockOpt_Linger``
+   Time to linger on close if data is present in the socket send buffer.
+``PR_SockOpt_Reuseaddr``
+   Allow local address reuse.
+``PR_SockOpt_Keepalive``
+   Periodically test whether connection is still alive.
+``PR_SockOpt_RecvBufferSize``
+   Receive buffer size.
+``PR_SockOpt_SendBufferSize``
+   Send buffer size.
+``PR_SockOpt_IpTimeToLive``
+   IP time-to-live.
+``PR_SockOpt_IpTypeOfService``
+   IP type-of-service and precedence.
+``PR_SockOpt_AddMember``
+   Join an IP multicast group.
+``PR_SockOpt_DropMember``
+   Leave an IP multicast group.
+``PR_SockOpt_McastInterface``
+   IP multicast interface address.
+``PR_SockOpt_McastTimeToLive``
+   IP multicast time-to-live.
+``PR_SockOpt_McastLoopback``
+   IP multicast loopback.
+``PR_SockOpt_NoDelay``
+   Disable Nagle algorithm. Don't delay send to coalesce packets.
+``PR_SockOpt_MaxSegment``
+   Maximum segment size.
+``PR_SockOpt_Last``
+   Always one greater than the maximum valid socket option numerator.
+
+
+Description
+-----------
+
+The :ref:`PRSockOption` enumeration consists of all the socket options
+supported by NSPR. The ``option`` field of :ref:`PRSocketOptionData` should
+be set to an enumerator of type :ref:`PRSockOption`.