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+PRLinger
+========
+
+Structure used with the ``PR_SockOpt_Linger`` socket option to specify
+the time interval (in :ref:`PRIntervalTime` units) to linger on closing a
+socket if any data remain in the socket send buffer.
+
+
+Syntax
+~~~~~~
+
+.. code::
+
+   #include <prio.h>
+
+   typedef struct PRLinger {
+     PRBool polarity;
+     PRIntervalTime linger;
+   } PRLinger;
+
+
+Fields
+~~~~~~
+
+The structure has the following fields:
+
+``polarity``
+   Polarity of the option's setting: ``PR_FALSE`` means the option is
+   off, in which case the value of ``linger`` is ignored. ``PR_TRUE``
+   means the option is on, and the value of ``linger`` will be used to
+   determine how long :ref:`PR_Close` waits before returning.
+``linger``
+   Time (in :ref:`PRIntervalTime` units) to linger before closing if any
+   data remain in the socket send buffer.
+
+
+Description
+~~~~~~~~~~~
+
+By default, :ref:`PR_Close` returns immediately, but if there are any data
+remaining in the socket send buffer, the system attempts to deliver the
+data to the peer. The ``PR_SockOpt_Linger`` socket option, with a value
+represented by a structure of type :ref:`PRLinger`, makes it possible to
+change this default as follows:
+
+-  If ``polarity`` is set to ``PR_FALSE``, :ref:`PR_Close` returns
+   immediately, but if there are any data remaining in the socket send
+   buffer, the runtime attempts to deliver the data to the peer.
+-  If ``polarity`` is set to ``PR_TRUE`` and ``linger`` is set to 0
+   (``PR_INTERVAL_NO_WAIT``), the runtime aborts the connection when it
+   is closed and discards any data remaining in the socket send buffer.
+-  If ``polarity`` is set to ``PR_TRUE`` and ``linger`` is nonzero, the
+   runtime *lingers* when the socket is closed. That is, if any data
+   remains in the socket send buffer, :ref:`PR_Close` blocks until either
+   all the data is sent and acknowledged by the peer or the interval
+   specified by ``linger`` expires.