1 files changed, 85 insertions, 0 deletions
diff --git a/docs/nspr/reference/prnetaddr.rst b/docs/nspr/reference/prnetaddr.rst
new file mode 100644
index 0000000000..71fe1a65d4
--- /dev/null
+++ b/docs/nspr/reference/prnetaddr.rst
@@ -0,0 +1,85 @@
+PRNetAddr
+=========
+
+Type used with `Socket Manipulation
+Functions <Socket_Manipulation_Functions>`__ to specify a network
+address.
+
+
+Syntax
+------
+
+.. code::
+
+   #include <prio.h>
+
+   union PRNetAddr {
+     struct {
+        PRUint16 family;
+        char data[14];
+     } raw;
+     struct {
+        PRUint16 family;
+        PRUint16 port;
+        PRUint32 ip;
+        char pad[8];
+     } inet;
+   #if defined(_PR_INET6)
+     struct {
+        PRUint16 family;
+        PRUint16 port;
+        PRUint32 flowinfo;
+        PRIPv6Addr ip;
+     } ipv6;
+   #endif /* defined(_PR_INET6) */
+   };
+
+   typedef union PRNetAddr PRNetAddr;
+
+
+Fields
+~~~~~~
+
+The structure has the following fields:
+
+``family``
+   Address family: ``PR_AF_INET|PR_AF_INET6`` for ``raw.family``,
+   ``PR_AF_INET`` for ``inet.family``, ``PR_AF_INET6`` for
+   ``ipv6.family``.
+``data``
+   Raw address data.
+``port``
+   Port number of TCP or UDP, in network byte order.
+``ip``
+   The actual 32 (for ``inet.ip``) or 128 (for ``ipv6.ip``) bits of IP
+   address. The ``inet.ip`` field is in network byte order.
+``pad``
+   Unused.
+``flowinfo``
+   Routing information.
+
+
+Description
+-----------
+
+The union :ref:`PRNetAddr` represents a network address. NSPR supports only
+the Internet address family. By default, NSPR is built to support only
+IPv4, but it's possible to build the NSPR library to support both IPv4
+and IPv6. Therefore, the ``family`` field can be ``PR_AF_INET`` only for
+default NSPR, and can also be ``PR_AF_INET6`` if the binary supports
+``IPv6``.
+
+:ref:`PRNetAddr` is binary-compatible with the socket address structures in
+the familiar Berkeley socket interface, although this fact should not be
+relied upon. The raw member of the union is equivalent to
+``struct sockaddr``, the ``inet`` member is equivalent to
+``struct sockaddr_in``, and if the binary is built with ``IPv6``
+support, the ``ipv6`` member is equivalent to ``struct sockaddr_in6``.
+(Note that :ref:`PRNetAddr` does not have the ``length`` field that is
+present in ``struct sockaddr_in`` on some Unix platforms.)
+
+The macros ``PR_AF_INET``, ``PR_AF_INET6``, ``PR_INADDR_ANY``,
+``PR_INADDR_LOOPBACK`` are defined if ``prio.h`` is included.
+``PR_INADDR_ANY`` and ``PR_INADDR_LOOPBACK`` are special ``IPv4``
+addresses in host byte order, so they must be converted to network byte
+order before being assigned to the ``inet.ip`` field.