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+PR_OpenTCPSocket
+================
+
+Creates a new TCP socket of the specified address family.
+
+
+Syntax
+------
+
+.. code::
+
+   #include <prio.h>
+
+   PRFileDesc* PR_OpenTCPSocket(PRIntn af);
+
+
+Parameters
+~~~~~~~~~~
+
+The function has the following parameters:
+
+``af``
+   The address family of the new TCP socket. Can be ``PR_AF_INET``
+   (IPv4), ``PR_AF_INET6`` (IPv6), or ``PR_AF_LOCAL`` (Unix domain,
+   supported on POSIX systems only).
+
+
+Returns
+~~~~~~~
+
+The function returns one of the following values:
+
+-  Upon successful completion, a pointer to the :ref:`PRFileDesc` object
+   created for the newly opened TCP socket.
+-  If the creation of a new TCP socket failed, ``NULL``.
+
+
+Description
+-----------
+
+TCP (Transmission Control Protocol) is a connection-oriented, reliable
+byte-stream protocol of the TCP/IP protocol suite. :ref:`PR_OpenTCPSocket`
+creates a new TCP socket of the address family ``af``. A TCP connection
+is established by a passive socket (the server) accepting a connection
+setup request from an active socket (the client). Typically, the server
+binds its socket to a well-known port with :ref:`PR_Bind`, calls
+:ref:`PR_Listen` to start listening for connection setup requests, and
+calls :ref:`PR_Accept` to accept a connection. The client makes a
+connection request using :ref:`PR_Connect`.
+
+After a connection is established, the client and server may send and
+receive data between each other. To receive data, one can call
+:ref:`PR_Read` or :ref:`PR_Recv`. To send data, one can call :ref:`PR_Write`,
+:ref:`PR_Writev`, :ref:`PR_Send`, or :ref:`PR_TransmitFile`. :ref:`PR_AcceptRead` is
+suitable for use by the server to accept a new client connection and
+read the client's first request in one function call.
+
+A TCP connection can be shut down by :ref:`PR_Shutdown`, and the sockets
+should be closed by :ref:`PR_Close`.