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+PR_NewTCPSocket
+===============
+
+Creates a new IPv4 TCP socket.
+
+
+Syntax
+------
+
+.. code::
+
+   #include <prio.h>
+
+   PRFileDesc* PR_NewTCPSocket(void);
+
+
+Returns
+~~~~~~~
+
+The function returns one of the following values:
+
+-  Upon successful completion, a pointer to the :ref:`PRFileDesc` object
+   created for the newly opened IPv4 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_NewTCPSocket`
+creates a new IPv4 TCP socket. 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`.
+
+
+See Also
+--------
+
+:ref:`PR_NewTCPSocket` is deprecated because it is hardcoded to create an
+IPv4 TCP socket. New code should use :ref:`PR_OpenTCPSocket` instead, which
+allows the address family (IPv4 or IPv6) of the new TCP socket to be
+specified.