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.