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.. _tcp:
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:c:type:`uv_tcp_t` --- TCP handle
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=================================
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TCP handles are used to represent both TCP streams and servers.
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:c:type:`uv_tcp_t` is a 'subclass' of :c:type:`uv_stream_t`.
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Data types
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----------
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.. c:type:: uv_tcp_t
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TCP handle type.
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Public members
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^^^^^^^^^^^^^^
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N/A
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.. seealso:: The :c:type:`uv_stream_t` members also apply.
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API
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---
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.. c:function:: int uv_tcp_init(uv_loop_t*, uv_tcp_t* handle)
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Initialize the handle.
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.. c:function:: int uv_tcp_open(uv_tcp_t* handle, uv_os_sock_t sock)
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Open an existing file descriptor or SOCKET as a TCP handle.
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.. versionchanged:: 1.2.1 the file descriptor is set to non-blocking mode.
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.. c:function:: int uv_tcp_nodelay(uv_tcp_t* handle, int enable)
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Enable / disable Nagle's algorithm.
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.. c:function:: int uv_tcp_keepalive(uv_tcp_t* handle, int enable, unsigned int delay)
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Enable / disable TCP keep-alive. `delay` is the initial delay in seconds,
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ignored when `enable` is zero.
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.. c:function:: int uv_tcp_simultaneous_accepts(uv_tcp_t* handle, int enable)
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Enable / disable simultaneous asynchronous accept requests that are
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queued by the operating system when listening for new TCP connections.
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This setting is used to tune a TCP server for the desired performance.
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Having simultaneous accepts can significantly improve the rate of accepting
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connections (which is why it is enabled by default) but may lead to uneven
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load distribution in multi-process setups.
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.. c:function:: int uv_tcp_bind(uv_tcp_t* handle, const struct sockaddr* addr, unsigned int flags)
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Bind the handle to an address and port. `addr` should point to an
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initialized ``struct sockaddr_in`` or ``struct sockaddr_in6``.
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When the port is already taken, you can expect to see an ``UV_EADDRINUSE``
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error from either :c:func:`uv_tcp_bind`, :c:func:`uv_listen` or
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:c:func:`uv_tcp_connect`. That is, a successful call to this function does
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not guarantee that the call to :c:func:`uv_listen` or :c:func:`uv_tcp_connect`
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will succeed as well.
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`flags` con contain ``UV_TCP_IPV6ONLY``, in which case dual-stack support
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is disabled and only IPv6 is used.
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.. c:function:: int uv_tcp_getsockname(const uv_tcp_t* handle, struct sockaddr* name, int* namelen)
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Get the current address to which the handle is bound. `addr` must point to
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a valid and big enough chunk of memory, ``struct sockaddr_storage`` is
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recommended for IPv4 and IPv6 support.
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.. c:function:: int uv_tcp_getpeername(const uv_tcp_t* handle, struct sockaddr* name, int* namelen)
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Get the address of the peer connected to the handle. `addr` must point to
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a valid and big enough chunk of memory, ``struct sockaddr_storage`` is
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recommended for IPv4 and IPv6 support.
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.. c:function:: int uv_tcp_connect(uv_connect_t* req, uv_tcp_t* handle, const struct sockaddr* addr, uv_connect_cb cb)
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Establish an IPv4 or IPv6 TCP connection. Provide an initialized TCP handle
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and an uninitialized :c:type:`uv_connect_t`. `addr` should point to an
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initialized ``struct sockaddr_in`` or ``struct sockaddr_in6``.
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The callback is made when the connection has been established or when a
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connection error happened.
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.. seealso:: The :c:type:`uv_stream_t` API functions also apply.
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