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LFtid1056/lib/libuv-v1.51.0/docs/src/pipe.rst
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LFtid1056/lib/libuv-v1.51.0/docs/src/pipe.rst
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.. _pipe:
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:c:type:`uv_pipe_t` --- Pipe handle
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===================================
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Pipe handles provide an abstraction over streaming files on Unix (including
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local domain sockets, pipes, and FIFOs) and named pipes on Windows.
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:c:type:`uv_pipe_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_pipe_t
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Pipe handle type.
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Public members
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^^^^^^^^^^^^^^
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.. c:member:: int uv_pipe_t.ipc
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Whether this pipe is suitable for handle passing between processes.
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Only a connected pipe that will be passing the handles should have this flag
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set, not the listening pipe that uv_accept is called on.
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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_pipe_init(uv_loop_t* loop, uv_pipe_t* handle, int ipc)
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Initialize a pipe handle. The `ipc` argument is a boolean to indicate if
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this pipe will be used for handle passing between processes (which may
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change the bytes on the wire). Only a connected pipe that will be
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passing the handles should have this flag set, not the listening pipe
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that uv_accept is called on.
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.. c:function:: int uv_pipe_open(uv_pipe_t* handle, uv_file file)
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Open an existing file descriptor or HANDLE as a pipe.
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.. versionchanged:: 1.2.1 the file descriptor is set to non-blocking mode.
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.. note::
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The passed file descriptor or HANDLE is not checked for its type, but
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it's required that it represents a valid pipe.
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.. c:function:: int uv_pipe_bind(uv_pipe_t* handle, const char* name)
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Bind the pipe to a file path (Unix) or a name (Windows).
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Does not support Linux abstract namespace sockets,
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unlike :c:func:`uv_pipe_bind2`.
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Alias for ``uv_pipe_bind2(handle, name, strlen(name), 0)``.
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.. note::
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Paths on Unix get truncated to ``sizeof(sockaddr_un.sun_path)`` bytes,
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typically between 92 and 108 bytes.
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.. c:function:: int uv_pipe_bind2(uv_pipe_t* handle, const char* name, size_t namelen, unsigned int flags)
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Bind the pipe to a file path (Unix) or a name (Windows).
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``flags`` must be zero or ``UV_PIPE_NO_TRUNCATE``. Returns ``UV_EINVAL``
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for unsupported flags without performing the bind operation.
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Supports Linux abstract namespace sockets. ``namelen`` must include
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the leading nul byte but not the trailing nul byte.
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.. versionadded:: 1.46.0
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.. note::
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Paths on Unix get truncated to ``sizeof(sockaddr_un.sun_path)`` bytes,
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typically between 92 and 108 bytes, unless the ``UV_PIPE_NO_TRUNCATE``
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flag is specified, in which case an ``UV_EINVAL`` error is returned.
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.. c:function:: void uv_pipe_connect(uv_connect_t* req, uv_pipe_t* handle, const char* name, uv_connect_cb cb)
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Connect to the Unix domain socket or the Windows named pipe.
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Does not support Linux abstract namespace sockets,
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unlike :c:func:`uv_pipe_connect2`.
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Alias for ``uv_pipe_connect2(req, handle, name, strlen(name), 0, cb)``.
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.. note::
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Paths on Unix get truncated to ``sizeof(sockaddr_un.sun_path)`` bytes,
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typically between 92 and 108 bytes.
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.. c:function:: void uv_pipe_connect2(uv_connect_t* req, uv_pipe_t* handle, const char* name, size_t namelen, unsigned int flags, uv_connect_cb cb)
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Connect to the Unix domain socket or the Windows named pipe.
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``flags`` must be zero or ``UV_PIPE_NO_TRUNCATE``. Returns ``UV_EINVAL``
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for unsupported flags without performing the connect operation.
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Supports Linux abstract namespace sockets. ``namelen`` must include
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the leading nul byte but not the trailing nul byte.
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.. versionadded:: 1.46.0
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.. note::
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Paths on Unix get truncated to ``sizeof(sockaddr_un.sun_path)`` bytes,
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typically between 92 and 108 bytes, unless the ``UV_PIPE_NO_TRUNCATE``
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flag is specified, in which case an ``UV_EINVAL`` error is returned.
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.. c:function:: int uv_pipe_getsockname(const uv_pipe_t* handle, char* buffer, size_t* size)
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Get the name of the Unix domain socket or the named pipe.
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A preallocated buffer must be provided. The size parameter holds the length
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of the buffer and it's set to the number of bytes written to the buffer on
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output. If the buffer is not big enough ``UV_ENOBUFS`` will be returned and
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len will contain the required size.
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.. versionchanged:: 1.3.0 the returned length no longer includes the terminating null byte,
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and the buffer is not null terminated.
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.. c:function:: int uv_pipe_getpeername(const uv_pipe_t* handle, char* buffer, size_t* size)
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Get the name of the Unix domain socket or the named pipe to which the handle
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is connected.
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A preallocated buffer must be provided. The size parameter holds the length
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of the buffer and it's set to the number of bytes written to the buffer on
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output. If the buffer is not big enough ``UV_ENOBUFS`` will be returned and
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len will contain the required size.
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.. versionadded:: 1.3.0
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.. c:function:: void uv_pipe_pending_instances(uv_pipe_t* handle, int count)
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Set the number of pending pipe instance handles when the pipe server is
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waiting for connections.
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.. note::
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This setting applies to Windows only.
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.. c:function:: int uv_pipe_pending_count(uv_pipe_t* handle)
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.. c:function:: uv_handle_type uv_pipe_pending_type(uv_pipe_t* handle)
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Used to receive handles over IPC pipes.
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First - call :c:func:`uv_pipe_pending_count`, if it's > 0 then initialize
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a handle of the given `type`, returned by :c:func:`uv_pipe_pending_type`
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and call ``uv_accept(pipe, handle)``.
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.. seealso:: The :c:type:`uv_stream_t` API functions also apply.
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.. c:function:: int uv_pipe_chmod(uv_pipe_t* handle, int flags)
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Alters pipe permissions, allowing it to be accessed from processes run by
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different users. Makes the pipe writable or readable by all users. Mode can
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be ``UV_WRITABLE``, ``UV_READABLE`` or ``UV_WRITABLE | UV_READABLE``. This
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function is blocking.
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.. versionadded:: 1.16.0
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.. c:function:: int uv_pipe(uv_file fds[2], int read_flags, int write_flags)
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Create a pair of connected pipe handles.
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Data may be written to `fds[1]` and read from `fds[0]`.
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The resulting handles can be passed to `uv_pipe_open`, used with `uv_spawn`,
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or for any other purpose.
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Valid values for `flags` are:
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- UV_NONBLOCK_PIPE: Opens the specified socket handle for `OVERLAPPED`
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or `FIONBIO`/`O_NONBLOCK` I/O usage.
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This is recommended for handles that will be used by libuv,
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and not usually recommended otherwise.
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Equivalent to :man:`pipe(2)` with the `O_CLOEXEC` flag set.
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.. versionadded:: 1.41.0
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