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sendmsg(2) and recvmsg(2) support for Python.
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    Send a message on a socket.

    @param socket: The socket to send the message on.
    @param data: Bytes to write to the socket.
    @param ancillary: Extra data to send over the socket outside of the normal
        datagram or stream mechanism.  By default no ancillary data is sent.
    @param flags: Flags to affect how the message is sent.  See the C{MSG_}
        constants in the sendmsg(2) manual page.  By default no flags are set.

    @return: The return value of the underlying syscall, if it succeeds.
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    Receive a message on a socket.

    @param socket: The socket to receive the message on.
    @param maxSize: The maximum number of bytes to receive from the socket using
        the datagram or stream mechanism. The default maximum is 8192.
    @param cmsgSize: The maximum number of bytes to receive from the socket
        outside of the normal datagram or stream mechanism. The default maximum
        is 4096.
    @param flags: Flags to affect how the message is sent.  See the C{MSG_}
        constants in the sendmsg(2) manual page. By default no flags are set.

    @return: A named 3-tuple of the bytes received using the datagram/stream
        mechanism, a L{list} of L{tuple}s giving ancillary received data, and
        flags as an L{int} describing the data received.
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    Return the family of the given socket.

    @param socket: The socket to get the family of.
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