helpers.py 文件源码

def reset_connection(client):
    # Close the connection with a TCP RST instead of a TCP FIN.  client must
    # be a smtplib.SMTP instance.
    #
    # https://stackoverflow.com/a/6440364/1570972
    #
    # socket(7) SO_LINGER option.
    #
    # struct linger {
    #   int l_onoff;    /* linger active */
    #   int l_linger;   /* how many seconds to linger for */
    # };
    #
    # Is this correct for Windows/Cygwin and macOS?
    struct_format = 'hh' if sys.platform == 'win32' else 'ii'
    l_onoff = 1
    l_linger = 0
    client.sock.setsockopt(
        socket.SOL_SOCKET,
        socket.SO_LINGER,
        struct.pack(struct_format, l_onoff, l_linger))
    client.close()


# For integration with flufl.testing.