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    the necessary privileges, see journalctl(1) for details.  Unprivileged users
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    >>> j = journal.Reader()
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    >>> j.log_level(journal.LOG_INFO)
    >>> j.add_match(_SYSTEMD_UNIT="systemd-udevd.service")
    >>> for entry in j:                                 # doctest: +SKIP
    ...    print(entry['MESSAGE'])
    starting version ...

    See systemd.journal-fields(7) for more info on typical fields found in the
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        and SYSTEM_ONLY opens only journal files of system services and the kernel.

        Argument `path` is the directory of journal files, either a file system
        path or a file descriptor. Note that `flags`, `path`, and `files` are
        exclusive.

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        DEFAULT_CONVERTERS to convert journal field values. Field names are used
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        value. When there's no entry for a field name, then the default UTF-8
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        datetime.datetime instance. The integer form is deprecated.

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�|j�D��t|�S)aASend a message to the journal.

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    >>> journal.send('Hello, again, world', FIELD2='Greetings!')
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    Value of the MESSAGE argument will be used for the MESSAGE= field. MESSAGE
    must be a string and will be sent as UTF-8 to the journal.

    MESSAGE_ID can be given to uniquely identify the type of message. It must be
    a string or a uuid.UUID object.

    CODE_LINE, CODE_FILE, and CODE_FUNC can be specified to identify the caller.
    Unless at least on of the three is given, values are extracted from the
    stack frame of the caller of send(). CODE_FILE and CODE_FUNC must be
    strings, CODE_LINE must be an integer.

    Additional fields for the journal entry can only be specified as keyword
    arguments. The payload can be either a string or bytes. A string will be
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    >>> from systemd import journal
    >>> stream = journal.stream('myapp')                       # doctest: +SKIP
    >>> res = stream.write('message...\n')                     # doctest: +SKIP

    will produce the following message in the journal::

      PRIORITY=7
      SYSLOG_IDENTIFIER=myapp
      MESSAGE=message...

    If identifier is None, a suitable default based on sys.argv[0] will be used.

    This interface can be used conveniently with the print function:

    >>> from __future__ import print_function
    >>> stream = journal.stream()                              # doctest: +SKIP
    >>> print('message...', file=stream)                       # doctest: +SKIP

    priority is the syslog priority, one of `LOG_EMERG`, `LOG_ALERT`,
    `LOG_CRIT`, `LOG_ERR`, `LOG_WARNING`, `LOG_NOTICE`, `LOG_INFO`, `LOG_DEBUG`.

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    >>> log.propagate = False
    >>> log.addHandler(JournalHandler())
    >>> log.warning("Some message: %s", 'detail')

    Note that by default, message levels `INFO` and `DEBUG` are ignored by the
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    >>> log.setLevel(logging.DEBUG)

    To redirect all logging messages to journal regardless of where they come
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    >>> logging.root.addHandler(JournalHandler())

    For more complex configurations when using `dictConfig` or `fileConfig`,
    specify `systemd.journal.JournalHandler` as the handler class.  Only
    standard handler configuration options are supported: `level`, `formatter`,
    `filters`.

    To attach journal MESSAGE_ID, an extra field is supported:

    >>> import uuid
    >>> mid = uuid.UUID('0123456789ABCDEF0123456789ABCDEF')
    >>> log.warning("Message with ID", extra={'MESSAGE_ID': mid})

    Fields to be attached to all messages sent through this handler can be
    specified as keyword arguments. This probably makes sense only for
    SYSLOG_IDENTIFIER and similar fields which are constant for the whole
    program:

    >>> JournalHandler(SYSLOG_IDENTIFIER='my-cool-app')
    <...JournalHandler ...>

    The following journal fields will be sent: `MESSAGE`, `PRIORITY`,
    `THREAD_NAME`, `CODE_FILE`, `CODE_LINE`, `CODE_FUNC`, `LOGGER` (name as
    supplied to getLogger call), `MESSAGE_ID` (optional, see above),
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