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This module contains interfaces defined for the L{twisted.conch} package.
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        the channel type is unknown, we return C{None}.

        For other failures, we raise an exception. If a
        L{ConchError<error.ConchError>} is raised, the C{.value} will
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        @param channelType: The requested channel type
        @type channelType:  L{bytes}
        @param windowSize:  The initial size of the remote window
        @type windowSize:   L{int}
        @param maxPacket:   The largest packet we should send
        @type maxPacket:    L{int}
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        security hazard.  It is recommended that implementations either
        maintain a list of allowable variable names or only set environment
        variables after the server process has dropped sufficient
        privileges."

        (OpenSSH refuses all environment variables by default, but has an
        C{AcceptEnv} configuration option to select specific variables to
        accept.)

        @param name: The name of the environment variable to set.
        @type name: L{bytes}
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        L{twisted.conch.ssh.filetransfer} as FXF_*.

        @param attrs: a list of attributes to open the file with.  It is a
        dictionary, consisting of 0 or more keys.  The possible keys are::

            size: the size of the file in bytes
            uid: the user ID of the file as an integer
            gid: the group ID of the file as an integer
            permissions: the permissions of the file with as an integer.
            the bit representation of this field is defined by POSIX.
            atime: the access time of the file as seconds since the epoch.
            mtime: the modification time of the file as seconds since the epoch.
            ext_*: extended attributes.  The server is not required to
            understand this, but it may.

        NOTE: there is no way to indicate text or binary files.  it is up
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        This method returns an object that meets the ISFTPFile interface.
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        be used.

        The iterable should return triples of the form (filename,
        longname, attrs) or Deferreds that return the same.  The
        sequence must support __getitem__, but otherwise may be any
        'sequence-like' object.

        filename is the name of the file relative to the directory.
        logname is an expanded format of the filename.  The recommended format
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        -rwxr-xr-x   1 mjos     staff      348911 Mar 25 14:29 t-filexfer
        1234567890 123 12345678 12345678 12345678 123456789012

        The first line is sample output, the second is the length of the field.
        The fields are: permissions, link count, user owner, group owner,
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�makeLinkzISFTPServer.makeLink@rrc��y)z�
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        @param extendedName: the name of the request as a string.
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        @param offset: an integer that is the index to start from in the file.
        @param length: the maximum length of data to return.  The actual amount
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writeChunkzISFTPFile.writeChunk�rrc��y)z�
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