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Integration with systemd.
Currently only the minimum APIs necessary for using systemd's socket activation
feature are supported.
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L{ListenFDs} provides access to file descriptors inherited from systemd.
Typically L{ListenFDs.fromEnvironment} should be used to construct a new
instance of L{ListenFDs}.
@cvar _START: File descriptors inherited from systemd are always
consecutively numbered, with a fixed lowest "starting" descriptor. This
gives the default starting descriptor. Since this must agree with the
value systemd is using, it typically should not be overridden.
@ivar _descriptors: A C{list} of C{int} giving the descriptors which were
inherited.
@ivar _names: A L{Sequence} of C{str} giving the names of the descriptors
which were inherited.
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@param environ: A dictionary-like object to inspect to discover
inherited descriptors. By default, L{None}, indicating that the
real process environment should be inspected. The default is
suitable for typical usage.
@param start: An integer giving the lowest value of an inherited
descriptor systemd will give us. By default, L{None}, indicating
the known correct (that is, in agreement with systemd) value will be
used. The default is suitable for typical usage.
@return: A new instance of C{cls} which can be used to look up the
descriptors which have been inherited.
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@return: The configured descriptors.
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@return: A mapping from the names of configured descriptors to
their integer values.
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Parse the I{LISTEN_FDS} environment variable supplied by systemd.
@param start: systemd provides only a count of the number of descriptors
that have been inherited. This is the integer value of the first
inherited descriptor. Subsequent inherited descriptors are numbered
counting up from here. See L{ListenFDs._START}.
@param environ: The environment variable mapping in which to look for the
value to parse.
@return: The integer values of the inherited file descriptors, in order.
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Parse the I{LISTEN_FDNAMES} environment variable supplied by systemd.
@param environ: The environment variable mapping in which to look for the
value to parse.
@return: The names of the inherited descriptors, in order.
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