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test	[ DIR ]	drwxr-xr-x
__init__.py	598 B	-rw-r--r--
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failure.py	26.37 KB	-rw-r--r--
fakepwd.py	6.57 KB	-rw-r--r--
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runtime.py	5.79 KB	-rw-r--r--
sendmsg.py	2.62 KB	-rw-r--r--
shortcut.py	2.25 KB	-rw-r--r--
syslog.py	3.57 KB	-rw-r--r--
systemd.py	2.92 KB	-rw-r--r--
text.py	5.29 KB	-rw-r--r--
threadable.py	3.25 KB	-rw-r--r--
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url.py	244 B	-rw-r--r--
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win32.py	4.68 KB	-rw-r--r--
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Code Editor : systemd.py

# -*- test-case-name: twisted.python.test.test_systemd -*-
# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.

"""
Integration with systemd.

Currently only the minimum APIs necessary for using systemd's socket activation
feature are supported.
"""

__all__ = ["ListenFDs"]

from os import getpid
from typing import Iterable, List, Mapping, Optional

class ListenFDs:
    """
    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.
    """

_START = 3

def __init__(self, descriptors: List[int]) -> None:
        """
        @param descriptors: The descriptors which will be returned from calls to
            C{inheritedDescriptors}.
        """
        self._descriptors = descriptors

@classmethod
    def fromEnvironment(
        cls,
        environ: Optional[Mapping[str, str]] = None,
        start: Optional[int] = None,
    ) -> "ListenFDs":
        """
        @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.
        """
        if environ is None:
            from os import environ as _environ

environ = _environ
        if start is None:
            start = cls._START

descriptors: List[int] = []

try:
            pid = int(environ["LISTEN_PID"])
        except (KeyError, ValueError):
            pass
        else:
            if pid == getpid():
                try:
                    count = int(environ["LISTEN_FDS"])
                except (KeyError, ValueError):
                    pass
                else:
                    descriptors = list(range(start, start + count))
                    del environ["LISTEN_PID"], environ["LISTEN_FDS"]

return cls(descriptors)

def inheritedDescriptors(self) -> Iterable[int]:
        """
        @return: The configured descriptors.
        """
        return list(self._descriptors)

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Code Editor : systemd.py