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//proc/self/root/lib/python3/dist-packages/twisted/runner/inetd.py

# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.

"""
Twisted inetd.

Maintainer: Andrew Bennetts

Future Plans: Bugfixes.  Specifically for UDP and Sun-RPC, which don't work
correctly yet.
"""

import os

from twisted.internet import process, reactor, fdesc
from twisted.internet.protocol import Protocol, ServerFactory
from twisted.protocols import wire

# A dict of known 'internal' services (i.e. those that don't involve spawning
# another process.
internalProtocols = {
    'echo': wire.Echo,
    'chargen': wire.Chargen,
    'discard': wire.Discard,
    'daytime': wire.Daytime,
    'time': wire.Time,
}

class InetdProtocol(Protocol):
    """Forks a child process on connectionMade, passing the socket as fd 0."""
    def connectionMade(self):
        sockFD = self.transport.fileno()
        childFDs = {0: sockFD, 1: sockFD}
        if self.factory.stderrFile:
            childFDs[2] = self.factory.stderrFile.fileno()

# processes run by inetd expect blocking sockets
        # FIXME: maybe this should be done in process.py?  are other uses of
        #        Process possibly affected by this?
        fdesc.setBlocking(sockFD)
        if 2 in childFDs:
            fdesc.setBlocking(childFDs[2])

service = self.factory.service
        uid = service.user
        gid = service.group

# don't tell Process to change our UID/GID if it's what we
        # already are
        if uid == os.getuid():
            uid = None
        if gid == os.getgid():
            gid = None

process.Process(None, service.program, service.programArgs, os.environ,
                        None, None, uid, gid, childFDs)

reactor.removeReader(self.transport)
        reactor.removeWriter(self.transport)

class InetdFactory(ServerFactory):
    protocol = InetdProtocol
    stderrFile = None
    
    def __init__(self, service):
        self.service = service