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# ``twisted`.`internet`.`posixbase`.`PosixReactorBase``

class documentation

`class PosixReactorBase(_DisconnectSelectableMixin, ReactorBase): (source)`

Known subclasses: `twisted.internet._glibbase.GlibReactorBase`, `twisted.internet._threadedselect.ThreadedSelectReactor`, `twisted.internet.asyncioreactor.AsyncioSelectorReactor`, `twisted.internet.cfreactor.CFReactor`, `twisted.internet.epollreactor.EPollReactor`, `twisted.internet.kqreactor.KQueueReactor`, `twisted.internet.pollreactor.PollReactor`, `twisted.internet.selectreactor.SelectReactor`, `twisted.internet.win32eventreactor.Win32Reactor`

Implements interfaces: `twisted.internet.interfaces.IReactorMulticast`, `twisted.internet.interfaces.IReactorProcess`, `twisted.internet.interfaces.IReactorSocket`, `twisted.internet.interfaces.IReactorSSL`, `twisted.internet.interfaces.IReactorTCP`, `twisted.internet.interfaces.IReactorUDP`, `twisted.internet.interfaces.IReactorUNIX`, `twisted.internet.interfaces.IReactorUNIXDatagram`

View In Hierarchy

A basis for reactors that use file descriptors.

Method | `adoptDatagramPort` | Add an existing listening SOCK_DGRAM socket to the reactor to monitor for read and write readiness.
Method | `adoptStreamConnection` | No summary
Method | `adoptStreamPort` | Create a new `IListeningPort` from an already-initialized socket.
Method | `connectSSL` | Connect a client Protocol to a remote SSL socket.
Method | `connectTCP` | Connect a TCP client.
Method | `connectUNIX` | Connect a client protocol to a UNIX socket.
Method | `connectUNIXDatagram` | Connects a `ConnectedDatagramProtocol` instance to a path.
Method | `installWaker` | Install a `waker' to allow threads and signals to wake up the IO thread.
Method | `listenMulticast` | Connects a given DatagramProtocol to the given numeric UDP port.
Method | `listenSSL` | Connects a given protocol factory to the given numeric TCP/IP port. The connection is a SSL one, using contexts created by the context factory.
Method | `listenTCP` | Connects a given protocol factory to the given numeric TCP/IP port.
Method | `listenUDP` | Connects a given `DatagramProtocol` to the given numeric UDP port.
Method | `listenUNIX` | Listen on a UNIX socket.
Method | `listenUNIXDatagram` | Connects a given `DatagramProtocol` to the given path.
Method | `spawnProcess` | Spawn a process, with a process protocol.
Instance Variable | `waker` | Undocumented
Method | `_removeAll` | Remove all readers and writers, and list of removed `IReadDescriptor`s and `IWriteDescriptor`s.
Method | `_signalsFactory` | Customize reactor signal handling to support child processes on POSIX platforms.
Method | `_wakerFactory` | Undocumented
Class Variable | `_supportedAddressFamilies` | Undocumented
Instance Variable | `_childWaker` | `None` or a reference to the `_SIGCHLDWaker` which is used to properly notice child process termination.

Inherited from `_DisconnectSelectableMixin`:

Method | `_disconnectSelectable` | Utility function for disconnecting a selectable.

Inherited from `ReactorBase` (via `_DisconnectSelectableMixin`):

Method | `__init__` | Undocumented
Method | `addReader` | Undocumented
Method | `addSystemEventTrigger` | See twisted.internet.interfaces.IReactorCore.addSystemEventTrigger.
Method | `addWriter` | Undocumented
Method | `callFromThread` | See `twisted.internet.interfaces.IReactorFromThreads.callFromThread`.
Method | `callInThread` | See `twisted.internet.interfaces.IReactorInThreads.callInThread`.
Method | `callLater` | See twisted.internet.interfaces.IReactorTime.callLater.
Method | `callWhenRunning` | See twisted.internet.interfaces.IReactorCore.callWhenRunning.
Method | `crash` | See twisted.internet.interfaces.IReactorCore.crash.
Method | `disconnectAll` | Disconnect every reader, and writer in the system.
Method | `doIteration` | Do one iteration over the readers and writers which have been added.
Method | `fireSystemEvent` | See twisted.internet.interfaces.IReactorCore.fireSystemEvent.
Method | `getDelayedCalls` | See `twisted.internet.interfaces.IReactorTime.getDelayedCalls`
Method | `getReaders` | Undocumented
Method | `getThreadPool` | See `twisted.internet.interfaces.IReactorThreads.getThreadPool`.
Method | `getWriters` | Undocumented
Method | `iterate` | See twisted.internet.interfaces.IReactorCore.iterate.
Method | `mainLoop` | Undocumented
Method | `removeAll` | Undocumented
Method | `removeReader` | Undocumented
Method | `removeSystemEventTrigger` | See twisted.internet.interfaces.IReactorCore.removeSystemEventTrigger.
Method | `removeWriter` | Undocumented
Method | `resolve` | Return a Deferred that will resolve a hostname.
Method | `run` | Fire 'startup' System Events, move the reactor to the 'running' state, then run the main loop until it is stopped with `stop()` or `crash()`.
Method | `runUntilCurrent` | Run all pending timed calls.
Method | `sigBreak` | Handle a SIGBREAK interrupt.
Method | `sigInt` | Handle a SIGINT interrupt.
Method | `sigTerm` | Handle a SIGTERM interrupt.
Method | `startRunning` | Method called when reactor starts: do some initialization and fire startup events.
Method | `stop` | See twisted.internet.interfaces.IReactorCore.stop.
Method | `suggestThreadPoolSize` | See `twisted.internet.interfaces.IReactorThreads.suggestThreadPoolSize`.
Method | `timeout` | Determine the longest time the reactor may sleep (waiting on I/O notification, perhaps) before it must wake up to service a time-related event.
Method | `wakeUp` | Wake up the event loop.
Class Variable | `__name__` | Undocumented
Class Variable | `installed` | Undocumented
Class Variable | `seconds` | Get the current time in seconds.
Instance Variable | `running` | See `IReactorCore.running`
Instance Variable | `threadCallQueue` | Undocumented
Instance Variable | `threadpool` | Undocumented
Instance Variable | `threadpoolShutdownID` | Undocumented
Instance Variable | `usingThreads` | Undocumented
Method | `_addInternalReader` | Add a read descriptor which is part of the implementation of the reactor itself.
Method | `_cancelCallLater` | Undocumented
Method | `_initThreadPool` | Create the threadpool accessible with callFromThread.
Method | `_initThreads` | Undocumented
Method | `_insertNewDelayedCalls` | Undocumented
Method | `_makeSignalHandling` | Get an appropriate signal handling object.
Method | `_moveCallLaterSooner` | Undocumented
Method | `_reallyStartRunning` | Method called to transition to the running state. This should happen in the during startup event trigger phase.
Method | `_removeInternalReader` | Remove a read descriptor which is part of the implementation of the reactor itself.
Method | `_stopThreadPool` | Stop the reactor threadpool. This method is only valid if there is currently a threadpool (created by `_initThreadPool`). It is not intended to be called directly; instead, it will be called by a shutdown trigger created in ...
Method | `_uninstallHandler` | Undocumented
Class Variable | `_lock` | Undocumented
Instance Variable | `_cancellations` | Undocumented
Instance Variable | `_eventTriggers` | Undocumented
Instance Variable | `_exitSignal` | See `_ISupportsExitSignalCapturing._exitSignal`
Instance Variable | `_installSignalHandlers` | A flag which indicates whether any signal handlers will be installed during startup. This includes handlers for SIGCHLD to monitor child processes, and SIGINT, SIGTERM, and SIGBREAK
Instance Variable | `_internalReaders` | Undocumented
Instance Variable | `_justStopped` | A flag which is true between the time `reactor.stop` is called and the time the shutdown system event is fired. This is used to determine whether that event should be fired after each iteration through the mainloop...
Instance Variable | `_newTimedCalls` | Undocumented
Instance Variable | `_pendingTimedCalls` | Undocumented
Instance Variable | `_registerAsIOThread` | A flag controlling whether the reactor will register the thread it is running in as the I/O thread when it starts. If `True`, registration will be done, otherwise it will not be.
Instance Variable | `_signals` | An object which knows how to install and uninstall the reactor's signal-handling behavior.
Instance Variable | `_started` | A flag which is true from the time `reactor.run` is called until the time `reactor.run` returns. This is used to prevent calls to `reactor.run` on a running reactor. This should be replaced with an explicit state machine.
Instance Variable | `_startedBefore` | Undocumented
Instance Variable | `_stopped` | A flag which is true between paired calls to `reactor.run` and `reactor.stop`. This should be replaced with an explicit state machine.
Instance Variable | `_threadpoolStartupID` | Undocumented

Inherited from `PluggableResolverMixin` (via `_DisconnectSelectableMixin`, `ReactorBase`):

Method | `installNameResolver` | See `IReactorPluggableNameResolver`.
Method | `installResolver` | See `IReactorPluggableResolver`.
Instance Variable | `resolver` | The installed `IResolverSimple`.
Property | `nameResolver` | Implementation of read-only `IReactorPluggableNameResolver.nameResolver`.
Instance Variable | `_nameResolver` | The installed `IHostnameResolver`.

def adoptDatagramPort(self, fileDescriptor, addressFamily, protocol, maxPacketSize=8192): (source)
from `twisted.internet.interfaces.IReactorSocket`

Add an existing listening SOCK_DGRAM socket to the reactor to monitor for read and write readiness.

Parameters
fileDescriptor | A file descriptor associated with a socket which is already bound to an address and marked as listening. The socket must be set non-blocking. Any additional flags (for example, close-on-exec) must also be set by application code. Application code is responsible for closing the file descriptor, which may be done as soon as `adoptDatagramPort` returns.
addressFamily | The address family or domain of the socket. For example, `socket.AF_INET6`.
protocol | A `DatagramProtocol` instance to connect to a UDP transport.
maxPacketSize | The maximum packet size to accept.
Returns
An object providing `IListeningPort`.
Raises
`UnsupportedAddressFamily` | If the given address family is not supported by this reactor, or not supported with the given socket type.
`UnsupportedSocketType` | If the given socket type is not supported by this reactor, or not supported with the given socket type.

def adoptStreamConnection(self, fileDescriptor, addressFamily, factory): (source)
from `twisted.internet.interfaces.IReactorSocket`

See Also
`twisted.internet.interfaces.IReactorSocket.adoptStreamConnection`

def adoptStreamPort(self, fileDescriptor, addressFamily, factory): (source)
from `twisted.internet.interfaces.IReactorSocket`

Create a new `IListeningPort` from an already-initialized socket.

This just dispatches to a suitable port implementation (eg from `IReactorTCP`, etc) based on the specified `addressFamily`.

See Also
`twisted.internet.interfaces.IReactorSocket.adoptStreamPort`

def connectSSL(self, host, port, factory, contextFactory, timeout=30, bindAddress=None): (source)
from `twisted.internet.interfaces.IReactorSSL`

Connect a client Protocol to a remote SSL socket.

Parameters
host | a host name
port | a port number
factory | a `twisted.internet.protocol.ClientFactory` instance
contextFactory | a `twisted.internet.ssl.ClientContextFactory` object.
timeout | number of seconds to wait before assuming the connection has failed.
bindAddress | a (host, port) tuple of local address to bind to, or `None`.
Returns
An object which provides `IConnector`.

def connectTCP(self, host, port, factory, timeout=30, bindAddress=None): (source)
from `twisted.internet.interfaces.IReactorTCP`

Connect a TCP client.

Parameters
host | A hostname or an IPv4 or IPv6 address literal.
port | a port number
factory | a `twisted.internet.protocol.ClientFactory` instance
timeout | number of seconds to wait before assuming the connection has failed.
bindAddress | a (host, port) tuple of local address to bind to, or None.
Returns
An object which provides `IConnector`. This connector will call various callbacks on the factory when a connection is made, failed, or lost - see `ClientFactory` docs for details.

def connectUNIX(self, address, factory, timeout=30, checkPID=0): (source)
from `twisted.internet.interfaces.IReactorUNIX`

Connect a client protocol to a UNIX socket.

Parameters
address | a path to a unix socket on the filesystem.
factory | a `twisted.internet.protocol.ClientFactory` instance
timeout | number of seconds to wait before assuming the connection has failed.
checkPID | if True, check for a pid file to verify that a server is listening. If `address` is a Linux abstract namespace path, this must be `False`.
Returns
An object which provides `IConnector`.

def connectUNIXDatagram(self, address, protocol, maxPacketSize=8192, mode=438, bindAddress=None): (source)
from `twisted.internet.interfaces.IReactorUNIXDatagram`

Connects a `ConnectedDatagramProtocol` instance to a path.

EXPERIMENTAL.

def installWaker(self): (source)
overrides `twisted.internet.base.ReactorBase.installWaker`

Install a `waker' to allow threads and signals to wake up the IO thread.

We use the self-pipe trick (http://cr.yp.to/docs/selfpipe.html) to wake the reactor. On Windows we use a pair of sockets.

def listenMulticast(self, port, protocol, interface='', maxPacketSize=8192, listenMultiple=False): (source)
from `twisted.internet.interfaces.IReactorMulticast`

Connects a given DatagramProtocol to the given numeric UDP port.

EXPERIMENTAL.

Returns
object conforming to IListeningPort.

def listenSSL(self, port, factory, contextFactory, backlog=50, interface=''): (source)
from `twisted.internet.interfaces.IReactorSSL`

Connects a given protocol factory to the given numeric TCP/IP port. The connection is a SSL one, using contexts created by the context factory.

Parameters
port | a port number on which to listen
factory | a `twisted.internet.protocol.ServerFactory` instance
contextFactory | an implementor of `IOpenSSLContextFactory`
backlog | size of the listen queue
interface | the hostname to bind to, defaults to '' (all)

def listenTCP(self, port, factory, backlog=50, interface=''): (source)
from `twisted.internet.interfaces.IReactorTCP`

Connects a given protocol factory to the given numeric TCP/IP port.

Parameters
port | a port number on which to listen
factory | a `twisted.internet.protocol.ServerFactory` instance
backlog | size of the listen queue
interface | The local IPv4 or IPv6 address to which to bind; defaults to '', ie all IPv4 addresses. To bind to all IPv4 and IPv6 addresses, you must call this method twice.
Returns
an object that provides `IListeningPort`.
Raises
`CannotListenError` | as defined here `twisted.internet.error.CannotListenError`, if it cannot listen on this port (e.g., it cannot bind to the required port number)

def listenUDP(self, port, protocol, interface='', maxPacketSize=8192): (source)
from `twisted.internet.interfaces.IReactorUDP`

Connects a given `DatagramProtocol` to the given numeric UDP port.

Returns
object conforming to `IListeningPort`.

def listenUNIX(self, address, factory, backlog=50, mode=438, wantPID=0): (source)
from `twisted.internet.interfaces.IReactorUNIX`

Listen on a UNIX socket.

Parameters
address | a path to a unix socket on the filesystem.
factory | a `twisted.internet.protocol.Factory` instance.
backlog | number of connections to allow in backlog.
mode | The mode (not umask) to set on the unix socket. See platform specific documentation for information about how this might affect connection attempts.
wantPID | if True, create a pidfile for the socket. If `address` is a Linux abstract namespace path, this must be `False`.
Returns
An object which provides `IListeningPort`.

def listenUNIXDatagram(self, address, protocol, maxPacketSize=8192, mode=438): (source)
from `twisted.internet.interfaces.IReactorUNIXDatagram`

Connects a given `DatagramProtocol` to the given path.

EXPERIMENTAL.

Returns
object conforming to `IListeningPort`.

def spawnProcess(self, processProtocol, executable, args=(), env={}, path=None, uid=None, gid=None, usePTY=0, childFDs=None): (source)
from `twisted.internet.interfaces.IReactorProcess`

Spawn a process, with a process protocol.

Arguments given to this function that are listed as `bytes` or `unicode` may be encoded or decoded depending on the platform and the argument type given. On UNIX systems (Linux, FreeBSD, macOS) and Python 2 on Windows, `unicode` arguments will be encoded down to `bytes` using the encoding given by `sys.getfilesystemencoding`, to be used with the "narrow" OS APIs. On Python 3 on Windows, `bytes` arguments will be decoded up to `unicode` using the encoding given by `sys.getfilesystemencoding` (`utf8`) and given to Windows's native "wide" APIs.

Parameters
processProtocol | An object which will be notified of all events related to the created process.
executable | the file name to spawn - the full path should be used.
args | the command line arguments to pass to the process; a sequence of strings. The first string should be the executable's name.

env

the environment variables to pass to the child process. The resulting behavior varies between platforms. If:

- `env` is not set:
  - On POSIX: pass an empty environment.
  - On Windows: pass `os.environ`.
- `env` is `None`:
  - On POSIX: pass `os.environ`.
  - On Windows: pass `os.environ`.
- `env` is a `dict`:
  - On POSIX: pass the key/value pairs in `env` as the complete environment.
  - On Windows: update `os.environ` with the key/value pairs in the `dict` before passing it. As a consequence of bug #1640, passing keys with empty values in an effort to unset environment variables won't unset them.

path | the path to run the subprocess in - defaults to the current directory.
uid | user ID to run the subprocess as. (Only available on POSIX systems.)
gid | group ID to run the subprocess as. (Only available on POSIX systems.)
usePTY | if true, run this process in a pseudo-terminal. optionally a tuple of `(masterfd, slavefd, ttyname)`, in which case use those file descriptors. (Not available on all systems.)

childFDs

A dictionary mapping file descriptors in the new child process to an integer or to the string 'r' or 'w'.

If the value is an integer, it specifies a file descriptor in the parent process which will be mapped to a file descriptor (specified by the key) in the child process. This is useful for things like inetd and shell-like file redirection.

If it is the string 'r', a pipe will be created and attached to the child at that file descriptor: the child will be able to write to that file descriptor and the parent will receive read notification via the `IProcessProtocol.childDataReceived` callback. This is useful for the child's stdout and stderr.

If it is the string 'w', similar setup to the previous case will occur, with the pipe being readable by the child instead of writeable. The parent process can write to that file descriptor using `IProcessTransport.writeToChild`. This is useful for the child's stdin.

If childFDs is not passed, the default behaviour is to use a mapping that opens the usual stdin/stdout/stderr pipes.

Returns
An object which provides `IProcessTransport`.
Raises
`OSError` | Raised with errno `EAGAIN` or `ENOMEM` if there are insufficient system resources to create a new process.
See Also
`twisted.internet.protocol.ProcessProtocol`

waker = (source)
overrides `twisted.internet.base.ReactorBase.waker`

Undocumented

def _removeAll(self, readers, writers): (source)

Remove all readers and writers, and list of removed `IReadDescriptor`s and `IWriteDescriptor`s.

Meant for calling from subclasses, to implement removeAll, like:

      def removeAll(self):
          return self._removeAll(self._reads, self._writes)

where `self._reads` and `self._writes` are iterables.

def _signalsFactory(self) -> `SignalHandling`: (source)
overrides `twisted.internet.base.ReactorBase._signalsFactory`

Customize reactor signal handling to support child processes on POSIX platforms.

def _wakerFactory(self) -> `_IWaker`: (source)
overridden in `twisted.internet._glibbase.GlibReactorBase`, `twisted.internet.cfreactor.CFReactor`

Undocumented

_supportedAddressFamilies: `Sequence[socket.AddressFamily]` = (source)

Undocumented

_childWaker = (source)

`None` or a reference to the `_SIGCHLDWaker` which is used to properly notice child process termination.