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__pycache__ dir drwxr-xr-x 2024-10-07 16:37 R D
  __init__.py 1.402 KB -rw-r--r-- 2018-12-23 21:37 R E G D
  base_events.py 56.002 KB -rw-r--r-- 2018-12-23 21:37 R E G D
  base_futures.py 2.025 KB -rw-r--r-- 2018-12-23 21:37 R E G D
  base_subprocess.py 8.883 KB -rw-r--r-- 2018-12-23 21:37 R E G D
  base_tasks.py 2.135 KB -rw-r--r-- 2018-12-23 21:37 R E G D
  compat.py 0.53 KB -rw-r--r-- 2018-12-23 21:37 R E G D
  constants.py 0.362 KB -rw-r--r-- 2018-12-23 21:37 R E G D
  coroutines.py 10.874 KB -rw-r--r-- 2018-12-23 21:37 R E G D
  events.py 22.96 KB -rw-r--r-- 2018-12-23 21:37 R E G D
  futures.py 15.528 KB -rw-r--r-- 2018-12-23 21:37 R E G D
  locks.py 15.217 KB -rw-r--r-- 2018-12-23 21:37 R E G D
  log.py 0.121 KB -rw-r--r-- 2018-12-23 21:37 R E G D
  proactor_events.py 19.925 KB -rw-r--r-- 2018-12-23 21:37 R E G D
  protocols.py 4.406 KB -rw-r--r-- 2018-12-23 21:37 R E G D
  queues.py 7.771 KB -rw-r--r-- 2018-12-23 21:37 R E G D
  selector_events.py 40.664 KB -rw-r--r-- 2018-12-23 21:37 R E G D
  sslproto.py 25.396 KB -rw-r--r-- 2018-12-23 21:37 R E G D
  streams.py 23.898 KB -rw-r--r-- 2018-12-23 21:37 R E G D
  subprocess.py 7.447 KB -rw-r--r-- 2018-12-23 21:37 R E G D
  tasks.py 24.473 KB -rw-r--r-- 2018-12-23 21:37 R E G D
  test_utils.py 14.737 KB -rw-r--r-- 2018-12-23 21:37 R E G D
  transports.py 9.83 KB -rw-r--r-- 2018-12-23 21:37 R E G D
  unix_events.py 36.395 KB -rw-r--r-- 2018-12-23 21:37 R E G D
  windows_events.py 27.179 KB -rw-r--r-- 2018-12-23 21:37 R E G D
  windows_utils.py 6.722 KB -rw-r--r-- 2018-12-23 21:37 R E G D
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"""Selector event loop for Unix with signal handling.""" import errno import os import signal import socket import stat import subprocess import sys import threading import warnings from . import base_events from . import base_subprocess from . import compat from . import constants from . import coroutines from . import events from . import futures from . import selector_events from . import selectors from . import transports from .coroutines import coroutine from .log import logger __all__ = ['SelectorEventLoop', 'AbstractChildWatcher', 'SafeChildWatcher', 'FastChildWatcher', 'DefaultEventLoopPolicy', ] if sys.platform == 'win32': # pragma: no cover raise ImportError('Signals are not really supported on Windows') def _sighandler_noop(signum, frame): """Dummy signal handler.""" pass try: _fspath = os.fspath except AttributeError: # Python 3.5 or earlier _fspath = lambda path: path class _UnixSelectorEventLoop(selector_events.BaseSelectorEventLoop): """Unix event loop. Adds signal handling and UNIX Domain Socket support to SelectorEventLoop. """ def __init__(self, selector=None): super().__init__(selector) self._signal_handlers = {} def _socketpair(self): return socket.socketpair() def close(self): super().close() if not sys.is_finalizing(): for sig in list(self._signal_handlers): self.remove_signal_handler(sig) else: if self._signal_handlers: warnings.warn(f"Closing the loop {self!r} " f"on interpreter shutdown " f"stage, skipping signal handlers removal", ResourceWarning, source=self) self._signal_handlers.clear() def _process_self_data(self, data): for signum in data: if not signum: # ignore null bytes written by _write_to_self() continue self._handle_signal(signum) def add_signal_handler(self, sig, callback, *args): """Add a handler for a signal. UNIX only. Raise ValueError if the signal number is invalid or uncatchable. Raise RuntimeError if there is a problem setting up the handler. """ if (coroutines.iscoroutine(callback) or coroutines.iscoroutinefunction(callback)): raise TypeError("coroutines cannot be used " "with add_signal_handler()") self._check_signal(sig) self._check_closed() try: # set_wakeup_fd() raises ValueError if this is not the # main thread. By calling it early we ensure that an # event loop running in another thread cannot add a signal # handler. signal.set_wakeup_fd(self._csock.fileno()) except (ValueError, OSError) as exc: raise RuntimeError(str(exc)) handle = events.Handle(callback, args, self) self._signal_handlers[sig] = handle try: # Register a dummy signal handler to ask Python to write the signal # number in the wakup file descriptor. _process_self_data() will # read signal numbers from this file descriptor to handle signals. signal.signal(sig, _sighandler_noop) # Set SA_RESTART to limit EINTR occurrences. signal.siginterrupt(sig, False) except OSError as exc: del self._signal_handlers[sig] if not self._signal_handlers: try: signal.set_wakeup_fd(-1) except (ValueError, OSError) as nexc: logger.info('set_wakeup_fd(-1) failed: %s', nexc) if exc.errno == errno.EINVAL: raise RuntimeError('sig {} cannot be caught'.format(sig)) else: raise def _handle_signal(self, sig): """Internal helper that is the actual signal handler.""" handle = self._signal_handlers.get(sig) if handle is None: return # Assume it's some race condition. if handle._cancelled: self.remove_signal_handler(sig) # Remove it properly. else: self._add_callback_signalsafe(handle) def remove_signal_handler(self, sig): """Remove a handler for a signal. UNIX only. Return True if a signal handler was removed, False if not. """ self._check_signal(sig) try: del self._signal_handlers[sig] except KeyError: return False if sig == signal.SIGINT: handler = signal.default_int_handler else: handler = signal.SIG_DFL try: signal.signal(sig, handler) except OSError as exc: if exc.errno == errno.EINVAL: raise RuntimeError('sig {} cannot be caught'.format(sig)) else: raise if not self._signal_handlers: try: signal.set_wakeup_fd(-1) except (ValueError, OSError) as exc: logger.info('set_wakeup_fd(-1) failed: %s', exc) return True def _check_signal(self, sig): """Internal helper to validate a signal. Raise ValueError if the signal number is invalid or uncatchable. Raise RuntimeError if there is a problem setting up the ha