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If any of the hooks passed a 'cancel' function to add_hook(), then those functions will be called, allowing them to free resources, etc. Following a fork, one of the resulting processes can call this function to allow it to terminate without calling the hooks registered before calling this function. New hooks registered after calling this function will take effect normally.""" global _hooks for hook, cancel, run_at_exit in _hooks: if cancel: cancel() _hooks = [] _added_hook = False _files = {} def add_file_to_unlink(file): """Registers 'file' to be unlinked when the program terminates via sys.exit() or a fatal signal.""" global _added_hook if not _added_hook: _added_hook = True add_hook(_unlink_files, _cancel_files, True) _files[file] = None def add_file_to_close_and_unlink(file, fd=None): """Registers 'file' to be unlinked when the program terminates via sys.exit() or a fatal signal and the 'fd' to be closed. On Windows a file cannot be removed while it is open for writing.""" global _added_hook if not _added_hook: _added_hook = True add_hook(_unlink_files, _cancel_files, True) _files[file] = fd def remove_file_to_unlink(file): """Unregisters 'file' from being unlinked when the program terminates via sys.exit() or a fatal signal.""" if file in _files: del _files[file] def unlink_file_now(file): """Like fatal_signal_remove_file_to_unlink(), but also unlinks 'file'. Returns 0 if successful, otherwise a positive errno value.""" error = _unlink(file) if error: vlog.warn("could not unlink \"%s\" (%s)" % (file, os.strerror(error))) remove_file_to_unlink(file) return error def _unlink_files(): for file_ in _files: if sys.platform == "win32" and _files[file_]: _files[file_].close() _unlink(file_) def _cancel_files(): global _added_hook global _files _added_hook = False _files = {} def _unlink(file_): try: os.unlink(file_) return 0 except OSError as e: return e.errno def _signal_handler(signr, _): _call_hooks(signr) # Re-raise the signal with the default handling so that the program # termination status reflects that we were killed by this signal. signal.signal(signr, signal.SIG_DFL) os.kill(os.getpid(), signr) def _atexit_handler(): _call_hooks(0) recurse = False def _call_hooks(signr): global recurse if recurse: return recurse = True for hook, cancel, run_at_exit in _hooks: if signr != 0 or run_at_exit: hook() _inited = False def _init(): global _inited if not _inited: _inited = True if sys.platform == "win32": signals = [signal.SIGTERM, signal.SIGINT] else: signals = [signal.SIGTERM, signal.SIGINT, signal.SIGHUP, signal.SIGALRM] for signr in signals: if signal.getsignal(signr) == signal.SIG_DFL: signal.signal(signr, _signal_handler) atexit.register(_atexit_handler) def signal_alarm(timeout): if not timeout: env_timeout = os.environ.get('OVS_CTL_TIMEOUT') if env_timeout: timeout = int(env_timeout) if not timeout: return if sys.platform == "win32": import time import threading class Alarm (threading.Thread): def __init__(self, timeout): super(Alarm, self).__init__() self.timeout = timeout self.setDaemon(True) def run(self): time.sleep(self.timeout) os._exit(1) alarm = Alarm(timeout) alarm.start() else: signal.alarm(timeout)