Python signal.SIGCHLD属性代码示例

# 需要导入模块: import signal [as 别名]
# 或者: from signal import SIGCHLD [as 别名]
def set_exit_callback(self, callback):
        """Runs ``callback`` when this process exits.

        The callback takes one argument, the return code of the process.

        This method uses a ``SIGCHLD`` handler, which is a global setting
        and may conflict if you have other libraries trying to handle the
        same signal.  If you are using more than one ``IOLoop`` it may
        be necessary to call `Subprocess.initialize` first to designate
        one ``IOLoop`` to run the signal handlers.

        In many cases a close callback on the stdout or stderr streams
        can be used as an alternative to an exit callback if the
        signal handler is causing a problem.
        """
        self._exit_callback = stack_context.wrap(callback)
        Subprocess.initialize(self.io_loop)
        Subprocess._waiting[self.pid] = self
        Subprocess._try_cleanup_process(self.pid) 

# 需要导入模块: import signal [as 别名]
# 或者: from signal import SIGCHLD [as 别名]
def initialize(cls, io_loop=None):
        """Initializes the ``SIGCHLD`` handler.

        The signal handler is run on an `.IOLoop` to avoid locking issues.
        Note that the `.IOLoop` used for signal handling need not be the
        same one used by individual Subprocess objects (as long as the
        ``IOLoops`` are each running in separate threads).

        .. versionchanged:: 4.1
           The ``io_loop`` argument is deprecated.
        """
        if cls._initialized:
            return
        if io_loop is None:
            io_loop = ioloop.IOLoop.current()
        cls._old_sigchld = signal.signal(
            signal.SIGCHLD,
            lambda sig, frame: io_loop.add_callback_from_signal(cls._cleanup))
        cls._initialized = True 

# 需要导入模块: import signal [as 别名]
# 或者: from signal import SIGCHLD [as 别名]
def wait_for_child_and_forward_signals(child_pid, process_name):
    """Wait for a child to terminate and in the meantime forward all signals
    that the current process receives to this child.
    @return a tuple of exit code and resource usage of the child as given by os.waitpid
    """
    block_all_signals()

    while True:
        logging.debug("Waiting for signals")
        signum = signal.sigwait(_ALL_SIGNALS)
        if signum == signal.SIGCHLD:
            pid, exitcode, ru_child = os.wait4(-1, os.WNOHANG)
            while pid != 0:
                if pid == child_pid:
                    return exitcode, ru_child
                else:
                    logging.debug("Received unexpected SIGCHLD for PID %s", pid)
                pid, exitcode, ru_child = os.wait4(-1, os.WNOHANG)

        else:
            _forward_signal(signum, child_pid, process_name) 

# 需要导入模块: import signal [as 别名]
# 或者: from signal import SIGCHLD [as 别名]
def set_exit_callback(self, callback: Callable[[int], None]) -> None:
        """Runs ``callback`` when this process exits.

        The callback takes one argument, the return code of the process.

        This method uses a ``SIGCHLD`` handler, which is a global setting
        and may conflict if you have other libraries trying to handle the
        same signal.  If you are using more than one ``IOLoop`` it may
        be necessary to call `Subprocess.initialize` first to designate
        one ``IOLoop`` to run the signal handlers.

        In many cases a close callback on the stdout or stderr streams
        can be used as an alternative to an exit callback if the
        signal handler is causing a problem.

        Availability: Unix
        """
        self._exit_callback = callback
        Subprocess.initialize()
        Subprocess._waiting[self.pid] = self
        Subprocess._try_cleanup_process(self.pid) 

# 需要导入模块: import signal [as 别名]
# 或者: from signal import SIGCHLD [as 别名]
def initialize(cls) -> None:
        """Initializes the ``SIGCHLD`` handler.

        The signal handler is run on an `.IOLoop` to avoid locking issues.
        Note that the `.IOLoop` used for signal handling need not be the
        same one used by individual Subprocess objects (as long as the
        ``IOLoops`` are each running in separate threads).

        .. versionchanged:: 5.0
           The ``io_loop`` argument (deprecated since version 4.1) has been
           removed.

        Availability: Unix
        """
        if cls._initialized:
            return
        io_loop = ioloop.IOLoop.current()
        cls._old_sigchld = signal.signal(
            signal.SIGCHLD,
            lambda sig, frame: io_loop.add_callback_from_signal(cls._cleanup),
        )
        cls._initialized = True 

# 需要导入模块: import signal [as 别名]
# 或者: from signal import SIGCHLD [as 别名]
def initialize(cls, io_loop=None):
        """Initializes the ``SIGCHILD`` handler.

        The signal handler is run on an `.IOLoop` to avoid locking issues.
        Note that the `.IOLoop` used for signal handling need not be the
        same one used by individual Subprocess objects (as long as the
        ``IOLoops`` are each running in separate threads).
        """
        if cls._initialized:
            return
        if io_loop is None:
            io_loop = ioloop.IOLoop.current()
        cls._old_sigchld = signal.signal(
            signal.SIGCHLD,
            lambda sig, frame: io_loop.add_callback_from_signal(cls._cleanup))
        cls._initialized = True 

# 需要导入模块: import signal [as 别名]
# 或者: from signal import SIGCHLD [as 别名]
def __init__(self):
        # Setup signal fd, this allows signal to behave correctly
        if os.name == 'posix':
            self.signal_pipe_r, self.signal_pipe_w = os.pipe()
            self._set_nonblock(self.signal_pipe_r)
            self._set_nonblock(self.signal_pipe_w)
            signal.set_wakeup_fd(self.signal_pipe_w)

        self._signals_received = collections.deque()

        signal.signal(signal.SIGINT, signal.SIG_DFL)
        if os.name == 'posix':
            signal.signal(signal.SIGCHLD, signal.SIG_DFL)
            signal.signal(signal.SIGTERM, self._signal_catcher)
            signal.signal(signal.SIGALRM, self._signal_catcher)
            signal.signal(signal.SIGHUP, self._signal_catcher)
        else:
            # currently a noop on window...
            signal.signal(signal.SIGTERM, self._signal_catcher)
            # FIXME(sileht): should allow to catch signal CTRL_BREAK_EVENT,
            # but we to create the child process with CREATE_NEW_PROCESS_GROUP
            # to make this work, so current this is a noop for later fix
            signal.signal(signal.SIGBREAK, self._signal_catcher) 

# 需要导入模块: import signal [as 别名]
# 或者: from signal import SIGCHLD [as 别名]
def setUp(self):
        """
        Save the current SIGCHLD handler as reported by L{signal.signal} and
        the current file descriptor registered with L{installHandler}.
        """
        handler = signal.getsignal(signal.SIGCHLD)
        if handler != signal.SIG_DFL:
            self.signalModuleHandler = handler
            signal.signal(signal.SIGCHLD, signal.SIG_DFL)
        else:
            self.signalModuleHandler = None

        self.oldFD = installHandler(-1)

        if self.signalModuleHandler is not None and self.oldFD != -1:
            msg("Previous test didn't clean up after its SIGCHLD setup: %r %r"
                % (self.signalModuleHandler, self.oldFD)) 

# 需要导入模块: import signal [as 别名]
# 或者: from signal import SIGCHLD [as 别名]
def set_exit_callback(self, callback):
        """Runs ``callback`` when this process exits.

        The callback takes one argument, the return code of the process.

        This method uses a ``SIGCHLD`` handler, which is a global setting
        and may conflict if you have other libraries trying to handle the
        same signal.  If you are using more than one ``IOLoop`` it may
        be necessary to call `Subprocess.initialize` first to designate
        one ``IOLoop`` to run the signal handlers.

        In many cases a close callback on the stdout or stderr streams
        can be used as an alternative to an exit callback if the
        signal handler is causing a problem.
        """
        self._exit_callback = stack_context.wrap(callback)
        Subprocess.initialize()
        Subprocess._waiting[self.pid] = self
        Subprocess._try_cleanup_process(self.pid) 

# 需要导入模块: import signal [as 别名]
# 或者: from signal import SIGCHLD [as 别名]
def initialize(cls):
        """Initializes the ``SIGCHLD`` handler.

        The signal handler is run on an `.IOLoop` to avoid locking issues.
        Note that the `.IOLoop` used for signal handling need not be the
        same one used by individual Subprocess objects (as long as the
        ``IOLoops`` are each running in separate threads).

        .. versionchanged:: 5.0
           The ``io_loop`` argument (deprecated since version 4.1) has been
           removed.
        """
        if cls._initialized:
            return
        io_loop = ioloop.IOLoop.current()
        cls._old_sigchld = signal.signal(
            signal.SIGCHLD,
            lambda sig, frame: io_loop.add_callback_from_signal(cls._cleanup))
        cls._initialized = True 

# 需要导入模块: import signal [as 别名]
# 或者: from signal import SIGCHLD [as 别名]
def set_exit_callback(self, callback: Callable[[int], None]) -> None:
        """Runs ``callback`` when this process exits.

        The callback takes one argument, the return code of the process.

        This method uses a ``SIGCHLD`` handler, which is a global setting
        and may conflict if you have other libraries trying to handle the
        same signal.  If you are using more than one ``IOLoop`` it may
        be necessary to call `Subprocess.initialize` first to designate
        one ``IOLoop`` to run the signal handlers.

        In many cases a close callback on the stdout or stderr streams
        can be used as an alternative to an exit callback if the
        signal handler is causing a problem.
        """
        self._exit_callback = callback
        Subprocess.initialize()
        Subprocess._waiting[self.pid] = self
        Subprocess._try_cleanup_process(self.pid) 

# 需要导入模块: import signal [as 别名]
# 或者: from signal import SIGCHLD [as 别名]
def initialize(cls) -> None:
        """Initializes the ``SIGCHLD`` handler.

        The signal handler is run on an `.IOLoop` to avoid locking issues.
        Note that the `.IOLoop` used for signal handling need not be the
        same one used by individual Subprocess objects (as long as the
        ``IOLoops`` are each running in separate threads).

        .. versionchanged:: 5.0
           The ``io_loop`` argument (deprecated since version 4.1) has been
           removed.
        """
        if cls._initialized:
            return
        io_loop = ioloop.IOLoop.current()
        cls._old_sigchld = signal.signal(
            signal.SIGCHLD,
            lambda sig, frame: io_loop.add_callback_from_signal(cls._cleanup),
        )
        cls._initialized = True 

# 需要导入模块: import signal [as 别名]
# 或者: from signal import SIGCHLD [as 别名]
def clone(self, proc=None):
        """clone([proc]) clones the supplied process object and manages it as
        well. If no process object is supplied then clone the first managed
        process found in this ProcManager.
        """
        if proc is None: # default to cloning first process found.
            procs = self._procs.values()
            if procs:
                proc = procs[0]
                del procs
            else:
                return
        signal.signal(SIGCHLD, SIG_DFL) # critical area
        newproc = proc.clone()
        self._procs[newproc.childpid] = newproc
        signal.signal(SIGCHLD, self._child_handler)
        signal.siginterrupt(SIGCHLD, False)
        return newproc 

# 需要导入模块: import signal [as 别名]
# 或者: from signal import SIGCHLD [as 别名]
def get_usage():
    # This function only works if you have a signal handler for the
    # signal.SIGCHLD signal.
    raw_usage = resource.getrusage(resource.RUSAGE_CHILDREN)
    # 0   ru_utime    time in user mode (float)
    # 1   ru_stime    time in system mode (float)
    # 2   ru_maxrss   maximum resident set size
    #
    # These fields are always zero on Linux
    # 3   ru_ixrss    shared memory size
    # 4   ru_idrss    unshared memory size
    # 5   ru_isrss    unshared stack size
    return "User:{}s System:{}s".format(
        int(raw_usage.ru_utime),
        int(raw_usage.ru_stime),
    ) 

# 需要导入模块: import signal [as 别名]
# 或者: from signal import SIGCHLD [as 别名]
def attach_loop(self, loop):
        assert loop is None or isinstance(loop, events.AbstractEventLoop)

        if self._loop is not None and loop is None and self._callbacks:
            warnings.warn(
                'A loop is being detached '
                'from a child watcher with pending handlers',
                RuntimeWarning)

        if self._loop is not None:
            self._loop.remove_signal_handler(signal.SIGCHLD)

        self._loop = loop
        if loop is not None:
            loop.add_signal_handler(signal.SIGCHLD, self._sig_chld)

            # Prevent a race condition in case a child terminated
            # during the switch.
            self._do_waitpid_all()