OSError：[Errno 1] 不允许操作 - Python答案

【问题标题】：OSError: [Errno 1] Operation not permitted - PythonOSError：[Errno 1] 不允许操作 - Python
【发布时间】：2015-12-17 18:04:20
【问题描述】：

我有一个使用命令行启动 Ruby on Rails 服务器的自动化工具：

from subprocess import Popen
devnull = open(os.devnull, 'r+')
self.webserver = Popen(server_cmd, shell=True, stdin=devnull, stdout=devnull,
                       stderr=devnull, close_fds=True, preexec_fn=os.setsid)

网络服务器是一个包含作为单独进程运行的服务器的进程（它应该是这样的）。所以我有stop_webserver 方法来杀死进程并停止Rails 服务器：

def stop_webserver(self):
    """
    Stop the Rails server, if there is one running or it was created.
    Kill the process and all of its children, in order to avoid having a
    zoombie processes.
    """
    if self.webserver is None:
        self.log.info("Server isn't running. Nothing to do.")
        return

    if self.is_server_running():
        # os.killpg(self.webserver.pid, signal.SIGTERM)
        self.log.info("PID: %s" % self.webserver.pid)
        # self.log.info("PID: %s" % os.getpgid(self.webserver.pid))
        time.sleep(10)
        os.killpg(self.webserver.pid, signal.SIGKILL)
        self.webserver = None
        self.log.info("Server was stopped.")

但是我总是收到以下错误：

Traceback (most recent call last):
  File "unit/front_end_test.py", line 27, in runTest
    frontend.stop_webserver()
  File "front_end.py", line 184, in stop_webserver
    os.killpg(self.webserver.pid, signal.SIGKILL)
OSError: [Errno 1] Operation not permitted

如果我尝试使用 os.getpgid 终止进程，我会收到不同的错误：

Traceback (most recent call last):
  File "unit/front_end_test.py", line 27, in runTest
    frontend.stop_webserver()
  File "front_end.py", line 182, in stop_webserver
    self.log.info("PID: %s" % os.getpgid(self.webserver.pid))
OSError: [Errno 3] No such process

但是，服务器仍在端口 3001 上运行。该进程从未被终止。如何正确终止进程？

【问题讨论】：

标签： ruby process operating-system multiprocessing signals

【解决方案1】：

我通过强制os.system() kill 解决了这个问题：

def stop_webserver(self):
    """
    Stop the Rails server, if there is one running or it was created.
    Kill the process and all of its children, in order to avoid having a
    zoombie processes.
    """
    if self.webserver is None:
        self.log.info("Server isn't running. Nothing to do.")
        return

    if self.is_server_running():
        try:
            # os.killpg(self.webserver.pid, signal.SIGKILL)
            os.killpg(self.webserver.pid, signal.SIGTERM)
            self.webserver = None
            self.log.info("Server was stopped.")
        except OSError, e:
            self.log.exception(e)
            self.log.info("PID: %s" % self.webserver.pid)
            os.system("sudo kill %s" % (self.webserver.pid, ))

【讨论】：