WindowsError:[错误 5] 尝试终止子进程时拒绝访问(python)

本文介绍了WindowsError:[错误 5] 尝试终止子进程时拒绝访问(python)的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

所以我有一个 python 脚本，它运行一个循环，它通过子进程调用程序 A.Popen 等待它的输出，然后保存输出，然后再次调用它，依此类推.(这在我设置为输入的多次运行中不断发生)

So I have a python script that runs a loop in which it calls a program A through subprocess.Popen waits for its output, then saves the output and then calls it again and so on. (This keeps happening for a number of runs I set as an input)

问题是我有一个计时器，这样每当程序 A 花费的时间超过特定的阈值时间时，脚本就会使用 process.kill() 终止进程并继续进行下一次迭代.

The thing is that I have a timer so that whenever the program A takes more than a particular threshold_time, the script kills the process with process.kill() and moves on to the next iteration.

问题是，即使运行 300 次似乎一切正常，但有时我会收到此错误:

The problem is that even though everything seems to work fine even for 300 runs, sometimes I get this error:

File "C:Python27libsubprocess.py", line 1002, in terminate _subprocess.TerminateProcess(self._handle, 1) WindowsError: [Error 5] Access is denied

然后脚本就死掉了.

引用的脚本部分:

timeout = TIME_CONST for run in runs: killed = False start = time.clock() p = subprocess.Popen("SOME.CMD", cwd=r"some_dir") # Monitor process. If it hits threshold, kill it and go to the next run while p.poll() is None: time.sleep(20) secs_passed = time.clock() - start ### the following was my initial buggy line ### #if secs_passed >= timeout: ### corrected line after jedislight's answer ### #if the time is over the threshold and process is still running, kill it if secs_passed >= timeout and p.poll is None: p.kill() killed = True break if killed: continue

您对可能出现的问题有什么建议吗?

Do you have any suggestions what the problem might be?

接受答案并修复了代码.感谢@jedislight 的反馈！

Accepted answer and fixed the code. Thanks @jedislight for your feedback!

推荐答案

您将 p.poll() 和 p.kill() 分开 20 秒.到那时，该过程可能已经完成.我建议移动 time.sleep(20) 调用，以便您在同一时间范围内轮询和杀死，以避免杀死一个死进程.下面是一个在 iPython 中运行的示例，在终止已完成的进程时显示了类似的错误:

You are seperating your p.poll() and your p.kill() by 20 seconds. By then the process could have finished. I would suggest moving the time.sleep(20) call around so that you poll and kill happen in the same time frame, to avoid killing a dead process. Below is an example run in iPython showing a similar error when killing a completed process:

In [2]: import subprocess In [3]: p = subprocess.Popen("dir") In [4]: p.poll() Out[4]: 0 In [5]: p.kill() --------------------------------------------------------------------------- WindowsError Traceback (most recent call last) C:Users---<ipython console> in <module>() C:Python26libsubprocess.pyc in terminate(self) 947 """Terminates the process 948 """ --> 949 _subprocess.TerminateProcess(self._handle, 1) 950 951 kill = terminate WindowsError: [Error 5] Access is denied

即使您在显示进程正在运行的轮询后直接终止，它也可以在执行下一行之前完成.我还建议为此异常添加一个 try-catch 块，如果它发生再次轮询以查看该过程是否实际完成.

Even if you kill directly after a poll that shows the processes is running it can finish before the next line is executed. I would also suggest adding a try-catch block for this exception and if it occurs poll again to see if the process actually completed.