关闭python后让进程继续运行 [英] Leave a process running after closing python

问题描述

我希望在终止原始进程后让进程继续运行.

I'm looking to leave a process running after terminating the original process.

以下代码在杀死原件后不会保持其进程运行.

The following code will not keep it's process running after killing the original.

args = ['yes']
Popen(args, shell=True, stdout=None, stdin=None, stderror=None)

我已经尝试了我能想到的所有方法，我使用了 os.spawn() 的变体，但无法让它们保持打开状态.

I've tried everything I can think of, I've used variations of os.spawn() and could not get them to stay open.

似乎向子进程发送了键盘中断(命令是).

It seems to send a keyboard interrupt to the child process(the command yes).

推荐答案

问题是，即使您的子进程无法通过标准流访问控制台，它仍然有一个控制终端em>;进程可以从其控制终端接收诸如 TSTP (stop, ^Z) 和 INT (^C) 之类的信号.因此，您想要的是将进程与控制终端和整个会话分离.执行此操作后，您将拥有一个适当的守护进程.

The problem is that even though your subprocess doesn't have access to the console via the standard streams, it will still have a controlling terminal; a process can receive signals such as TSTP (stop, ^Z) and INT (^C) from its controlling terminal. Therefore what you want to have is to detach the process from the controlling terminal and the entire session. When you do this, you'll have a proper daemon process.

在 C 世界和 Python 2 中，您可以通过调用 setsid 来实现这一点 在 child 进程中，这将为子进程创建一个新会话.此外，新会话将没有控制终端.

In C world and in Python 2 you can achieve this by calling setsid in the child process, which will create a new session for the child process. Additionally the new session will not have a controlling terminal.

在 Python 3.2+ 中，这更容易 - 只需将 start_new_session=True 传入 Popen:

In Python 3.2+ this is even easier - just pass in start_new_session=True to the Popen:

如果 start_new_session 为真，setsid() 系统调用将在子进程执行之前在子进程中进行.(仅限 POSIX)

If start_new_session is true the setsid() system call will be made in the child process prior to the execution of the subprocess. (POSIX only)

在 3.2 版中更改:添加了 start_new_session.

Changed in version 3.2: start_new_session was added.

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