如何停止将SIGINT传递给python中的子进程? [英] How to stop SIGINT being passed to subprocess in python?

问题描述

我的python脚本使用信号 process 模块拦截SIGINT信号，以防止过早退出，但是此信号传递给我用Popen打开的子进程.有什么方法可以防止将此信号传递给子进程，以便在用户按下ctrl-c时也不会过早退出该信号?

My python script intercepts the SIGINT signal with the signal process module to prevent premature exit, but this signal is passed to a subprocess that I open with Popen. is there some way to prevent passing this signal to the subprocess so that it also is not exited prematurely when the user presses ctrl-c?

推荐答案

您可以使用

You are able to re-assign the role of ctrl-c using the tty module, which allows you to manipulate the assignment of signals. Be warned, however, that unless you put them back the way they were before you modified them, they will persist for the shell's entire session, even after the program exits.

这是一个入门的简单代码段，该代码段存储旧的tty设置，将ctrl-c重新分配给ctrl-x，然后在退出时恢复以前的tty设置.

Here is a simple code snippet to get you started that stores your old tty settings, re-assigns ctrl-c to ctrl-x, and then restores your previous tty settings upon exit.

import sys
import tty

# Back up previous tty settings
stdin_fileno = sys.stdin.fileno()
old_ttyattr = tty.tcgetattr(stdin_fileno)

try:
    print 'Reassigning ctrl-c to ctrl-x'

    # Enter raw mode on local tty
    tty.setraw(stdin_fileno)
    raw_ta = tty.tcgetattr(stdin_fileno)
    raw_ta[tty.LFLAG] |= tty.ISIG
    raw_ta[tty.OFLAG] |= tty.OPOST | tty.ONLCR

    # ^X is the new ^C, set this to 0 to disable it entirely
    raw_ta[tty.CC][tty.VINTR] = '\x18'  

    # Set raw tty as active tty
    tty.tcsetattr(stdin_fileno, tty.TCSANOW, raw_ta)

    # Dummy program loop
    import time
    for _ in range(5):
        print 'doing stuff'
        time.sleep(1)

finally:
    print 'Resetting ctrl-c'
    # Restore previous tty no matter what
    tty.tcsetattr(stdin_fileno, tty.TCSANOW, old_ttyattr)

这篇关于如何停止将SIGINT传递给python中的子进程?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！