如何通过脚本的树状传播的信号？巴什 [英] How to propagate a signal through an arborescence of scripts ? Bash

问题描述

我有一个由一主一控制脚本的树状

I have an arborescence of scripts which are controlled by a main one

我想陷阱主脚本信号 CTRL-C ，并将其传播到其他

I want to trap the signal ctrl-c in the main script and propagate it to the others

其他脚本应该捕获这个信号，以及（从主脚本），并做一些清理...

The other scripts should trap this signal as well ( from the main script ) and do some clean-up ...

我试图发送杀-s SIGINT 来的孩子，但他们似乎他们无法
捕捉信号（即使陷阱'清理'SIGINT 对孩子的脚本所定义）

I have tried to send kill -s SIGINT to the children, but they seem they are unable to catch the signal( even if trap 'Cleanup' SIGINT being defined on the children scripts )

任何线索如何实现这一点？

Any clues how to realize this ?

问候，

调试

推荐答案

下面的示例演示，做父母的脚本的东西（睡眠5 ）启动两个孩子后做自己的事情（也睡眠5 ）。当父退出（无论何种原因），它标志着孩子终止（不要 SIGINT ，终止是由 SIGTERM ，也是默认杀信号）。孩子们接着做 SIGTERM 接收他们的事。如果孩子是自己的脚本，我建议你改变的陷阱 - TERM 掉进陷阱的退出使孩子们收拾不管他们终止的原因是什么（只要它捕获的）。

The following example demonstrates a parent script that does something (sleep 5) after it starts two children that do their own thing (also sleep 5). When the parent exits (for whatever reason) it signals the children to terminate (don't SIGINT, termination is signaled by SIGTERM, also the default kill signal). The children then do their thing on reception of SIGTERM. If the children are scripts of their own, I recommend you change the trap on TERM into a trap on EXIT so that the children clean up no matter what the cause of their termination be (so long as it's trappable).

请注意我用的等待。击不中断运行的非内置命令，当它接收到信号。相反，它会等待他们完成且命令完成后处理的信号。如果你使用等，bash将立即停止等待并处理信号的时候了。

Notice my use of wait. Bash does not interrupt running non-builtin commands when it receives a signal. Instead, it waits for them to complete and handles the signal after the command is done. If you use wait, bash stops waiting immediately and handles the signal right away.

#!/usr/bin/env bash

trap 'echo parent shutting down; kill $(jobs -p)' EXIT

{ trap 'echo child 1 signaled' TERM; sleep 5 & wait; } &
{ trap 'echo child 2 signaled' TERM; sleep 5 & wait; } &

sleep 5

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