子后台进程中的陷阱信号

问题描述

在子进程/后台进程中运行时，我无法捕获信号.

I am unable to trap a signal when running in a child / background process.

这是我简单的bash脚本:

Here is my simple bash script :

#!/bin/bash

echo "in child"

trap "got_signal" SIGINT

function got_signal {
  echo "trapped"
  exit 0
}

while [ true ]; do
    sleep 2
done

在运行此功能并稍后运行时

When running this and later do

kill -SIGINT (pid)

一切正常，打印出被困"并退出.

Everything works as expected, it prints 'trapped' and exits.

现在，如果我从这样的父脚本中启动相同的脚本:

Now, if I start the same script from a parent script like this :

#!/bin/bash

echo "starting the child"

./child.sh &

然后孩子不再捕获信号了....?

Then the child does not trap the signal anymore.... ?

更改为使用SIGTERM而不是SIGINT后，它似乎可以正常工作...?

After changing to use SIGTERM instead of SIGINT, it seems to be working correctly... ?

推荐答案

OSX上的bash联机帮助页(但在其他版本中应该相同)中对信号处理的说法是这样的:

The bash manpage on OSX (but it should be the same in other versions) has this to say about signal handling:

，然后在trap命令下:

由于默认情况下脚本不使用作业控制，所以这就是您要讨论的情况.

Since scripts don't use job control by default, this means the case you're talking about.

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