多个庆典陷阱相同的信号 [英] multiple bash traps for the same signal

问题描述

当我在bash使用陷阱命令，对于给定信号previous陷阱将被替换。

When I use the "trap" command in bash, the previous trap for the given signal is replaced.

有使多个陷阱火为同一信号的一种方式？

Is there a way of making more than one trap fire for the same signal?

推荐答案

编辑：

看来我误解的问题。答案很简单：

It appears that I misread the question. The answer is simple:

handler1 () { do_something; }
handler2 () { do_something_else; }
handler3 () { handler1; handler2; }

trap handler3 SIGNAL1 SIGNAL2 ...

---

原文：

只要在命令的末尾列出多个信号

Just list multiple signals at the end of the command:

trap function-name SIGNAL1 SIGNAL2 SIGNAL3 ...

您可以找到使用陷阱-p特定的信号相关联的功能：

You can find the function associated with a particular signal using trap -p:

trap -p SIGINT

请注意，它单独列出，即使它们是由相同的函数处理的每个信号。

Note that it lists each signal separately even if they're handled by the same function.

您可以给出一个已知的通过这样增加一个额外的信号：

You can add an additional signal given a known one by doing this:

eval "$(trap -p SIGUSR1) SIGUSR2"

此工作，即使存在由相同功能正在处理其它附加信号。换句话说，假设一个函数已经处理三个信号 - 你可以添加两个只是参照一个现有的和追加两个（其中只有一个是上面显示刚刚闭幕引号）

This works even if there are other additional signals being processed by the same function. In other words, let's say a function was already handling three signals - you could add two more just by referring to one existing one and appending two more (where only one is shown above just inside the closing quotes).

如果你正在使用bash> = 3.2，你可以做这样的事情，提取给出的信号的功能。请注意，这不是一个完全健壮，因为其他的单引号可能出现。

If you're using Bash >= 3.2, you can do something like this to extract the function given a signal. Note that it's not completely robust because other single quotes could appear.

[[ $(trap -p SIGUSR1) =~ trap\ --\ \'([^\047])\'.* ]]
function_name=${BASH_REMATCH[1]}

然后，你可以从头开始，如果你需要使用的函数名，等重建你的陷阱命令。

Then you could rebuild your trap command from scratch if you needed to using the function name, etc.

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