如何配置ruby以在Ctrl-C（SIGINT）上进入调试器？ [英] How do I configure ruby to enter the debugger on Ctrl-C (SIGINT)?

问题描述

我想在键入ctrl-C（或发送SIGINT）时进入调试器。我有安装调试器（我正在运行Ruby 1.9.3）并验证它是否正常工作。我已将其添加到我的安装文件（这是针对Padrino，但是我认为Rails类似）：

I'd like to enter the debugger upon typing ctrl-C (or sending a SIGINT). I have installed the debugger (I'm running Ruby 1.9.3) and verified that it works. I've added this to my setup files (this is for Padrino, but I assume it would be similar for Rails):

# file: config/boot.rb
Padrino.before_load do
  trap("SIGINT") { debugger } if Padrino.env == :development
end

...但是输入Ctrl-C不会调用调试器。实际上，如果我用 put 替换看到中断！，输入Ctrl-C不会导致

... but typing Ctrl-C does not invoke the debugger. In fact, if I replace debugger with puts "saw an interrupt!", typing Ctrl-C doesn't cause a print to happen either.

以下这个建议来自 Mike Dunlavey ，我试图从调试器中明确地调用 catch Interrupt ：

Following this suggestion from Mike Dunlavey, I tried explicitly calling catch Interrupt from within the debugger:

$ rdebug `which padrino` console
^Z^Z$HOME/usr/bin/padrino:9
require 'rubygems'
(rdb:1) catch Interrupt
Catch exception Interrupt.
(rdb:1) c
=> Loading development console (Padrino v.0.10.7)
=> Loading Application BlueDotAe
=> Loading Application Admin
irb(main):001:0>   C-c C-c^C
irb(main):001:0> 

没有快乐 - 中断没有进入调试器。

No joy -- interrupt did not enter the debugger.

我缺少什么？

推荐答案

如果要在控制台中运行时捕获SIGINT，是：你不能，除非你的猴子补丁IRB。每个使用该控制台的Ruby应用程序（不论是padrino，还是rails或者whatnot）都将最终调用 usr / lib / ruby​​ / 1.9.1 / irb.rb code> IRB.start ，它是：

If you want to trap SIGINT while running in the console, the short answer is: you cannot unless you monkey-patch IRB. Every Ruby app (whether padrino, or rails or whatnot) that uses the console will end up calling usr/lib/ruby/1.9.1/irb.rb, and in IRB.start, it does:

trap("SIGINT") do
  irb.signal_handle
end

...进入主循环之前。这将覆盖您可能在启动代码中的任何陷阱（SIGINT）。

... just before entering the main loop. This will override any trap("SIGINT") you might have put in your startup code.

但是，如果要将SIGINT陷入脚本文件中（例如，如果您想要按照 Mike Dunlavey这里所描述的代码），您可以创建一个脚本文件，例如：

But if you want to trap SIGINT in a script file (for example, if you want to profile your code as described by Mike Dunlavey here), you can create a script file such as:

# File: profile_complex_operation.rb
trap("SIGINT") { debugger }
MyApp.complex_operation

然后按如下方式调用：

$ ruby profile_complex_operation.rb

现在，当你打到^ C（或从另一个进程发送SIGINT），它将进入调试器。

Now, when you hit ^C (or send SIGINT from another process), it will enter the debugger.

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