在c / c ++中运行级别更改时执行代码 [英] Execute code at runlevel change in c/c++

问题描述

我正在尝试在java中创建一个使用某些c / c ++代码的应用程序，以便在计算机关闭，重启，休眠，睡眠或注销之前执行某些代码。我在java论坛上被告知我必须使用c / c ++编码才能做到这一点。我想知道在我的c / c ++应用程序中的终端中使用命令运行级别是否足够，如果返回了某些内容，那么我会将其发送到我的java应用程序，以完成剩下的工作。如果这还不够，有人可以给我一个关于我如何解决问题的建议吗？

谢谢。

I am trying to make an app in java that uses some c/c++ code in order to execute some code before computer shutdown,restart,hibernate,sleep or logoff. I was told in the java forum that I had to use c/c++ coding to do this. I was wondering if it would be enough to use the command runlevel in a terminal in my c/c++ app, and if that returns something, then I would send that to my java app, to do the rest. If this is not enough, could someone give me a suggestion as to how I could solve my problem?
Thanks.

推荐答案

没有不是你被告知的。我所说的是你需要知道Linux是否提供了一种向应用程序发送消息的机制，告知它正在关闭它。

No that is not what you were told. What I said was that you need to find out if Linux provides a mechanism for sending messages to applications to inform them that it is shutting down.

我发现你可以在linux中使用信号，在ac / c ++应用程序中接收该消息。根据我的理解，当应用程序终止时会使用信号sigterm，因此我认为它将用于重启，关闭和注销，因为单击这些按钮时会终止所有应用程序。

我想知道的是当计算机进入休眠或睡眠状态时发送的信号是什么？

I found out that you can use signals in linux, to receive that message in a c/c++ app. From what I understand, the signal sigterm is used when the application is terminated, so from what I think, it would be used in restart, shutdown, and logoff, since all the applications are terminated when these buttons are clicked.
What I would like to know is what signal is sent when the computer goes to hibernate or sleep?

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