Execute code at runlevel change in c/c++

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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.

Posted 23-Apr-15 13:19pm

Member 10850253

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Sergey Alexandrovich Kryukov 24-Apr-15 0:22am

Linux? *NIX? You really need to explain a lot more.
—SA

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Solution 1

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.

Posted 23-Apr-15 21:51pm

Richard MacCutchan

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Member 10850253 · Accepted Answer · 2015-04-24T02:45:00

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?