用Java捕获SIGINT [英] Capture SIGINT in Java

问题描述

在不使用JNI的情况下在Java中捕获终止信号的最佳方法是什么.我确实发现了sun.misc.Signal和sun.misc.SignalHandler以及在将来的发行版中可能被删除的警告.

What is the best way to capture a kill signal in java without using JNI. I did discover the sun.misc.Signal and the sun.misc.SignalHandler and the warning of the possibility of being removed in the future releases.

使用JNI调用c lib是我唯一的选择吗?

Would using JNI to call a c lib be the only option i have?

推荐答案

处理此问题的方法是注册

The way to handle this would be to register a shutdown hook. If you use (SIGINT) kill -2 will cause the program to gracefully exit and run the shutdown hooks.

注册新的虚拟机 关闭挂钩.

Registers a new virtual-machine shutdown hook.

Java虚拟机在 对两种事件的响应:

The Java virtual machine shuts down in response to two kinds of events:

• 当最后一个非守护程序线程退出或调用exit(等效于System.exit)方法时，程序会正常退出，或者

• The program exits normally, when the last non-daemon thread exits or when the exit (equivalently, System.exit) method is invoked, or

响应于用户中断(例如键入^ C)或系统范围的事件(例如用户注销或系统关闭)而终止虚拟机.

The virtual machine is terminated in response to a user interrupt, such as typing ^C, or a system-wide event, such as user logoff or system shutdown.

我在OSX 10.6.3上尝试了以下测试程序，并且在kill -9上它没有运行 NOT (关闭)钩子，没有想到.在kill -15上，它确实每次都运行关闭钩子.

I tried the following test program on OSX 10.6.3 and on kill -9 it did NOT run the shutdown hook, didn't think it would. On a kill -15 it DOES run the shutdown hook every time.

public class TestShutdownHook
{
    public static void main(final String[] args) throws InterruptedException
    {
        Runtime.getRuntime().addShutdownHook(new Thread()
        {
            @Override
            public void run()
            {
                System.out.println("Shutdown hook ran!");
            }
        });

        while (true)
        {
            Thread.sleep(1000);
        }
    }
}

这是编写您自己的信号处理程序在Java中不是shutdown挂钩. 警告 com.sun.misc软件包和未受支持，并且可以随时更改或取消，并且可能仅存在于Sun JVM中.

This is the documented way to write your own signal handlers that aren't shutdown hooks in Java. Be warned that the com.sun.misc packages and are un-supported and may be changed or go away at any time and probably only exist in the Sun JVM.

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