在 Java 中捕获 SIGINT
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Capture SIGINT in Java
提问by Begui
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.
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 以及在未来版本中可能被删除的警告。
Would using JNI to call a c lib be the only option i have?
使用 JNI 调用 ac lib 是我唯一的选择吗？
采纳答案by Asgeir S. Nilsen
The way to handle this would be to register a shutdownhook. If you use (SIGINT) kill -2will cause the program to gracefully exit and run the shutdown hooks.
处理这个问题的方法是注册一个关闭钩子。如果使用 ( SIGINT)kill -2将导致程序正常退出并运行关闭挂钩。
Registers a new virtual-machine shutdown hook.
The Java virtual machine shuts down in response to two kinds of events:
The program exits normally, when the last non-daemon thread exits or when the exit (equivalently, System.exit) method is invoked, or
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.
注册一个新的虚拟机关闭钩子。
Java 虚拟机关闭以响应两种事件：
程序正常退出，当最后一个非守护线程退出或调用退出（相当于 System.exit）方法时，或
虚拟机响应用户中断（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。
I tried the following test program on OSX 10.6.3 and on kill -9it did NOTrun the shutdown hook, didn't think it would. On a kill -15it DOESrun the shutdown hook every time.
我试图在OSX 10.6.3以下测试程序和kill -9它没有不运行关闭挂钩，没想到它会。在kill -15它DOES运行关机钩每次。
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);
}
}
}
This is the documented way to write your own signal handlersthat aren't shutdown hooks in Java. Be warnedthat the com.sun.miscpackages and are un-supported and may be changed or go away at any time and probably only exist in the Sun JVM.
这是编写自己的信号处理程序的文档化方法，这些处理程序不是 Java 中的关闭挂钩。被警告的com.sun.misc包并为联合国支持，并可以改变或消失在任何时候，大概只有在Sun JVM存在。
回答by Asgeir S. Nilsen
Take a look at Integrating Signal and Exception Handlingdescribing the HotSpot JVM's ability do do signal chaining. It does involve some C-level trickery though.
看一看集成信号和异常处理描述 HotSpot JVM 的能力做信号链。不过，它确实涉及一些 C 级技巧。
Wouldn't java.lang.Runtime.addShutdownHook(Thread)be enough for your purpose? These hooks are run by the JVM upon termination, including reception of SIGINT, as long as the JVM is able to perform them.
java.lang.Runtime.addShutdownHook(Thread)对你的目的来说还不够吗？这些钩子在终止时由 JVM 运行，包括接收SIGINT，只要 JVM 能够执行它们。
回答by delitescere
Since at least Java 6, the HotSpot javacommand has had a -Xrsflag to disable the JVM signal handlers.
至少从 Java 6 开始，HotSpotjava命令有一个-Xrs标志来禁用 JVM 信号处理程序。
If you use it, you need to implement your own SIGINT, SIGTERM, SIGHUP, and SIGQUIThandlers, including one to explicitly call System.exit().
如果你使用它，你需要实现自己的SIGINT，SIGTERM，SIGHUP，和SIGQUIT处理程序，其中包括一个显式调用System.exit()。
Note: this means the thread dump facility of SIGQUIT is disabled when the -Xrsflag is present.
注意：这意味着当-Xrs标志存在时，SIGQUIT 的线程转储工具被禁用。
See https://docs.oracle.com/javase/8/docs/technotes/tools/unix/java.html#BABHDABI(also available on the Windows and Solaris javacounterparts).
请参阅https://docs.oracle.com/javase/8/docs/technotes/tools/unix/java.html#BABHDABI（也可用于 Windows 和 Solarisjava对应版本）。
