Linux下C醒目的正常终止终止信号 [英] Linux C catching kill signal for graceful termination

问题描述

我使用套接字，数据库连接和喜欢的过程。它基本上是一个服务器进程的传感器数据和网络接口之间的中继，因此它以确保该应用程序，如果杀死，终止正常是重要的。

I have a process using sockets, database connections and the likes. It is basically a server process relaying between sensor data and a web interface, and as such it is important to ensure the application, if killed, terminates gracefully.

我如何处理突发性的异常，如段错误（至少对于调试），以及终止信号，这样我可以关闭所有连接和停止运行，这样的过程不会留下任何一个烂摊子它使用的线程？

How do I handle unexpected exceptions such as segfaults(at least for debugging) as well as kill signals so that I can close any connections and stop any threads running so that the process does not leave a mess of anything it is using?

推荐答案

您安装信号处理程序捕捉信号，它将愉快地关闭所有文件，插座，可用内存和关闭线程。

You install signal handlers to catch signals -- however in 99% of cases you just want to exit and let the Linux OS take care of the cleanup -- it will happily close all files, sockets, free memory and shutdown threads.

所以，除非有什么具体你想做的事情，就像上的插座发送消息，那么你应该从工艺只是退出，不要试图捕捉信号。

So unless there is anything specifically you want to do, like sending a message on the sockets, then you should just exit from the process and not try to catch the signal.

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