在释放进程退出端口绑定 [英] Releasing bound ports on process exit

问题描述

我如何确保绑定到端口的套接字正确的进程退出释放，这样的端口可以不绑定（重复使用）与EADDRINUSE失败？我写了一个小程序刚刚创建一个套接字，将其绑定到一个固定的端口，等待连接，然后立即终止。当我重新运行该程序，在bind（）调用失败，EADDRINUSE，但如果我等待几分钟，它成功。

How do I make sure that a socket bound to a port is properly release on process exit such that the port can be reused without bind() failing with EADDRINUSE? I've written a tiny program which just creates a socket, binds it to a fixed port, waits for a connection and then immediately terminates. When I rerun the program, the bind() call fails with EADDRINUSE, but if I wait a few minutes, it succeeds.

有没有一种方法，我可以明确地取消绑定插座，从而释放的端口号？

Is there a way I can explicitly "unbind" the socket, thereby freeing the port number?

推荐答案

使用SO_REUSEADDR套接字选项可以让你毫不拖延地重新启动该程序。

Using SO_REUSEADDR socket option will allow you to re-start the program without delay.

int iSetOption = 1;
...
sockfd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
setsockopt(_sockfd, SOL_SOCKET, SO_REUSEADDR, (char*)&iSetOption,
        sizeof(iSetOption))
...

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