在进程退出时释放绑定端口 [英] Releasing bound ports on process exit

问题描述

如何确保在进程退出时正确释放绑定到端口的套接字，以便可以重用端口，而 bind() 不会因 EADDRINUSE 而失败?我写了一个小程序，它只是创建一个套接字，将它绑定到一个固定端口，等待连接然后立即终止.当我重新运行程序时，bind() 调用失败并显示 EADDRINUSE，但如果我等待几分钟，它就会成功.

How do I make sure that a socket bound to a port is properly released 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.

有没有办法可以明确地解除绑定"套接字，从而释放端口号?

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

推荐答案

使用 SO_REUSEADDR 套接字选项可以让您毫不延迟地重新启动程序.

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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