C++ 如何关闭套接字
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How to close socket
提问by Avihai Marchiano
Run c++ on Ubuntu. I open socket in this way:
在 Ubuntu 上运行 C++。我以这种方式打开套接字：
socket(AF_PACKET, SOCK_RAW, IPPROTO_RAW))
What do i need to do in the end of the use? Some socket will be used as long as the program run , do i need to check them from a while? to see if socket still exist?
使用结束后我需要做什么？只要程序运行，就会使用一些套接字，我需要暂时检查它们吗？看看socket是否还存在？
回答by Kerrek SB
The socket exists until you call closeon its file descriptor. Since you have a raw IP socket, there's no notion of "being alive". Just close it when you're done using it.
套接字一直存在，直到您调用close其文件描述符。由于您有一个原始 IP 套接字，因此没有“活着”的概念。用完后关闭即可。
回答by Kerrek SB
As its docs/man page say, socket() returns an open file descriptor or -1 if it fails. That means you have to close it as you would close any other file descriptor:
正如其文档/手册页所说，socket() 返回一个打开的文件描述符，如果失败则返回 -1。这意味着您必须像关闭任何其他文件描述符一样关闭它：
close(sockfd);
