closesocket写在while(1)循环外面是关闭exe程序时调用吗？

Question

while(1)
	{
		memset(buf,0,sizeof(buf));
		printf("send message: ");
		fgets(buf,sizeof(buf),stdin);
		if(nret=send(connection,buf,sizeof(buf),0)==SOCKET_ERROR)
		{
			printf("send message failed %dn",WSAGetLastError());
			closesocket(connection);
			WSACleanup();
			return 0;
		}
		printf("the data was send to %s successfullyn",inet_ntoa(seraddr.sin_addr));
		if(strncmp(buf,"exit",sizeof("exit"))==0)
		{
			break;
		}
		 memset(buf,0,sizeof(buf));
		 if(nret=recv(connection,buf,sizeof(buf),0)==SOCKET_ERROR)
		 {
			printf("recv failed %dn",WSAGetLastError());//why not WSACleanup()......
		 }
		printf("the following data was received from %s successfullyn",inet_ntoa(seraddr.sin_addr));
		printf(buf);
		
	}
	closesocket(connection);
	WSACleanup();
	return 0;
}

    在socket编程中，最后closesocket（）的函数是放在while(1)循环的外面，是在关闭exe程序的时候才调用吗？还是怎么的？求教~谢谢~

Answer 1

一个简单的收发数据消息的代码段

如果发送的字符串是"exit"就跳出循环

不过这句

14        if(strncmp(buf,"exit",sizeof("exit"))==0)

15

{