如何在C中完全破坏套接字连接 [英] How to completely destroy a socket connection in C

问题描述

我在 linux 中使用套接字创建了一个聊天客户端，我希望完全破坏连接.以下是代码的相关部分:

I have made a chat client in linux using socket, and i wish to destroy the connection completely. Following is the relevant portions of the code:

int sock, connected, bytes_recieved , true = 1, pid;  
char send_data [1024] , recv_data[1024];     
struct sockaddr_in server_addr,client_addr;    
int sin_size;
label:
if ((sock = socket(AF_INET, SOCK_STREAM, 0)) == -1)
{
    perror("Socket");
    exit(1);
}
if (setsockopt(sock,SOL_SOCKET,SO_REUSEADDR,&true,sizeof(int)) == -1)
{
    perror("Setsockopt");
    exit(1);
}
server_addr.sin_family = AF_INET;         
server_addr.sin_port = htons(3128);     
server_addr.sin_addr.s_addr = INADDR_ANY; 
bzero(&(server_addr.sin_zero),8); 
if (bind(sock, (struct sockaddr *)&server_addr, sizeof(struct sockaddr))== -1)
{
    perror("Unable to bind");
    exit(1);
}
if (listen(sock, 5) == -1)
{
    perror("Listen");
    exit(1);
}
printf("
TCPServer Waiting for client on port 3128");
fflush(stdout);
connected = accept(sock, (struct sockaddr *)&client_addr,&sin_size);
//necessary code
close(sock);
goto label;

但是 close(sock) 似乎并没有完全关闭破坏连接，因为在转到标签"之后，代码正在退出并显示错误消息

but the close(sock) doesnot seem to close the destroy the connection completely, because after going to 'label' the code is exiting showing the error message

Unable to bind: Address already in use

那是连接不再发生.问题可能是什么?提前致谢.

That is the connection is not happening again. What can the problem be? Thanks in advance.

我真正想要的是，当我在破坏连接后从头开始运行脚本时，它应该作为一个新程序运行.我该怎么做?

What I actually want is, when I run the script from the beginning after destroying the connection, it should run as a fresh program. How can I do it?

推荐答案

close 调用只标记 TCP 套接字关闭.它不再被进程使用.但是内核可能仍会在一段时间内保留一些资源(TIME_WAIT、2MLS 等).

The close call only marks the TCP socket closed. It is not usable by process anymore. But kernel may still hold some resources for a period (TIME_WAIT, 2MLS etc stuff).

设置 SO_REUSEADDR 应该可以消除绑定问题.

Setting of SO_REUSEADDR should remove binding problems.

所以请确保调用 setsockopt 时 true 的值真的不为零(溢出错误可能会覆盖它):

So be sure that value of true is really non-zero when calling setsockopt (overflow bug may overwrite it):

true = 1;
setsockopt(sock,SOL_SOCKET,SO_REUSEADDR,&true,sizeof(int))

有 pid 变量是你的代码.如果你使用fork(用于启动连接处理进程)，那么你也应该在不需要它的进程中关闭sock.

There is pid variable is your code. If you use fork (for starting connection handling processs), then you should close sock also in the process which does not need it.

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