套接字编程C ++ setsockopt()

时间:2018-01-15 12:36:38

标签: c++ sockets setsockopt

我是套接字编程的新手。我正在尝试编写一个基本的套接字编程程序。我查找了socket(),bind(),setsockopt()函数和其他函数以及工作代码示例的用法。在setsockopt()函数中,我使用了SO_REUSEPORT选项,但是第一次在给定端口地址上运行程序时它工作正常,但是对于任何后续运行绑定都会失败,除非我已经更改为其他一些端口地址

我的代码示例: -

#include<iostream>
#include<cstdio>
#include<sys/socket.h>
#include<sys/types.h>
#include <netinet/in.h>
#include<unistd.h>
#include<cstdlib>
#include<cstring>
using namespace std;

int main(){

    int opt=1;
    socklen_t optlen=sizeof(opt);
    char buffer[1024] = {0};
    int sock=socket(AF_UNIX,SOCK_STREAM,0);
    if(sock==-1)
    {
    cout<<"Socket Creation not successful"<<endl;
    exit(1);
    }
    cout<<"Socket Created"<<endl;
    setsockopt(sock,SOL_SOCKET,SO_REUSEADDR|SO_REUSEPORT,&opt,optlen);
    struct sockaddr_in address;
    address.sin_family = AF_UNIX;
    address.sin_addr.s_addr = htonl(INADDR_ANY);
    address.sin_port = htons(9091);

    int addrlen = sizeof(address);
    int x=bind(sock,(struct sockaddr *)&address,
                            sizeof(address));
    if(x==-1)
    {
            cout<<"Binding Unsuccessful"<<endl;
            exit(1);
    }
    cout<<"Binding successful"<<endl;

/*

     if(x<0)
//      {
//      perror("Bind failed");
//      exit(EXIT_FAILURE);
//      }
    int y=listen(sock,5);
    int neww= accept(sock,(struct sockaddr *)&address, 
                   (socklen_t*)&addrlen);
    //int val=read(neww 
 cout<<sock<<endl;
 cout<<x<<endl;
cout<<y<<endl;
cout<<neww<<endl;

cout<<"Haha";
int valread = read (neww , buffer, 1024);
puts(buffer);
send(neww,buffer,strlen(buffer),0);

*/

int c=close(sock);
cout<<c<<endl;
}

P.S。我是一个初学者,并不太了解上面使用的大多数参数

1 个答案:

答案 0 :(得分:3)

我认为这就是你想要做的事情:

  const int opt = 1;
  setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
  setsockopt(sock, SOL_SOCKET, SO_REUSEPORT, &opt, sizeof(opt));