简单服务器套接字卡在绑定处

时间:2019-03-25 17:53:40

标签: c++ sockets networking tcp

im试图在Linux(Ubuntu)上用c ++编写一个简单的服务器/客户端程序。但是现在我的服务器代码出现了问题。 我可以编译代码,但是当我运行它时,它每次都会在bind函数中卡住。但是我没有收到错误信息。它甚至运行了几分钟,我没有收到任何反馈。你们知道为什么它不起作用吗?

感谢您的帮助。

#include<string.h>
#include<unistd.h>
#include<sys/types.h> 
#include<sys/socket.h>
#include<netinet/in.h>
#include<iostream>

int main()
{
   int sockfd, newsockfd, portno;
   socklen_t clilen;
   char buffer[256];
   struct sockaddr_in serv_addr, cli_addr;
   int n;

   std::cout << "Creating socket..\n";
   sockfd = socket(AF_INET, SOCK_STREAM, 0);

   memset(&serv_addr, 0, sizeof(serv_addr));
   portno = atoi("5001");

   serv_addr.sin_family = AF_INET;
   serv_addr.sin_addr.s_addr = INADDR_ANY;
   serv_addr.sin_port = htons(portno);

   std::cout << "Binding socket..\n";

   int enable = 1;
   if (setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &enable, sizeof(int)) < 0)
      std::cout << "setsockopt(SO_REUSEADDR) failed\n";

   if (bind(sockfd, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0) 
      std::cout << "ERROR on binding\n";

   std::cout << "Listening..";
   listen(sockfd,5);

   clilen = sizeof(cli_addr);
   newsockfd = accept(sockfd, (struct sockaddr *) &cli_addr, &clilen);
   if (newsockfd < 0) 
      std::cout << "ERROR on accept\n";

   bzero(buffer,256);
   n = read(newsockfd,buffer,255);

   n = write(newsockfd,"I got your message",18);

   close(newsockfd);
   close(sockfd);
   return 0; 
}

我使用以下命令进行编译:c ++ server.cpp -o server

要运行它,我使用:./server

1 个答案:

答案 0 :(得分:2)

std::cout << "Listening..";替换为std::cout << "Listening.." << std:flush;,然后阅读How does std::flush work?,了解您的未来项目

基本上,您的服务器已经在侦听新的连接,但是您缺少控制台上的“ Listening ..”输出,不是吗?