server.c

网络通信编程

//============================================================================
// Name        : server.cpp
// Author      : maduohe
// Version     :
// Copyright   : nercis
// Description : Hello World in C, Ansi-style
//============================================================================

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <unistd.h>
#include <netdb.h>

#define MAXSIZE 80
#define MYPORT 3490
#define BACKLOG 10
#define BUFSIZE 100

void str_ser(int sockfd);

int main(void)
  {
    int sockfd,con_fd,ret;
    struct sockaddr_in my_addr;
    struct sockaddr_in their_addr;
    int sin_size = sizeof(struct sockaddr_in);
    //char *buf;
    int pid ;
    sockfd = socket(AF_INET,SOCK_STREAM,0);
    if(sockfd<0)
      {
        printf("error in socket.");
        exit(0);
      }
    
    //创建监听套接口
    my_addr.sin_family = AF_INET;
    my_addr.sin_port = htons(MYPORT);
    my_addr.sin_addr.s_addr = htonl(INADDR_ANY);
    bzero(&(my_addr.sin_zero),8);
    ret = bind(sockfd,(struct sockaddr *)&my_addr,sizeof(struct sockaddr));
    if(ret<0)
      {
        printf("error in binding");
      }
    
    //绑定监听套接口
    ret = listen(sockfd,BACKLOG);
    if(ret<0)
      {
        printf("error in listening");
        exit(1);
      }
    
    //监听连接请求
    while(1)
      {
        ///sin_size = sizeof(struct sockaddr_in);
        con_fd = accept(sockfd,(struct sockaddr*)&their_addr,(socklen_t*)&sin_size);
        if(con_fd<0)
          {
            printf("error in accept.");
            exit(1);
          }
        //创建新的连接
        if((pid = fork()) == 0)
          {
            //子进程代码
            close(sockfd);
            str_ser(con_fd);
            //接受并处理数据
            close(con_fd);
            exit(0);
          }
        else
          {
            //父进程代码
            close(con_fd);
          }
      }
    close(sockfd);
    exit(0);
  }

void str_ser(int sockfd)
  {
    char recvs[MAXSIZE];
    int n=0;
    while(1)
      {
        if((n = recv(sockfd,recvs,MAXSIZE,0)) == 0)
          {
            return;
          }
        send(sockfd,recvs,n,0);
      }
  }