socket代码

客户端:

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <netdb.h>
#include <sys/types.h>
#include <sys/socket.h>
int main(int argc,char *argv[])
{
        int sockfd,numbytes;
        char buf[100];
        struct sockaddr_in their_addr;
        //int i = 0;
        //将基本名字和地址转换

        //he = gethostbyname(argv[1]);
        //建立一个TCP套接口
        if((sockfd = socket(AF_INET,SOCK_STREAM,0))==-1)
        {   
                perror("socket");
                printf("create socket error.建立一个TCP套接口失败");
                exit(1);
        }   
        //初始化结构体，连接到服务器的2323端口
        their_addr.sin_family = AF_INET;
        their_addr.sin_port = htons(2323);
        // their_addr.sin_addr = *((struct in_addr *)he->h_addr);
        inet_aton( "127.0.0.1", &their_addr.sin_addr );

        bzero(&(their_addr.sin_zero),8);
        //和服务器建立连接
        if(connect(sockfd,(struct sockaddr *)&their_addr,sizeof(struct sockaddr))==-1)
        {   
                perror("connect");
                exit(1);
        }   
        //向服务器发送数据
        if(send(sockfd,"hello!socket.",6,0)==-1)
          {
                perror("send");
                exit(1);
        }
        //接受从服务器返回的信息
        if((numbytes = recv(sockfd,buf,100,0))==-1)
        {
                perror("recv");
                exit(1);
        }
        buf[numbytes] = '\0';
        printf("Recive from server:%s\n",buf);
        //关闭socket
        close(sockfd);
        return 0;
}

服务器端:


#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <errno.h>


int main()
{
        int sockfd,new_fd;
        struct sockaddr_in my_addr;
        struct sockaddr_in their_addr;
        int sin_size;
        //建立TCP套接口
        if((sockfd = socket(AF_INET,SOCK_STREAM,0))==-1)
        {   
                printf("create socket error");
                perror("socket");
                exit(1);
        }   
        //初始化结构体，并绑定2323端口
        my_addr.sin_family = AF_INET;
        my_addr.sin_port = htons(2323);
        my_addr.sin_addr.s_addr = INADDR_ANY;
        bzero(&(my_addr.sin_zero),8);
        //绑定套接口
        if(bind(sockfd,(struct sockaddr *)&my_addr,sizeof(struct sockaddr))==-1)
        {   
                perror("bind socket error");
                exit(1);
        }   
        //创建监听套接口
        if(listen(sockfd,10)==-1)
        {
                perror("listen");
                exit(1);
        }
        //等待连接
        while(1)
        {
                sin_size = sizeof(struct sockaddr_in);
                printf("server is run.\n");
                //如果建立连接，将产生一个全新的套接字
                if((new_fd = accept(sockfd,(struct sockaddr *)&their_addr,&sin_size))==-1)
                {
                        perror("accept");
                        exit(1);
                }
                printf("accept success.\n");
                //生成一个子进程来完成和客户端的会话，父进程继续监听
                if(!fork())
                {
                        printf("create new thred success.\n");
                        //读取客户端发来的信息
                        int numbytes;
                        char buff[256];
                        memset(buff,0,256);
                        if((numbytes = recv(new_fd,buff,sizeof(buff),0))==-1)
                        {
                                perror("recv");
                                exit(1);
                        }
                        printf("%s",buff);
                        //将从客户端接收到的信息再发回客户端
                        if(send(new_fd,buff,strlen(buff),0)==-1)
                                perror("send");
                        close(new_fd);
                        exit(0);
      }
                close(new_fd);
        }
        close(sockfd);
}