#include "myhead.h"void *read_msg(void *argc);int main()
{int ret = 0;int socketfd = 0;                                //局部变量保存在栈空间，而栈空间是脏的==》里面还是保存的是上一次这个区域里面保存的值；int clientfd = 0;pid_t pid = 0;pthread_t th = 0;struct sockaddr_in sock_server = {0};              //变量类型保存在netinet/in.h里面的；struct sockaddr_in sock_client = {0};          //保存连接的客户端那边的信息；socklen_t len = sizeof(struct sockaddr);//第一步：创建套接字；socketfd = socket(AF_INET,SOCK_STREAM,0);if(socketfd == -1)      //入口检查{perror("socket");    //打印错误信息return -1;}printf("socket success...\n");                 //确保前面的代码是运行正确的；//第二步：给套接字绑定必要的信息；sock_server.sin_family = AF_INET;               //给服务程序绑定地址族；sock_server.sin_port = htons(MYPORT);          //给服务器程序设定个端口号；
//  sock_server.sin_addr.s_addr = inet_addr(MYADDR);//给服务程序绑定IP地址；sock_server.sin_addr.s_addr = htonl(INADDR_ANY);//绑定任意ip地址；这样就能够实现像之前说的./client 192.168.1.233这样使用ret = bind(socketfd,(struct sockaddr *)&sock_server,sizeof(struct sockaddr));if(ret == -1){perror("bind");return -1;}printf("bind success..\n");//第三步：listen监听！ret = listen(socketfd,10);if(ret == -1){perror("listen");return -1;}printf("listen success...\n");//这里的第四步accept放到下面的while（1）里面，有许多client要连接到服务器中来
//  clientfd = accept(socketfd,(struct sockaddr *)&sock_client,&len);
//  if(clientfd == -1)
//  {
//      perror("accept");
//      return -1;
//  }
//  printf("accept success...clinet fd = %d\n",clientfd);while(1){clientfd = accept(socketfd,(struct sockaddr *)&sock_client,&len);if(clientfd == -1){perror("accept");return -1;}printf("accept success... clientfd = %d\n",clientfd);  //客户端连接进来，ret = pthread_create(&th,NULL,read_msg,&clientfd);        //执行read_msg这个函数。传递clientfd，要知道从哪一个客户端来读取数据；if(ret != 0){perror("pthread_create");return -1;}}close(socketfd);return 0;
}void *read_msg(void *argc)
{//argc首先是void类型的指针，经过(int *)argc强制转化为int *的指针，接下来要从argc所指向的地址里面取值；//===>*((int *)argc);===>经过以上的操作就将pthread_create()里面传递的参数，赋值给fd;int fd = *((int *)argc);printf("fd = %d\n",fd);      //验证fd是否等于main函数里面的cleintfd;    4char recvbuff[20] = {0};   //用来保存接收的信息int recvcnt = 0;              //用来存recv函数的返回值while(1){bzero(recvbuff,sizeof(recvbuff));     //先清空recvbuff里面的内容。recvcnt = read(fd,recvbuff,sizeof(recvbuff));    //从recvbuff中读取，sizeof（recvbuff）大小的内容到为文件描述符fd的文件中if(recvcnt == -1){perror("recv");return NULL;}else if(recvcnt == 0)           {printf("The Client is closed!\n");break;}else{printf("Recv from Client %d bytes,data:%s\n",recvcnt,recvbuff);  //打印接收到的信息}if(strcmp(recvbuff,"end") == 0){break;}}close(fd);return NULL;
}

3.client.c

#include "myhead.h"//int main()
int main(int argc,char **argv)
{//参数入口检查；if(argc != 2)              //usage: ./client 192.168.1.233{perror("argc");return -1;}int socketfd = 0;int ret = 0;struct sockaddr_in sock_server = {0};socketfd = socket(AF_INET,SOCK_STREAM,0);        //第一步还是创建套接字if(-1 == socketfd){perror("socket");return -1;}printf("socket success...\n");//用sock_server提醒你们这边连接的是服务器端的IP地址和端口号；sock_server.sin_family = AF_INET;sock_server.sin_port = htons(MYPORT);
//  sock_server.sin_addr.s_addr = inet_addr(MYADDR);sock_server.sin_addr.s_addr = inet_addr(argv[1]);ret = connect(socketfd,(struct sockaddr *)&sock_server,sizeof(struct sockaddr));        //连接服务器if(ret == -1){perror("connect");return -1;}char sendbuff[20] = {0};int sendcnt = 0;while(1){//第一步：提示客户输入要发送的数据；printf("Please input a string:\n");scanf("%s",sendbuff);//第二步：调用send向套接字发送数据；
//      sendcnt = send(socketfd,sendbuff,strlen(sendbuff),0);sendcnt = write(socketfd,sendbuff,strlen(sendbuff));if(sendcnt == -1){perror("send");return -1;}else{printf("Send to Server %d bytes,data:%s\n",sendcnt,sendbuff);}//第三步：判断发送的数据是否是end,如果是，就结束；if(strcmp(sendbuff,"end") == 0){close(socketfd);break;}}return 0;
}