作业要求：

1> 将广播发送端和接收端各实现一遍

2> 将组播发送端和接收端各实现一遍

3> 将流式域套接字的服务器端和客户端各实现一遍

1：将广播发送端和接收端各实现一遍

运行代码：

服务端：

客户端：

运行截图：

2：将组播发送端和接收端各实现一遍

运行代码：

服务端：

客户端：

运行截图：

3：将流式域套接字的服务器端和客户端各实现一遍

运行代码：

服务端：

#include<myhead.h>
int main(int argc, const char *argv[])
{//1.创建套接字文件int cfd = socket(AF_UNIX,SOCK_STREAM,0);if(-1==cfd){perror("socket error");return -1;}printf("%d success:cfd = %d\n",__LINE__,cfd);//判断文件是否存在if(access("./linux",F_OK)==0){if(unlink("./linux")==-1){perror("unlink");return -1; }}//绑定自己struct sockaddr_un cun;cun.sun_family = AF_UNIX;strcpy(cun.sun_path,"./linux");if(bind(cfd,(struct sockaddr *)&cun,sizeof(cun))==-1){perror("bind");return -1;}printf("%d success:bind\n",__LINE__);//请求连接struct sockaddr_un sun;sun.sun_family = AF_UNIX;strcpy(sun.sun_path,"./unix");if(connect(cfd,(struct sockaddr *)&sun,sizeof(sun))==-1){perror("connect");return -1;}printf("%d success:connect\n",__LINE__);//信息交互char wbuf[128]="";while(1){printf("请输入>>>");fgets(wbuf,sizeof(wbuf)-1,stdin);wbuf[strlen(wbuf)-1]=0;send(cfd,wbuf,strlen(wbuf),0);bzero(wbuf,sizeof(wbuf));recv(cfd,wbuf,sizeof(wbuf),0);printf("收到信息>>>%s\n",wbuf);}//关闭文件close(cfd);return 0;
}

客户端：

#include<myhead.h>
int main(int argc, const char *argv[])
{//1.创建套接字文件int sfd = socket(AF_UNIX,SOCK_STREAM,0);if(-1==sfd){perror("socket error");return -1;}printf("%d success:sfd = %d\n",__LINE__,sfd);//2.判断文件是否存在if(access("./unix",F_OK)==0){if(unlink("./unix")==-1){perror("unlink error");return -1;}}printf("%d success\n",__LINE__);//3.绑定struct sockaddr_un sun;sun.sun_family = AF_UNIX;strcpy(sun.sun_path,"./unix");if(-1==bind(sfd,(struct sockaddr *)&sun,sizeof(sun))){perror("bind error");return -1;}printf("%d success:bind\n",__LINE__);//4.开启监听模式if(-1==listen(sfd,128)){perror("listen error");return -1;}printf("%d success:listen\n",__LINE__);//5.接受连接int newfd;struct sockaddr_un cun;socklen_t socklen = sizeof(cun);if(-1 == (newfd = accept(sfd,(struct sockaddr *)&cun,&socklen))){perror("accept error");return -1;}printf("%d success:accept\n",__LINE__);printf("[%s] 发来连接请求\n",cun.sun_path);//6.信息交互char rbuf[128] = "";while(1){bzero(rbuf,sizeof(rbuf));int res = recv(newfd,rbuf,sizeof(rbuf)-1,0);if(res<=0){printf("客户端已下线\n");return -1;}printf("%d [%s]>>>%s\n",__LINE__,cun.sun_path,rbuf);strcat(rbuf," *<*");send(newfd,rbuf,strlen(rbuf),0); //printf("发送成功\n");}//7.关闭close(sfd);close(newfd);return 0;
}

运行截图：