网络编程-5

 select实现的TCP并发服务器

#include<myhead.h>
#define SER_IP "192.168.125.230"        //服务器IP地址
#define SER_PORT 8888                   //服务器端口号
int main(int argc, const char *argv[])
{
	

	//1、创建套节字：用于接收客户端链接请求的
	int sfd = socket(AF_INET, SOCK_STREAM, 0);
	if(sfd == -1)
	{
		perror("socket error");
		return -1;
	}
	printf("socket success sfd = %d\n", sfd);     //3

	//设置端口号快速重用
	int reuse = 1;
	if(setsockopt(sfd, SOL_SOCKET, SO_REUSEADDR, &reuse, sizeof(reuse))==-1)
	{
		perror("setsockopt error");
		return -1;
	}
	printf("端口号快速重用成功\n");

	//2、绑定IP地址和端口号
	//2.1 填充地址信息结构体
	struct sockaddr_in sin;
	sin.sin_family = AF_INET;       //地址族
	sin.sin_port = htons(SER_PORT);  //端口号
	sin.sin_addr.s_addr = inet_addr(SER_IP);    //IP地址

	//2.2 绑定工作
	if( bind(sfd, (struct sockaddr*)&sin, sizeof(sin)) ==-1)
	{
		perror("bind error");
		return -1;
	}
	printf("bind success\n");


	//3、讲套节字设置成被动监听状态
	if( listen(sfd, 128) == -1)
	{
		perror("listen error");
		return -1;
	}
	printf("listen success\n");


	//4、阻塞等待客户端连接请求
	//定义地址信息结构体变量用于接受客户端的地址信息
	struct sockaddr_in cin;
	socklen_t socklen = sizeof(cin);     //接受地址信息的长度
	int newfd = -1;
	int maxfd = sfd;

	struct sockaddr_in cin_arr[1024];

	fd_set  readfds,tempfds;
	FD_ZERO(&readfds);
	FD_SET(0,&readfds);
	FD_SET(sfd,&readfds);

	while(1)
	{
		tempfds = readfds;

		int res = select(maxfd+1,&tempfds,NULL,NULL,NULL);

		if(res == 0)
		{
			printf("time out\n");
			return -1;
		}
		else if(res == -1)
		{
			perror("select error");
			return -1;
		}

		for(int i = 0;i<=maxfd ; i++)
		{
			if(!FD_ISSET(i,&tempfds))
				continue;

			if(i==sfd)
			{
				newfd = accept(sfd, (struct sockaddr*)&cin, &socklen);
				if(newfd == -1)
				{
					perror("accept error");
					return -1;
				}

				printf("[%s:%d]:已连接, newfd = %d\n",\
						inet_ntoa(cin.sin_addr), ntohs(cin.sin_port) ,newfd);    //4
				FD_SET(newfd,&readfds);
				cin_arr[newfd] = cin;
				maxfd = maxfd>=newfd? maxfd:newfd;
			}
			else if(i==0)
			{
				char aaa[128]="";
				scanf("%s",aaa);
				printf("消息为%s\n",aaa);
				for(int i=4;i<=maxfd;i++)
					send(i,aaa,strlen(aaa),0);
			}
			else 
			{

				char rbuf[128] = "";       //用于接受消息


				bzero(rbuf, sizeof(rbuf));    //清空容器
				//从套接字文件中读取消息
				//int ret = read(newfd, rbuf, sizeof(rbuf));
				int ret = recv(i, rbuf, sizeof(rbuf), 0);
				if(ret == 0)
				{
					printf("客户端已下线\n");
					close(i);
					FD_CLR(i,&readfds);
					for(int j =maxfd;j>sfd;j--)
					{
						maxfd=j;
						break;
					}
					continue;
				}
				printf("[%s:%d]: %s\n", \
						inet_ntoa(cin_arr[i].sin_addr), ntohs(cin_arr[i].sin_port),rbuf );


				for(int i=4;i<=maxfd;i++)
					send(i,rbuf,strlen(rbuf),0);

			}

		
		}
	}

		close(sfd);

		return 0;
	}

poll实现的TCP客户端

#include <myhead.h>
#define SER_IP "192.168.125.230"
#define SER_PORT 8888
#define CLI_IP "192.168.125.230"
#define CLI_PORT 9999
int main(int argc, const char *argv[])
{
	int cfd = socket(AF_INET,SOCK_STREAM,0);
	if(cfd == -1)
	{
		perror("socket error");
		return -1;
	}
	printf("socket success  cfd = %d\n",cfd);

	int reuse = 1;
	if(setsockopt(cfd,SOL_SOCKET,SO_REUSEADDR,&reuse,sizeof(reuse))==-1)
	{
		perror("setsockopt error");
		return -1;
	}
	printf("端口重用成功\n");

	struct sockaddr_in cin;
	cin.sin_family = AF_INET;
	cin.sin_port = htons(CLI_PORT);
	cin.sin_addr.s_addr = inet_addr(CLI_IP);

	if(	bind(cfd,(struct sockaddr*)&cin,sizeof(cin))==-1)
	{
		perror("bind error");
		return -1;
	}
	printf("bind success\n ");

	struct sockaddr_in sin;
	sin.sin_family = AF_INET;
	sin.sin_port = htons(SER_PORT);
	sin.sin_addr.s_addr = inet_addr(SER_IP);
	if( connect(cfd,(struct sockaddr*)&sin,sizeof(sin))==-1      )
	{
		perror("connect error");
		return -1;
	}
	printf("connect success \n");

	struct pollfd pfds[2];
	pfds[0].fd = 0;
	pfds[0].events = POLLIN;
	pfds[1].fd = cfd;
	pfds[1].events = POLLIN;

	char wbuf[128]="";
	while(1)
	{
		int res = poll(pfds,2,-1);
		if(res == 0)
		{
			printf("time out\n");
			return -1;
		}
		
		else if(res == -1)
		{
			perror("poll error");
			return -1;
		}
		
		if(pfds[0].revents == POLLIN)
		{
			fgets(wbuf,sizeof(wbuf),stdin);
			wbuf[strlen(wbuf)-1]=0;
			if(strcmp(wbuf,"quit")==0)
			{
				break;
			}
			send(cfd,wbuf,strlen(wbuf),0);

		}
		if(pfds[1].revents == POLLIN)
		{
			bzero(wbuf,sizeof(wbuf));
			recv(cfd,wbuf,sizeof(wbuf),0);
			printf("收到服务器的消息为:%s\n",wbuf);
		}

	}
	close(cfd);



	return 0;
}