假期day3

进程三种通信方式

第一种套接字通信

服务器端

#include 
#define IP "192.168.31.243"
#define PORT 8888
int main(int argc, const char *argv[])
{
	//创建连接套接字
	int sfd=-1;
	if((sfd=socket(AF_INET,SOCK_STREAM,0))==-1)
	{
		perror("socket error");
		return -1;
	}
	printf("套接字创建成功\n");

	//绑定地址信息结构体
	struct sockaddr_in sin;
	sin.sin_family=AF_INET;
	sin.sin_port=htons(PORT);
	sin.sin_addr.s_addr=inet_addr(IP);
	if(bind(sfd,(struct sockaddr*)&sin,sizeof(sin))==-1)
	{
		perror("bind error");
		return -1;
	}
	printf("绑定成功\n");

	//开启监听状态
	if(listen(sfd,128)==-1)
	{
		perror("listen error");
		return -1;
	}
	printf("监听成功\n");

	//定义用于接收客户端地址信息的结构体
	struct sockaddr_in cin;
	socklen_t socklen=sizeof(cin);
	int newfd=-1;
	if((newfd=accept(sfd,(struct sockaddr*)&cin,&socklen))==-1)
	{
		perror("accept error");
		return -1;
	}
	printf("连接成功\n");

	//收发数据
	char rbuf[128]="";
	while(1)
	{
		bzero(rbuf,sizeof(rbuf));
		int res=recv(newfd,rbuf,sizeof(rbuf),0);
		if(res==0)
		{
			printf("客户端下线\n");
			break;
		}
		printf("[%s:%d]:%s\n",inet_ntoa(cin.sin_addr),ntohs(cin.sin_port),rbuf);
	}
	//关闭套接字
	close(newfd);
	close(sfd);
	return 0;
}

客户端代码

#include 
#define IP "192.168.31.243"
#define PORT 8888
int main(int argc, const char *argv[])
{
	
	//创建通信套接字
	int cfd=-1;
	if((cfd=socket(AF_INET,SOCK_STREAM,0))==-1)
	{
		perror("socket error");
		return -1;
	}
	printf("创建成功\n");

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

	//连接服务器
	struct sockaddr_in sin;
	sin.sin_family=AF_INET;
	sin.sin_port=htons(PORT);
	sin.sin_addr.s_addr=inet_addr(IP);
	if(connect(cfd,(struct sockaddr*)&sin,sizeof(sin))==-1)
	{
		
		perror("connect error");
		return -1;
	}
	printf("连接服务器成功\n");

	//收发数据
	char wbuf[128]="";
	while(1)
	{
		bzero(wbuf,sizeof(wbuf));
		fgets(wbuf,sizeof(wbuf),stdin);
		wbuf[strlen(wbuf)-1]=0;
		send(cfd,wbuf,sizeof(wbuf),0);
	/*	int res=recv(cfd,wbuf,sizeof(wbuf),0);
		if(res==0)
		{
			printf("服务器已下线\n");
			break;
		}*/
	}
	//关闭套接字
	close(cfd);
	return 0;
}

第二种方式

无名管道

#include 
int main(int argc, const char *argv[])
{
	pid_t pid=-1;
	int pipefd[2]={0};
	if(pipe(pipefd)==-1)
	{
		perror("pipe error");
		return -1;
	}
	//创建一个子进程
	pid=fork();
	if(pid>0)
	{
		//父进程
		close(pipefd[0]);//关闭读端
		char buf[128]="";
		while(1)
		{
			fgets(buf,sizeof(buf),stdin);
			buf[strlen(buf)-1]=0;
			write(pipefd[1],buf,sizeof(buf));//写数据
			if(strcmp(buf,"quit")==0)
			{
				break;
			}
		}
		close(pipefd[1]);//关闭写端
	}
	else if(pid==0)
	{
		//子进程
		close(pipefd[1]);//关闭写端
		char rbuf[128]="";
		while(1)
		{
			bzero(rbuf,sizeof(rbuf));
			read(pipefd[0],rbuf,sizeof(rbuf));
			printf("收到消息%s\n",rbuf);
			if(strcmp(rbuf,"quit")==0)
			{
				break;
			}
		}
		close(pipefd[0]);//关闭读端
		exit(EXIT_SUCCESS);
	}
	else
	{
		perror("fork error");
		return -1;
	}
	wait(NULL);
	return 0;
}

第三种消息队列

接收端

#include 
#define SIZE (sizeof(struct msgbuf)-sizeof(long))
struct msgbuf
{
	long mtype;
	char mtext[1024];
};

int main(int argc, const char *argv[])
{
	//创建key值
	key_t key=ftok("/",'l');
	if(key==-1)
	{
		perror("ftok error");
		return -1;
	}
	printf("key=%#x\n",key);

	//创建消息队列
	int msgid=msgget(key,IPC_CREAT|0664);
	if(msgid==-1)
	{
		perror("msgget error");
		return -1;
	}
	printf("msgid=%d\n",msgid);

	//向消息队列存放数据
	struct msgbuf buf;
	while(1)
	{
		printf("请输入你要发送的类型");
		scanf("%ld",&buf.mtype);
		printf("请输入罅隙内容");
		scanf("%s",buf.mtext);
		msgsnd(msgid,&buf,SIZE,0);
		if(strcmp(buf.mtext,"quit")==0)
		{
			break;
		}
	}
	if(msgctl(msgid,IPC_RMID,NULL)==-1)
	{
		perror("msgctl error");
		return -1;
	}
	return 0;
}

发送端

#include 
#define SIZE (sizeof(struct msgbuf)-sizeof(long))
struct msgbuf
{
	long mtype;
	char mtext[1024];
};
int main(int argc, const char *argv[])
{
	key_t key=ftok("/",'l');
	if(key==-1)
	{
		perror("key error");
		return -1;
	}
	printf("key=%#x\n",key);

	//创建消息队列
	int msgid=msgget(key,IPC_CREAT|0664);
	if(msgid==-1)
	{
		perror("msgget error");
		return -1;
	}
	printf("msgid=%d\n",msgid);

	//从消息队列中读取数据
	struct msgbuf buf;
	while(1)
	{
		msgrcv(msgid,&buf,SIZE,0,0);
		printf("收到消息%s\n",buf.mtext);
		if(strcmp(buf.mtext,"quit")==0)
		{
			break;
		}
	}
	return 0;
}