Linux C网络编程 ————4、多线程服务器编程

服务器端代码实现

#include
#include
#include 
#include 
#include 
#include 
#include
#include 
#include 


#define PORT 1234
#define BACKLOG 5
#define MAXDATASIZE 1000

void process_cli(int connfd,struct sockaddr_in client);
void * function(void *arg);
struct ARG{
	int connfd;
	struct sockaddr_in clinet;
};

main()
{
	int listenfd,connfd;
	pthread_t tid;
	struct ARG *arg;
	struct sockaddr_in server;
	struct sockaddr_in client;
	socklen_t len;
	if((listenfd=socket(AF_INET,SOCK_STREAM,0))==-1)
	{
		perror("Creating socket failed.");
		exit(1);
	}

	int opt=SO_REUSEADDR;
	setsockopt(listenfd,SOL_SOCKET,SO_REUSEADDR,&opt,sizeof(opt));
	bzero(&server,sizeof(server));
	server.sin_family=AF_INET;
	server.sin_port=htons(PORT);
	server.sin_addr.s_addr=htonl(INADDR_ANY);
	if(bind(listenfd,(struct sockaddr *)&server,sizeof(server))==-1)
	{
		perror("Bind() error");
		exit(1);
	}
	if(listen(listenfd,BACKLOG)==-1)
	{
		perror("listen() error\n");
		exit(1);
	}
	len=sizeof(client);
	while(1)
	{
		if((connfd=accept(listenfd,(struct sockaddr *)&client,&len))==-1)
		{
			perror("accept() error\n");
			exit(1);
		}
		arg=(struct ARG *)malloc (sizeof(struct ARG));
		arg->connfd=connfd;
		memcpy((void *)&arg->clinet,&client,sizeof(client));
		if(pthread_create(&tid,NULL,function,(void*)arg))
		{
			perror("Pthread_create() error");
			exit(1);
		}
	}
	close(listenfd);
}

void process_cli(int connfd,struct sockaddr_in client)
{
	int num;
	char recvbuf[MAXDATASIZE],sendbuf[MAXDATASIZE],cli_name[MAXDATASIZE];
	printf("You got a connection from %s.",inet_ntoa(client.sin_addr));
	num=recv(connfd,cli_name,MAXDATASIZE,0);
	if(num==0)
	{
		close(connfd);
		printf("Client disconnected.\n");
		return;
	}
	cli_name[num-1]='\0';
	printf("Client's name is %s.\n",cli_name);
	while(num=recv(connfd,recvbuf,MAXDATASIZE,0))
	{
		recvbuf[num]='\0';
		printf("Reveived client(%s) message:%s",cli_name,recvbuf);
		int i;
		for(i=0;i='a' && recvbuf[i]<='z')||(recvbuf[i]>='A'&&recvbuf[i]<='Z'))
			{
				recvbuf[i]=recvbuf[i]+3;
				if(recvbuf[i]>'Z'&&recvbuf[i]<='Z'+3||(recvbuf[i]>'z'))
					recvbuf[i]=recvbuf[i]-26;
			}
			sendbuf[i]=recvbuf[i];
		}
		send(connfd,sendbuf,strlen(sendbuf),0);
	}
	close(connfd);
}

void * function(void * arg)
{
	struct ARG * info;
	info =(struct ARG *)arg;
	process_cli(info->connfd,info->clinet);
	free(arg);
	pthread_exit(NULL);
}

客户端代码实现

#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#define PORT 1234
#define MAXDATASIZE 100
void process(FILE *fp,int sockfd);
char* getMessage(char* sendline,int len,FILE* fp);
int main(int argc,char *argv[]){
	int sockfd;
	struct  hostent *he;
	struct sockaddr_in server;
	if (argc!=2){
		printf("Usage:%s\n",argv[0]);
		exit(1);
	}
	if((he=gethostbyname(argv[1]))==NULL){
		printf("gethostbyname() error\n");
		exit(1);
	}
	if((sockfd=socket(AF_INET,SOCK_STREAM,0))==-1){
		printf("socket() error\n");
		exit(1);
	}
	bzero(&server,sizeof(server));
	server.sin_family=AF_INET;
	server.sin_port=htons(PORT);
	server.sin_addr=*((struct in_addr *)he->h_addr);
	if(connect(sockfd,(struct sockaddr *)&server,sizeof(server))==-1){
		printf("connect() error\n");
		exit(1);
	}
	process(stdin,sockfd);
	close(sockfd);
}
void process(FILE *fp,int sockfd){
	char sendline[MAXDATASIZE],recvline[MAXDATASIZE];
	int num;
	printf("Connected to server.\n");
	printf("Input client's name:");
	if(fgets(sendline,MAXDATASIZE,fp)==NULL){
		printf("\nExit.\n");
		return;
	}
	send(sockfd,sendline,strlen(sendline),0);
	while(getMessage(sendline,MAXDATASIZE,fp)!=NULL){
		send(sockfd,sendline,strlen(sendline),0);
		if((num=recv(sockfd,recvline,MAXDATASIZE,0))==0){
			printf("Server terminated.\n");
			return;
		}
		recvline[num]='\0';
		printf("Server Message:%s\n",recvline);
	}
	printf("\nExit.\n");
}
char* getMessage(char* sendline,int len,FILE* fp){
	printf("Input string to server:");
	return(fgets(sendline,MAXDATASIZE,fp));
}	

运行示例