include

include

include

include

include

include

include

include

define MY_PORT 3333

int main(int argc ,char **argv)
{
int listen_fd,accept_fd;
struct sockaddr_in client_addr;
int n;
int nbytes;

if((listen_fd=socket(AF_INET,SOCK_STREAM,0))<0)  
{  
        printf("Socket Error:%s\n\a",strerror(errno));  
        exit(1);  
}  

bzero(&client_addr,sizeof(struct sockaddr_in));  
client_addr.sin_family=AF_INET;  
client_addr.sin_port=htons(MY_PORT);  
client_addr.sin_addr.s_addr=htonl(INADDR_ANY);  
n=1;  

/* 如果伺服器終止後,伺服器可以第二次快速啟動而不用等待一段時間  */  
setsockopt(listen_fd,SOL_SOCKET,SO_REUSEADDR,&n,sizeof(int));  
if(bind(listen_fd,(struct sockaddr *)&client_addr,sizeof(client_addr))<0)  
{  
        printf("Bind Error:%s\n\a",strerror(errno));  
        exit(1);  
}  

listen(listen_fd,5);  

while(1)  
{  
    accept_fd=accept(listen_fd,NULL,NULL);  
    if((accept_fd<0)&&(errno==EINTR))  
            continue;  
    else if(accept_fd<0)  
        {  
            printf("Accept Error:%s\n\a",strerror(errno));  
            continue;  
        }  
    if((n=fork())==0)  
    {  
            /* 子程序處理客戶端的連線 */  
            char buffer[1024];  

            if((nbytes=read(accept_fd,buffer,1024))==-1)   
        {   
            fprintf(stderr,"Read Error:%s\n",strerror(errno));   
            exit(1);   
        }         
        buffer[nbytes]='\0';  
        printf("Server received %s\n",buffer);  

            close(listen_fd);  
            close(accept_fd);  
            exit(0);  
    }  
    else   
        close(accept_fd);  
}  
 

}