tcp_server.c服务模型

 

#include <stdlib.h>#include <stdio.h>#include <errno.h>#include <string.h>#include <netdb.h>#include <sys/types.h>#include <netinet/in.h>#include <sys/socket.h>#define portnumber 3333int main(int argc ,char *argv[]){int sockfd,new_fd;struct sockaddr_in server_addr;struct sockaddr_in client_addr;int sin_size;int nbytes;char buffer[1024];/*服务器端开始建立sockfd描述符*/if((sockfd=socket(AF_INET,SOCK_STREAM,0))==-1){fprintf(stderr,"Socket error:%s\n\a",strerror(errno));exit(1);}/*服务器端填充sockaddr结构*/bzero(&server_addr,sizeof(struct sockaddr_in)); //初始化,置0server_addr.sin_family=AF_INET;   //internetserver_addr.sin_addr.s_addr=htonl(INADDR_ANY);//将本机上的long数据转化为网络上的long数据//server_addr.sin_addr.s_addr=inet_addr("192.168.1.1");//用于绑定一个固定ip.inet_addrserver_addr.sin_port=htons(portnumber);//将本机上的short数据转化为网络上的short数据/*捆绑sockfd描述符到ip地址*/if(bind(sockfd,(struct sockaddr *)(&server_addr),sizeof(struct sockaddr))==-1){fprintf(stderr,"Bind error:%s\n\a",strerror(errno));exit(1);}/*设置允许连接的最大客户端数*/if(listen(sockfd,5)==-1){fprintf(stderr,"Listen errr:%s\n\a",strerror(errno));exit(1);}while(1){/*服务器阻塞，直到有客户程序建立连接*/sin_size=sizeof(struct sockaddr_in);if((new_fd=accept(sockfd,(struct sockaddr *)(&client_addr),&sin_size))==-1){fprintf(stderr,"Accept error:%s\n\a",strerror(errno));            exit(1);}fprintf(stderr,"Server get connection from %s\n",inet_ntoa(client_addr.sin_addr));if((nbytes=read(new_fd,buffer,1024))==-1){   fprintf(stderr,"Read Error:%s\n",strerror(errno));   exit(1);}buffer[nbytes]='\0';printf("Server received %s\n",buffer);/*这个通讯已经结束*/close(new_fd);/*循环下一个*/}/*结束通讯*/}