电子科技大学网络编程作业(IO复用)4

1、电子科技大学网络编程作业(IO复用)4.网络编程作业4作业要求：服务器利用I/O复用技术，实现同时向多个客户供给服务。要求：服务器：接收客户连接央求，并打印客户IP地址及端口号，尔后接收客户发来的字符串，并打印该字符串和其来自与哪个客户。同时向客户返回该字符串。当某一客户断开连接时，要求服务器打印该客户输入的全部字符。客户：从命令行接收伏务器地址，并向服务器倡议连接央求，连接成功后，从标准输入接收字符串并发送给服务器，等待服务器响应并打印接收的信息。程序：服务器端：#include#include#include#include#include#include#include#include#

2、include专业.专注.电子科技大学网络编程作业(IO复用)4.#definePORT9999#defineBACKLOG5#defineMAXDATASIZE1000typedefstructCLIENTintfd;char*name;structsockaddr_inaddr;char*data;CLIENT;voidprocess_cli(structCLIENT*client,char*recvbuf,intlen);voidsavedata(char*recvbuf,intlen,char*data);intmain(void)inti,maxi,maxfd,sockfd;intn

3、ready;ssize_tn;fd_setrset,allset;intlistenfd,connectfd;structsockaddr_inserver;structCLIENTclientFD_SETSIZE;charrecvbufMAXDATASIZE;intsin_size;专业.专注.电子科技大学网络编程作业(IO复用)4.if(listenfd=socket(AF_INET,SOCK_STREAM,0)=-1)perror(Createsocketfailed.);exit(-1);intopt=SO_REUSEADDR;setsockopt(listenfd,SOL_SOCKE

4、T,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,(structsockaddr*)&server,sizeof(structsockaddr)=-1)perror(Binderror.);exit(-1);if(listen(listenfd,BACKLOG)=-1)perror(listenerro

5、r.);专业.专注.电子科技大学网络编程作业(IO复用)4.exit(-1);sin_size=sizeof(structsockaddr_in);maxfd=listenfd;maxi=-1;for(i=0;iFD_SETSIZE;i+)clienti.fd=-1;FD_ZERO(&allset);FD_SET(listenfd,&allset);while(1)structsockaddr_inaddr;rset=allset;nready=select(maxfd+1,&rset,NULL,NULL,NULL);if(FD_ISSET(listenfd,&rset)if(connectf

6、d=accept(listenfd,(structsockaddr*)&addr,&sin_size)=-1)perror(accepterror.);continue;for(i=0;iFD_SETSIZE;i+)if(clienti.fdmaxfd)maxfd=connectfd;if(imaxi)maxi=i;专业.专注.电子科技大学网络编程作业(IO复用)4.if(-nready=0)continue;for(i=0;i=maxi;i+)if(sockfd=clienti.fd)0)continue;if(FD_ISSET(sockfd,&rset)if(n=recv(sockfd,r

7、ecvbuf,MAXDATASIZE,0)=0)close(sockfd);printf(Client(%s)closedconnection.Userdata:%sn,,clienti.data);FD_CLR(sockfd,&allset);clienti.fd=-1;free();free(clienti.data);elseprocess_cli(&clienti,recvbuf,n);if(-nreadyname)=0)memcpy(client-name,recvbuf,len);printf(Clientsnameis%s.n,cl

8、ient-name);return;printf(Receivedclient(%s)message:%sn,client-name,recvbuf);savedata(recvbuf,len,client-data);for(i1=0;i1fd,sendbuf,strlen(sendbuf),0);voidsavedata(char*recvbuf,intlen,char*data)专业.专注.电子科技大学网络编程作业(IO复用)4.intstart=strlen(data);inti;for(i=0;ilen;i+)datastart+i=recvbufi;客户端：#include#inc

9、lude#include#include#include#include#include#definePORT9999#defineMAXDATASIZE100intmain(intargc,char*argv)intfd,numbytes;charbufMAXDATASIZE;structhostent*he;专业.专注.电子科技大学网络编程作业(IO复用)4.structsockaddr_inserver;inti=1;if(argc!=2)printf(Usage:%sn,argv0);exit(-1);if(he=gethostbyname(argv1)=NULL)perror(get

10、hostbynameerror.);exit(-1);if(fd=socket(AF_INET,SOCK_STREAM,0)=-1)perror(Createsocketfailed.);exit(1);bzero(&server,sizeof(server);server.sin_family=AF_INET;专业.专注.电子科技大学网络编程作业(IO复用)4.server.sin_port=htons(PORT);server.sin_addr=*(structin_addr*)he-h_addr);if(i=connect(fd,(structsockaddr*)&server,size

11、of(structsockaddr)=-1)perror(connectfailed.);exit(1);if(numbytes=recv(fd,buf,MAXDATASIZE,0)=-1)perror(recverror.);exit(1);bufnumbytes=0;printf(ServerMessage:%s,buf);printf(Pleaseinputyourname:);scanf(%s,buf);if(numbytes=send(fd,buf,strlen(buf),0)=-1)perror(senderror.);专业.专注.电子科技大学网络编程作业(IO复用)4.exit(1);while(1)printf(Pleaseinputmessage(maxchar:%d):,MAXDATASIZE);scanf(%s,buf);if(strlen(buf)1)i=0;if(numbytes=send(fd,buf,strlen(buf),0)=-1)perror(senderror