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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提供服务。要求：服务器：接收客户连接请求，并打印客户IP地址及端口号，然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所有字符。客户：从命令行接收服务器地址，并向服务器发起连接请求，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 #include #define PORT 9999#define BACKLOG5#define MAXDATASIZE1000typedef struct CLIENT int fd;char*name;structsockaddr_in addr;char*data;CLIENT;void process_cli(struct CLIENT *client, char *recvbuf, int len);void savedata(char *recvbuf, int len, char *data);int main(void) int i, maxi, maxfd, sockfd;int nready;ssize_t n;fd_set rset, allset;int listenfd, connectfd;struct sockaddr_in server;struct CLIENT clientFD_SETSIZE;char recvbufMAXDATASIZE;int sin_size;if(listenfd=socket(AF_INET, SOCK_STREAM, 0)=-1)perror(Create 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(struct sockaddr)=-1) perror(Bind error.);exit(-1);if (listen(listenfd, BACKLOG) = -1) perror(listen error.);exit(-1);sin_size = sizeof(struct sockaddr_in);maxfd = listenfd;maxi = -1; for (i =0; i FD_SETSIZE; i+)clienti.fd = -1;FD_ZERO(&allset);FD_SET(listenfd, &allset);while (1) struct sockaddr_in addr;rset = allset;nready = select (maxfd+1, &rset, NULL, NULL, NULL);if (FD_ISSET(listenfd, &rset) if (connectfd = accept(listenfd, (struct sockaddr *)&addr, &sin_size) = -1) perror(accept error.);continue; for (i = 0; i FD_SETSIZE; i+) if (clienti.fd maxfd) maxfd = connectfd;if (i maxi) maxi =i;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, recvbuf, MAXDATASIZE, 0) =0) close(sockfd);printf(Client (%s) closed connection. Users data: %sn, clienti.name, clienti.data); FD_CLR(sockfd, &allset);clienti.fd = -1;free(clienti.name);free(clienti.data); else process_cli(&clienti, recvbuf, n);if ( -nready name) = 0) memcpy(client-name,recvbuf, len); printf(Clientsname is %s.n,client-name); return; printf(Receivedclient( %s ) message: %sn,client-name, recvbuf); savedata(recvbuf,len,client-data); for (i1 = 0; i1fd,sendbuf,strlen(sendbuf),0);void savedata(char *recvbuf, int len, char *data) int start =strlen(data); int i; for (i = 0; i len; i+) datastart + i= recvbufi; 客户端：#include #include #include #include #include #include #include #define PORT 9999#define MAXDATASIZE100int main(int argc, char *argv)int fd, numbytes;char bufMAXDATASIZE;struct hostent * he;struct sockaddr_in server; int i=1;if (argc != 2)printf(Usage: %s n, argv0);exit(-1); if (he = gethostbyname(argv1) = NULL) perror(gethostbyname error.); exit(-1); if (fd = socket(AF_INET, SOCK_STREAM, 0) = -1) perror(Create socket failed.);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 (i=connect(fd, (struct sockaddr *)&server, sizeof(struct sockaddr) = -1) perror(connect failed.);exit(1);if( (numbytes = recv(fd, buf, MAXDATASIZE, 0) = -1) perror(recv error.);exit(1);bufnumbytes = 0;printf(Server Message: %s,buf); printf(Please input your name:); scanf(%s,buf); if( (numbytes = send(fd, buf, strlen(buf), 0) = -1) perror(send error.);exit(1); while(1) printf(Please input message(max char:%d):,MAXDATASIZE); scanf(%s,buf); if(strlen(buf)1) i=0; if( (numbytes = send(fd, buf, strlen(buf), 0) = -1) perror(send error.);exit(1); if( (numbytes = recv(fd, buf, MAXDATASIZE, 0) = -1) perror(read error.);exit(1); bufnumbytes = 0; close(fd);实验结果：服务器：客户端1：客户端2：
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