linux网络编程(编程初步)

时间:2014-03-14 17:25:33
【文件属性】:

文件名称:linux网络编程(编程初步)

文件大小:192KB

文件格式:PDF

更新时间:2014-03-14 17:25:33

网络编程初步

适合初学者,如 /******* 服务器程序 (server.c) ************/ #include ; #include ; #include ; #include ; #include ; #include ; #include ; #include ; int main(int argc, char *argv[]) { int sockfd,new_fd; struct sockaddr_in server_addr; struct sockaddr_in client_addr; int sin_size,portnumber; char hello[]="Hello! Are You Fine?\n"; if(argc!=2) { fprintf(stderr,"Usage:%s portnumber\a\n",argv[0]); exit(1); } if((portnumber=atoi(argv[1]))<0) { fprintf(stderr,"Usage:%s portnumber\a\n",argv[0]); exit(1); } /* 服务器端开始建立socket 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)); server_addr.sin_family=AF_INET; server_addr.sin_addr.s_addr=htonl(INADDR_ANY); server_addr.sin_port=htons(portnumber); /* 捆绑sockfd 描述符 */ if(bind(sockfd,(struct sockaddr *)(&server_addr),sizeof(struct sockaddr))== -1) { fprintf(stderr,"Bind error:%s\n\a",strerror(errno)); exit(1); } /* 监听sockfd 描述符 */ if(listen(sockfd,5)==-1) { fprintf(stderr,"Listen error:%s\n\a",strerror(errno)); exit(1); } while(1) { /* 服务器阻塞,直到客户程序建立连接 */ 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(write(new_fd,hello,strlen(hello))==-1) { fprintf(stderr,"Write Error:%s\n",strerror(errno)); exit(1); } /* 这个通讯已经结束 */ close(new_fd); /* 循环下一个 */ } close(sockfd); exit(0); } /******* 客户端程序 client.c ************/ #include ; #include ; #include ; #include ; #include ; #include ; #include ; #include ; int main(int argc, char *argv[]) { int sockfd; char buffer[1024]; struct sockaddr_in server_addr; struct hostent *host; int portnumber,nbytes; if(argc!=3) { fprintf(stderr,"Usage:%s hostname portnumber\a\n",argv[0]); exit(1); } if((host=gethostbyname(argv[1]))==NULL) { fprintf(stderr,"Gethostname error\n"); exit(1); } if((portnumber=atoi(argv[2]))<0) { fprintf(stderr,"Usage:%s hostname portnumber\a\n",argv[0]); exit(1); } /* 客户程序开始建立 sockfd 描述符 */ if((sockfd=socket(AF_INET,SOCK_STREAM,0))==-1) { fprintf(stderr,"Socket Error:%s\a\n",strerror(errno)); exit(1); } /* 客户程序填充服务端的资料 */ bzero(&server_addr,sizeof(server_addr)); server_addr.sin_family=AF_INET; server_addr.sin_port=htons(portnumber); server_addr.sin_addr=*((struct in_addr *)host->;h_addr); /* 客户程序发起连接请求 */ if(connect(sockfd,(struct sockaddr *)(&server_addr),sizeof(struct sockaddr) )==-1) { fprintf(stderr,"Connect Error:%s\a\n",strerror(errno)); exit(1); } /* 连接成功了 */ if((nbytes=read(sockfd,buffer,1024))==-1) { fprintf(stderr,"Read Error:%s\n",strerror(errno)); exit(1); } buffer[nbytes]='\0'; printf("I have received:%s\n",buffer); /* 结束通讯 */ close(sockfd); exit(0); }


网友评论