嵌入式操作系统期末必考程序.doc

/ hello.c#include #include #include static int _init hello_init(void)printk(KERN_ALERT Hello World！n);return 0;static void _exit hello_exit(void) printk(KERN_ALERT Goodbye World！n);module_init(hello_init);module_exit(hello_exit);MODULE_LICENSE(GPL); Dual BSD/GPL/*tcpserver.c*/1.#include2.#include3.#include4.#include5.#include6.#include7.#include8.# main(int argc,char *argv)10.11.int sockfd,new_fd;12.struct sockaddr_in server_addr;13.struct sockaddr_in client_addr;14.int sin_size,portnumber;15.const char hello=Hellon;16.if(argc!=2)17.18. fprintf(stderr,Usage:%s portnumberan,argv0);19. exit(1);20.21.if(portnumber=atoi(argv1)0)22.23. fprintf(stderr,Usage:%s portnumberan,argv0);24. exit(1);25. 26. /*服务器端开始建立socket描述符*/27.if(sockfd=socket(AF_INET,SOCK_STREAM,0)=1)28.29. fprintf(stderr,Socket error:%s portnumberan,strerror(errno);30. exit(1);31. 32. /*服务器端填充sockaddr结构*/33.bzero(&server_addr,sizeof(struct sockaddr_in);34.server_addr.sin_family=AF_INET;35.server_addr.sin_addr.s_addr=htonl(INADDR_ANY);36.server_addr.sin_port=htons(portnumber);37./*捆绑sockfd描述符*/if(bind(sockfd,(struct sockaddr *)(&server_addr),sizeof(struct 38.sockaddr)=-1)39.40. fprintf(stderr,Bind error:%sna,strerror(errno);41. exit(1);42. 43./*监听sockfd描述符*/44.if(listen(sockfd,5)=-1)45.46. fprintf(stderr,Listen error:%sna,strerror(errno);47. exit(1);48.49.while(1)50.51. /*服务器阻塞，直到客户程序建立连接*/52.sin_size=sizeof(struct sockaddr_in);53.if(new_fd=accept(sockfd,(struct 54.sockaddr )(&client_addr),&sin_size)=-1)55.56. fprintf(stderr,Accept error: %sna,strerror(errno);57. exit(1);58. 59. fprintf(stderr,Server get connection from%sn, 60.inet_ntoa(client_addr.sin_addr);61. if(write(new_fd,hello,strlen(hello)=-1)62. 63. fprintf(stderr,Write Error:%sn,strerror(errno);64. exit(1);65. 66. /*这个通信已经结束*/67. close(new_fd);68. /*循环下一个*/69. 70. close(sockfd);71. exit(0); /*tcpclient.c1. #include2. #include3. #include4. #include5. #include6. #include7. #include8. #include9. int main(int argc,char *argv)10. 11. int sockfd;12. char buffer1024;13. struct sockaddr_in server_addr;14. struct hostent *host;15. int portnumber,nbytes;16. if(argc!=3)17. 18. fprintf(stderr,Usage:%s hostname portnumberan,argv0);19. exit(1);20. 21. if(host=gethostbyname(argv1)=NULL)22. server_addr.sin_family=AF_INET;23. server_addr.sin_port=htons(portnumber);24. server_addr.sin_addr=*(struct in_addr*)host-h_addr);25. /*客户程序发起连接请求*/26. if(connect(sockfd,(struct sockaddr*)(&server_addr), sizeof(struct sockaddr)=-1)27. 28. fprintf(stderr,Connect Error:%sna,strerror(errno);29. exit(1);30. 31. /*连接成功了*/32. if(nbytes=read(sockfd,buffer,1024)=-1)33. 34. fprintf(stderr,Read Error: %sna,strerror(errno); 35. exit(1);36. 37. buffernbytes=0;38. printf(I have received:%sn,buffer);39. /*结束通信*/40. close(sockfd);41. exit(0);42. rootJLUZH tcp#tcpserver 2000rootJLUZH tcp#tcpclient localhost 2000此时，在终端一会显示：“Server get connection from ”，表示tcpserver程序收到了从来的连接信息。在终端二会显示：“I have received:Hello”，表示tcpclient程序收到了从服务器端发送来的信息。/*udpserver.c*/#include #include #include #include #include #include #define MAXLINE 80#define SERV_PORT 8888void do_echo(int sockfd, struct sockaddr *pcliaddr, socklen_t clilen) int n; socklen_t len; char mesg80; for(;) len = clilen; n = recvfrom(sockfd, mesg, 80, 0, pcliaddr, &len); /* 等待接收数据 */ sendto(sockfd, mesg, n, 0, pcliaddr, len); /* 将接收到的数据发送回去 */ mesgn=0; fputs(mesg, stdout); /*main函数*/int main(void) int sockfd; struct sockaddr_in servaddr, cliaddr; sockfd = socket(AF_INET, SOCK_DGRAM, 0); /* 创建socket */ bzero(&servaddr, sizeof(servaddr); /* 初始化servaddr */servaddr.sin_family = AF_INET;servaddr.sin_addr.s_addr=htonl(INADDR_ANY);/*定义为INADDR_ANY*/ servaddr.sin_port = htons(8888); if(bind(sockfd, (struct sockaddr *)&servaddr, sizeof(servaddr) = -1) /* 绑定IP地址和端口*/ perror(bind error); exit(1); do_echo(sockfd, (struct sockaddr *)&cliaddr, sizeof(cliaddr); return 0;/*udpclient.c*/#include #include #include #include #include #include #include #include #define MAXLINE 80#define SERV_PORT 8888void do_cli(FILE *fp, int sockfd, struct sockaddr *pservaddr, socklen_t servlen) int n; char sendline80, recvline80 + 1; if(connect(sockfd, (struct sockaddr *)pservaddr, servlen) = -1) /* 连接服务器 */ perror(connect error); exit(1); while(fgets(sendline, 80, fp) != NULL) write(sockfd, sendline, strlen(sendline);/*读一行并发送到服务器*/ n = read(sockfd, recvline, 80); /* 接收从服务器来的数据 */ if(n = -1) perror(read error); exit(1); recvlinen = 0; /* terminate string */ fputs(recvline, stdout); /*main函数*/int main(int argc, char *argv) int sockfd; struct sockaddr_in servaddr; if(argc != 2) /* 输入参数检查 */ printf(usage: udpclient n); exit(1); bzero(&servaddr, sizeof(servaddr); /*初始化servaddr */servaddr.sin_family = AF_INET;servaddr.sin_port = htons(8888);if(inet_pton(AF_INET, argv1, &servaddr.sin_addr) = 0)printf(%s is not a valid IPaddressn, argv1); exit(1); sockfd = sock