嵌入式Linux报告.doc

计 算 机 学 院嵌 入 式 程 序 设 计实验报告 班级： * 学号：* 姓名：王增祥 实验分组： B 实验一、开发环境的搭建与配置1、 实验目的1、熟悉嵌入式Linux开发平台。2、掌握嵌入式Linux开发平台的开发环境搭建与配置。3、了解minicon配置过程。4、了解嵌入式系统启动过程5、掌握程序交叉编译过程和调试方式。2、 实验内容1、连接实验板和宿主机2、查看虚拟机配置是否正确3、查看minicom配置是否正确4、在宿主机上编写C语言程序，并且进行交叉编译，然后传输到目标机上进行运行。5、在宿主机上编写C语言程序，进行交叉编译，然后采用gdbserver进行远程调试。3、 实验过程1、打开实验板，用网线和串口线连接宿主机，边切连接电源。2、在桌面打开vmware，进去虚拟机3、检查虚拟机配置是否正确4、进入交叉编译工具5、用vi编辑器打开/etc/profile文件6、在/etc/profile文件中添加一行，保存文件退出。 使用source命令使路径生效。 7、使用which命令来查看路径是否生效，便查看arm-linux-gcc命令的基本信息，验证是否可用 8、在终端输入minicom -s 进入，查看配置是否正确。 9、启动目标版10、启动停止按enter进入系统11、用ifconfig命令把目标机的IP设置为，然后ping命令测试目标机与宿主机的网络连通性。 12、在宿主机的/root/Work目录下用vi命令创建一个文件helloworld.c，编辑后退出并保存。 13、用arm-linux-gcc命令对helloworld.c进行编译。采用file命令查看新生成的文件helloworld的信息。最后产看helloworld能否正确运行。 14、用scp命令把文件helloworld拷贝到目标机/root目录下，然后运行改文件。 15、在宿主机的/root/Work目录下用vi命令创建文件arm_error.c编辑后保存后并退出。 16、使用arm-linux-gcc命令编译arm_error.c 17、用scp命令把arm_error拷贝到目标机的/root目录下。 18、在目标机的/root目录下运行arm_error，查看运行结果。 19、在目标机上启动gdbserver。 20、在宿主机上启动arm-linux-gdb 21、对arm_error进行调试，用list命令列出源程序，用break，命令添加断点，然后用continue命令继续运行程序。 22、用next命令进行单步调试 在调试的过程中，发现问题出在“p0 = e;”语句上。因对一个字符串常量进行修改而发生了段错误。 23、查看目标机的显示信息4、 实验心得 通过这次实验，了解了实验的基本环境，加深了交叉编译的理解。学会了在目标版运行和调试程序的步骤，掌握了基本的调试方法。对Linux操作系统的操作得到了加强，为后面的实验打下了基础。实验二、并发web服务器的实现1、 实验目的1、 熟悉Linux网络编程2、 了解Web服务器原理3、 掌握嵌入式Linux多线程、多进程、I/O多路复用三种并发服务器的实现2、 实验内容1、用多进程实现Web服务器2、用多线程实现Web服务器3、采用I/O多路复用实现Web服务器3、 实验步骤1、打开实验板，进入minicom.2、ifconfig命令把目标机的IP设置为。采用ping命令检测目标机和宿主机的网络连通性。3、把程序源代码拷贝到宿主机的mnt/nfs/web目录下4、用arm-linux-gcc命令编译源程序，得到可执行程序web_server_process5、 用vi文本编辑器创建文件index.html，用于测试Web服务 6、建立文件hello.c，用于测试Web服务器。 7、用命令server启动宿主机上的nfs服务，采用export命令查看nfs的共享目录。8、在宿主机的浏览器中输入：/file查看结果。 9、在宿主机的浏览器中输入查看结果 10、在宿主机的浏览器中输入/index.html，查看执行结果。 11、在宿主机的浏览器中输入/cgi-bin/hello.cgi，查看执行结果。12、 在宿主机的浏览器中输/web_server_process.c，查看执行结果。13、用arm-linux-gcc命令编译源程序，得到可执行程序web_server_thread。14、在目标机中运行web_server_thread。15、在宿主机的浏览器中输入，查看执行结果。16、 在宿主机的浏览器中输入/cgi-bin/hello.cgi查看行结果。17、在宿主机的浏览器中输入/web_server_thread.c，查看执行结果。 18、用arm-linux-gcc命令编译源程序，得到可执行程序web_server_select。 19、在目标机中运行web_server_select。 20、在宿主机的浏览器中输入，查看执行结果。 21、在宿主机的浏览器中输入/cgo-bin/hello.cgi，查看执行结果。 22、在宿主机的浏览器中输入/web_server_select.c4、 实验代码/* web_server_process.c */#include #include #include #include #include #include #include #include #include #include #define BUFSIZE 1024#define MAX_QUE_CONN_NM 5int start_server(int portnum);void sigchld_handler(int sig);int process_request(char *rq, int fd);int resp_cannot_do(int fd);int not_exist(char *f);int resp_do_404(char *item, int fd);int is_a_dir(char *f);int resp_do_ls(char *dir, int fd);int is_a_cgi_file(char *f);int resp_do_exec(char *prog, int fd);int resp_do_cat(char *f, int fd);void pack_header(FILE *fp, char *extension);char *get_filename_extension(char *f);void ignore_others(FILE *fp);int main(int argc, char *argv)int sock;int portnum;int fd;pid_t pid;FILE *fpin;char requestBUFSIZE;if (argc != 2) fprintf(stderr, usage: %s n, argv0);exit(-1);portnum = atoi(argv1);sock = start_server(portnum);signal(SIGCHLD, sigchld_handler);while(1) fd = accept(sock, NULL, NULL);while (pid = fork() = -1);if (pid = 0) fpin = fdopen(fd, r);memset(request, 0, sizeof(request);fgets(request, BUFSIZE, fpin);ignore_others(fpin);process_request(request, fd);fclose(fpin);exit(0);close(fd);close(sock);exit(0);int start_server(int portnum)struct sockaddr_in server_sockaddr, client_sockaddr;int sin_size, recvbytes;int sockfd, client_fd;/* create socket link */if (sockfd = socket(AF_INET, SOCK_STREAM, 0) = -1) perror(socket);exit(-1);server_sockaddr.sin_family = AF_INET;server_sockaddr.sin_port = htons(portnum);server_sockaddr.sin_addr.s_addr = INADDR_ANY;bzero(server_sockaddr.sin_zero, 8);int i = 1;setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &i, sizeof(i);if (bind(sockfd, (struct sockaddr *)&server_sockaddr, sizeof(struct sockaddr) = -1) perror(bind);exit(-1);if (listen(sockfd, MAX_QUE_CONN_NM) = -1)perror(listen);exit(-1);return sockfd;void sigchld_handler(int sig)while (waitpid(-1, 0, WNOHANG) 0);return;int process_request(char *rq, int fd)char cmdBUFSIZE;char argBUFSIZE;strcpy(arg, ./);if (sscanf(rq, %s %s, cmd, arg + 2) != 2) return 1;if (strcmp(cmd, GET) != 0)resp_cannot_do(fd); else if (not_exist(arg) resp_do_404(arg, fd); else if (is_a_dir(arg) resp_do_ls(arg, fd); else if (is_a_cgi_file(arg) resp_do_exec(arg, fd); else resp_do_cat(arg, fd);return 0;int resp_cannot_do(int fd)FILE *fp = fdopen(fd, w);fprintf(fp, HTTP/1.1 501 Not Implementedrn);fprintf(fp, Content-type: text/plainrn);fprintf(fp, rn);fprintf(fp, That command is not yet implementedrn);fclose(fp);return 0;int not_exist(char *f)struct stat info;return (stat(f, &info) = -1);int resp_do_404(char *item, int fd)FILE *fp = fdopen(fd, w);fprintf(fp, HTTP/1.1 404 Not Foundrn);fprintf(fp, Content-type: text/plainrn);fprintf(fp, rn);fprintf(fp, The item you requested: %srnis not foundrn, item);fclose(fp);return 0;int is_a_dir(char *f)struct stat info;return (stat(f, &info) != -1 & S_ISDIR(info.st_mode);int resp_do_ls(char *dir, int fd)FILE *fp = fdopen(fd, w);pack_header(fp, text/plain);fprintf(fp, rn);fflush(fp);dup2(fd, 1);dup2(fd, 2);close(fd);execlp(ls, ls, -l, dir, NULL);perror(dir);return 0;int is_a_cgi_file(char *f)return(strcmp(get_filename_extension(f), cgi) = 0);int resp_do_exec(char *prog, int fd)FILE *fp = fdopen(fd, w);pack_header(fp, NULL);fflush(fp);dup2(fd, 1);dup2(fd, 2);close(fd);execl(prog, prog, NULL);perror(prog);return 0;int resp_do_cat(char *f, int fd)char *extension = get_filename_extension(f);char *content = text/plain;FILE *fpsock, *fpfile;int c;if (strcmp(extension, html) = 0) content = text/html; else if (strcmp(extension, gif) = 0) content = text/gif; else if (strcmp(extension, jpg) = 0) content = text/jpg; else if (strcmp(extension, jpeg) = 0) content = text/jpeg;fpsock = fdopen(fd, w);fpfile = fopen(f, r);if (fpsock != NULL & fpfile != NULL) pack_header(fpsock, content);fprintf(fpsock, rn);while (c = getc(fpfile) != EOF) putc(c, fpsock);fclose(fpfile);fclose(fpsock);return 0;return 1;void pack_header(FILE *fp, char *extension)fprintf(fp, HTTP/1.1 200 OKrn);if (extension)fprintf(fp, Content-type: %srn, extension);char *get_filename_extension(char *f)return strrchr(f, .) + 1; void ignore_others(FILE *fp)char bufBUFSIZE;fgets(buf, BUFSIZE, fp);while(strcmp(buf, rn) fgets(buf, BUFSIZE, fp);return; 1. 多进程Web服务器 2、 多线程Web服务器/* web_server_thread.c */#include #include #include #include #include #include #include #include #include #include #include #define BUFSIZE 1024#define MAX_QUE_CONN_NM 10void *thread(void *vargp);int start_server(int portnum);int process_request(int fd);int resp_cannot_do(int fd);int not_exist(char *f);int resp_do_404(char *item, int fd);int is_a_dir(char *f);int resp_do_ls(char *dir, int fd);int is_a_cgi_file(char *f);int resp_do_exec(char *prog, int fd);int resp_do_cat(char *f, int fd);void pack_header(FILE *fp, char *extension);char *get_filename_extension(char *f);void ignore_others(FILE *fp);int main(int argc, char *argv)int sock;int portnum;int *fd;pthread_t tid;if (argc != 2) fprintf(stderr, usage: %s n, argv0);exit(-1);portnum = atoi(argv1);sock = start_server(portnum);while(1) fd = malloc(sizeof(int);*fd = accept(sock, NULL, NULL);pthread_create(&tid, NULL, thread, fd);close(sock);exit(0);int start_server(int portnum)struct sockaddr_in server_sockaddr;int sockfd;/* create socket link */if (sockfd = socket(AF_INET, SOCK_STREAM, 0) = -1) perror(socket);exit(-1);server_sockaddr.sin_family = AF_INET;server_sockaddr.sin_port = htons(portnum);server_sockaddr.sin_addr.s_addr = INADDR_ANY;bzero(server_sockaddr.sin_zero, 8);int i = 1;setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &i, sizeof(i);if (bind(sockfd, (struct sockaddr *)&server_sockaddr, sizeof(struct sockaddr) = -1) perror(bind);exit(-1);if (listen(sockfd, MAX_QUE_CONN_NM) = -1)perror(listen);exit(-1);return sockfd;void *thread(void *vargp)int fd = *(int *)vargp);pthread_detach(pthread_self();free(vargp);process_request(fd);close(fd);return;int process_request(int fd)char requestBUFSIZE, cmdBUFSIZE, argBUFSIZE;FILE *fpin;fpin = fdopen(fd, r);fgets(request, BUFSIZE, fpin);ignore_others(fpin);strcpy(arg, ./);if (sscanf(request, %s %s, cmd, arg + 2) != 2) return 1;if (strcmp(cmd, GET) != 0)resp_cannot_do(fd); else if (not_exist(arg) resp_do_404(arg, fd); else if (is_a_dir(arg) resp_do_ls(arg, fd); else if (is_a_cgi_file(arg) resp_do_exec(arg, fd); else resp_do_cat(arg, fd);fclose(fpin);return 0;int resp_cannot_do(int fd)FILE *fp = fdopen(fd, w);fprintf(fp, HTTP/1.1 501 Not Implementedrn);fprintf(fp, Content-type: text/plainrn);fprintf(fp, rn);fprintf(fp, That command is not yet implementedrn);fclose(fp);return 0;int not_exist(char *f)struct stat info;return (stat(f, &info) = -1);int resp_do_404(char *item, int fd)FILE *fp = fdopen(fd, w);fprintf(fp, HTTP/1.1 404 Not Foundrn);fprintf(fp, Content-type: text/plainrn);fprintf(fp, rn);fprintf(fp, The item you requested: %srnis not foundrn, item);fclose(fp);return 0;int is_a_dir(char *f)struct stat info;return (stat(f, &info) != -1 & S_ISDIR(info.st_mode);int resp_do_ls(char *dir, int fd)pid_t pid;FILE *fp = fdopen(fd, w);pack_header(fp, text/plain);fprintf(fp, rn);fflush(fp);while (pid = fork() = -1);if (pid = 0) dup2(fd, 1);dup2(fd, 2);close(fd);execlp(ls, ls, -l, dir, NULL);perror(dir);waitpid(pid, NULL, 0);return 0;int is_a_cgi_file(char *f)return(strcmp(get_filename_extension(f), cgi) = 0);int resp_do_exec(char *prog, int fd)pid_t pid;FILE *fp = fdopen(fd, w);pack_header(fp, NULL);fflush(fp);while (pid = fork() = -1);if (pid = 0) dup2(fd, 1);dup2(fd, 2);close(fd);execl(prog, prog, NULL);perror(prog);waitpid(pid, NULL, 0);return 0;int resp_do_cat(char *f, int fd)int flag = 1;char *extension = get_filename_extension(f);char *content = text/plain;FILE *fpsock, *fpfile;int c;if (strcmp(extension, html) = 0) content = text/html; else if (strcmp(extension, gif) = 0) content = text/gif; else if (strcmp(extension, jpg) = 0) content = text/jpg; else if (strcmp(extension, jpeg) = 0) content = text/jpeg;fpsock = fdopen(fd, w);fpfile = fopen(f, r);if (fpsock != NULL & fpfile != NULL) pack_header(fpsock, content);fprintf(fpsock, rn);while (c = getc(fpfile) != EOF) putc(c, fpsock);fclose(fpfile);fclose(fpsock);flag = 0;return flag;void pack_header(FILE *fp, char *extension)fprintf(fp, HTTP/1.1 200 OKrn);if (extension)fprintf(fp, Content-type: %srn, extension);char *get_filename_extension(char *f)return strrchr(f, .) + 1; void ignore_others(FILE *fp)char bufBUFSIZE;fgets(buf, BUFSIZE, fp);while(strcmp(buf, rn) fgets(buf, BUFSIZE, fp);return; 3. I/O多路复用方式的Web服务器/* web_server_select.c */#include #include #include #include #include #include #include #include #include #include #include #define BUFSIZE 1024#define MAX_QUE_CONN_NM 5typedef struct int maxfd;fd_set read_set;fd_set ready_set;int nready;int maxi;int clientfdFD_SETSIZE;char requestFD_SETSIZEBUFSIZE;int lenFD_SETSIZE; pool;int start_server(int portnum);void init_pool(int sockfd, pool *p);void add_client(int connfd, pool *p);void check_clients(pool *p);int process_request(char *rq, int fd);int resp_cannot_do(int fd);int not_exist(char *f);int resp_do_404(char *item, int fd);int is_a_dir(char *f);int resp_do_ls(char *dir, int fd);int is_a_cgi_file(char *f);int resp_do_exec(char *prog, int fd);int resp_do_cat(char *f, int fd);void pack_header(FILE *fp, char *extension);char *get_filename_extension(char *f);int main(int argc, char *argv)int sock;int fd;int portnum;static pool pool;FILE *fpin;int i = 1;if (argc != 2) fprintf(stderr, usage: %s n, argv0);exit(-1);portnum = atoi(argv1);sock = start_server(portnum);init_pool(sock, &pool);while(1) pool.ready_set = pool.read_set;pool.nready = select(pool.maxfd + 1, &pool.ready_set, NULL, NULL, NULL);if ( pool.nready= -1) perror(select);exit(-1);if (FD_ISSET(sock, &pool.ready_set) if (fd = accept(sock, NULL, NULL) = -1) perror(accept);close(sock);exit(-1);add_client(fd, &pool);check_clients(&pool);int start_server(int portnum)struct sockaddr_in server_sockaddr, client_sockaddr;int sin_size, recvbytes;int sockfd, client_fd;/* create socket link */if (sockfd = socket(AF_INET, SOCK_STREAM, 0) = -1) perror(socket);exit(-1);server_sockaddr.sin_family = AF_INET;server_sockaddr.sin_port = htons(portnum);server_sockaddr.sin_addr.s_addr = INADDR_ANY;bzero(server_sockaddr.sin_zero, 8);int i = 1;setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &i, sizeof(i);if (bind(sockfd, (struct sockaddr *)&server_sockaddr, sizeof(struct sockaddr) = -1) perror(bind);exit(-1);if (listen(sockfd, MAX_QUE_CONN_NM) = -1)perror(listen);exit(-1);return sockfd;void init_pool(int sockfd, pool *p)int i;p-maxi = -1;for(i = 0; i clientfdi = -1;p-maxfd = sockfd;FD_ZERO(&p-read_set);FD_SET(sockfd, &p-read_set);void add_client(int connfd, pool *p)int i;p-nready-;for (i = 0; i clientfdi clientfdi = connfd;memset(p-requesti, 0, BUFSIZE);p-leni = 0;FD_SET(connfd, &p-read_set);if (connfd p-maxfd)p-maxfd = connfd;if (i p-maxi)p-maxi = i;break;if (i = FD_SETSIZE)printf(add_client error: Too many clientsn);void check_clients(pool *p)int i;int connfd;int n;int ret;char bufBUFSIZE;char *q;for (i=0; (imaxi)&(p-nready0); i+) connfd = p-clientfdi;if (connfd 0) & (FD_ISSET(connfd, &p-ready_set) p-nready-;ret = read(connfd, p-requesti+p-leni, BUFSIZE);if (ret = -1)