[资料]

linux 关于socket的一个简单应用

2015-11-13 12:52:08 2961

0 自己临时写的一个小应用，手机端发送一个字符，服务器进行判断，然后控制led，差不多像是第一次接触51单片机的那个点灯程序。应用程序 #include #include #include #include tinet/in.h> #include #include #include #include #include #include #include #include #include #define MYPORT 8887 #define QUEUE 20 #define BUFFER_SIZE 1024 char buffer1[]="test successn" ; int change,test_flag=0; int fd; int server_sockfd; char buffer[BUFFER_SIZE]; int conn; int function1() { change=8; printf("enter function1n"); //int fd; /* 1.打开设备节点 / fd = open("/dev/xiaoqikeji", O_RDWR \| O_NONBLOCK); //注意fd 下面将用到既读又写模式非阻塞模式 if (fd < 0) { printf("can't open!n"); return -1; } ///定义sockfd server_sockfd = socket(AF_INET,SOCK_STREAM, 0); ///定义sockaddr_in struct sockaddr_in server_sockaddr; server_sockaddr.sin_family = AF_INET; server_sockaddr.sin_port = htons(MYPORT); server_sockaddr.sin_addr.s_addr = htonl(INADDR_ANY); // 设置套接字选项避免地址使用错误 int on=1; if((setsockopt(server_sockfd,SOL_SOCKET,SO_REUSEADDR,&on,sizeof(on)))<0) { perror("setsockopt failed"); exit(1); } ///bind，成功返回0，出错返回-1 if(bind(server_sockfd,(struct sockaddr )&server_sockaddr,sizeof(server_sockaddr))==-1) { //test_flag++; //标志位 perror("bind"); //system("mysocket1"); //printf("try again"); //if(test_flag==3) exit(1); //如果连了三次还是如此则退出整个函数 //return 0; } ///listen，成功返回0，出错返回-1 if(listen(server_sockfd,QUEUE) == -1) { perror("listen"); exit(1); } ///客户端套接字 //char buffer[BUFFER_SIZE]; struct sockaddr_in client_addr; socklen_t length = sizeof(client_addr); ///成功返回非负描述字，出错返回-1 conn = accept(server_sockfd, (struct sockaddr)&client_addr, &length); if(conn<0) { perror("connect"); exit(1); } change=1; printf("exit function1n"); //return 0; } int function2() { printf("enter function2n"); while(1) { test_flag=0; //标志位清零 printf("enter while functionn"); memset(buffer,0,sizeof(buffer)); int len = recv(conn, buffer, sizeof(buffer),0); if(!(strncmp(buffer,"exit",4 ))) //if(buffer[0]=='0') { printf("exit whole functionn"); change=8; //退出整个函数 break; } if(buffer[0]=='') { printf("exit success and you can link againn"); change=0; //退出function2函数 break; } fputs(buffer, stdout); fputs("recv successn",stdout); if(buffer[0]=='a') ioctl(fd, 0); if(buffer[0]=='b') ioctl(fd, 1); if(buffer[0]=='c') ioctl(fd, 2); if(buffer[0]=='d') ioctl(fd, 3); if(buffer[0]=='e') ioctl(fd, 4); if(buffer[0]=='f') ioctl(fd, 5); if(buffer[0]=='g') ioctl(fd, 6); if(buffer[0]=='h') ioctl(fd, 7); if(buffer[0]=='0') system("/etc/init.d/mjpg-streamer stop"); if(buffer[0]=='1') { //char bufferstart[]="mjpg_streamer -i "input_uvc.so -f 15 -r 320240 -d /dev/video0" -o "output_http.so -p 8080 -w /www/camwww""; //system(bufferstart); system("/etc/init.d/mjpg-streamer start"); } printf("%s",buffer1); send(conn, buffer, len, 0); send(conn,buffer1,sizeof(buffer1),0); } close(conn); close(server_sockfd); printf("exit function2n"); return 0; } int main() { change=0; while(1) { switch(change) { case 0: function1(); break; case 1: function2(); break; case 2: break; case 3: break; case 4: break; case 5: break; case 6: break; case 7: break; default: break; } if(change==8) break; } close(conn); close(server_sockfd); printf("exit mainn"); return 0; } 驱动程序 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include volatile unsigned long GPIOMODE; volatile unsigned long GPIO21_0_DIR; volatile unsigned long GPIO21_0_DATA; static struct class xiaoqikeji_class; static int xiaoqikeji_open(struct inode inode, struct file file) { /* GPIO7 8 9 10 输出高电平，/ GPIO21_0_DATA &= ~((1<<7)\|(1<<8)\|(1<<9)\|(1<<10)); return 0; } static void led (void) { unsigned int light; unsigned int k=0; while(k<3) { for(light=7;light<11;light++) { GPIO21_0_DATA \|= (1< mdelay(100); GPIO21_0_DATA &= ~(1< } k++; } } static long xiaoqikeji_unlocked_ioctl(struct file file, unsigned int cmd, unsigned long arg) { switch(cmd) { case 0: // 控制LED1 GPIO21_0_DATA ^= (0x01<<7); //与1异或取反与0异或保持 break; case 1: // 控制LED2 GPIO21_0_DATA ^= (0x01<<8); break; case 2: // 控制LED3 GPIO21_0_DATA ^= (0x01<<9); break; case 3: // 控制LED4 GPIO21_0_DATA ^= (0x01<<10); break; case 4: // 控制LED2-3 GPIO21_0_DATA ^= (0x03<<8); break; case 5: // 控制LED1 3 GPIO21_0_DATA ^= (0x05<<7); break; case 6: // 控制LED1-4 GPIO21_0_DATA ^= (0x0f<<7); break; case 7: // 执行led函数 led(); break; default: break; } return 0; } /* 1.分配、设置一个file_operations结构体 / static struct file_operations xiaoqikeji_fops = { .owner = THIS_MODULE, / 这是一个宏，推向编译模块时自动创建的__this_module变量 / .open = xiaoqikeji_open, .unlocked_ioctl = xiaoqikeji_unlocked_ioctl, }; int major; static int __init xiaoqikeji_init(void) { / 2.注册 / major = register_chrdev(0, "xiaoqikeji", &xiaoqikeji_fops); / 3.自动创建设备节点 / / 创建类 / xiaoqikeji_class = class_create(THIS_MODULE, "xiaoqikeji"); / 类下面创建设备节点 / device_create(xiaoqikeji_class, NULL, MKDEV(major, 0), NULL, "xiaoqikeji"); // /dev/xiaoqikeji / 4.硬件相关的操作 / / 映射寄存器的地址 / GPIOMODE = (volatile unsigned long )ioremap(0x10000060, 4); GPIO21_0_DIR = (volatile unsigned long )ioremap(0x10000624, 4); GPIO21_0_DATA = (volatile unsigned long )ioremap(0x10000620, 4); /* 设置相应管脚用于GPIO / / LED1 ---- GPIO#25 LED2 ---- GPIO#26 / GPIOMODE \|= (0x7<<2); /* 将GPIO#25、GPIO#26设置为输出 / GPIO21_0_DIR =(1<<7) \| (1<<8) \| (1<<9) \| (1<<10); return 0; } static void __exit xiaoqikeji_exit(void) { unregister_chrdev(major, "xiaoqikeji"); device_destroy(xiaoqikeji_class, MKDEV(major, 0)); class_destroy(xiaoqikeji_class); iounmap(GPIOMODE); iounmap(GPIO21_0_DIR); iounmap(GPIO21_0_DATA); } module_init(xiaoqikeji_init); //入口函数 module_exit(xiaoqikeji_exit); //出口函数 MODULE_LICENSE("GPL"); 如果人气很旺的话，我将考虑讲解这两部分代码 0
举报淘帖0 只看该作者相关推荐 • 创建一个简单Hello World Linux应用程序的过程 158 • 在ARM9开发板上实现一个简单的LED驱动程序 4934 • 实战Linux Socket编程 2047 • 基于Linux怎么提高Socket的性能？ 1220 • 基于Linux的Socket网络编程如何实现？ 1598 • 基于linux socket can程序的主要功能 2417 • Linux之本地Socket通信 2956 • linux socket代码 1782 • linux与android怎么socket通信 3064 • linux socket 问题 2033 1条评论发表评论只看该作者

nakedRunning · 2019-11-17 22:05:58 沙发您好，linux下可以直接操纵地址吗？我看您的驱动程序好像是直接对地址进行赋值呀

赞回复举报